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North China Earthquake Sciences
- Supervisor：Hebei Earthquake Administration
- Chief Editor：Dai Bosheng
- Address：Shijiazhuang City, Hebei Province
- ISSN：1003-1375
- CN：13-1102/P
- Sponsor：Hebei Earthquake Administration
- Language：Chinese
Articles in press have been peer-reviewed and accepted, which are not yet assigned to volumes /issues, but are citable by Digital Object Identifier (DOI).
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2023, 41(3): 1-7.
doi: 10.3969/j.issn.1003-1375.2023.03.001
Abstract:
In order to improve the processing efficiency of non-natural earthquake events, optimize the display of geographical information and reduce the burden of the personnel on duty, the author designed a platform for dealing with non-natural earthquake events. which is based on SpringBoot, Baidu Maps and POI technology. By analyzing the quick report information, the platform calls the template to output the event report. With Baidu map, the epicenter and the geographical location of stations, historical earthquakes and mining enterprises within the setting range around the epicenter are indentified. The distance from the above areas to the epicenter and other relevant information are calculated. It also provides data management, query and map display services for stations, historical earthquakes and mining enterprises. The development of this platform has solved the problems of long report production cycle, inconvenient data query, and no visual way to display geographic information. It can provide support for earthquake emergency services.
In order to improve the processing efficiency of non-natural earthquake events, optimize the display of geographical information and reduce the burden of the personnel on duty, the author designed a platform for dealing with non-natural earthquake events. which is based on SpringBoot, Baidu Maps and POI technology. By analyzing the quick report information, the platform calls the template to output the event report. With Baidu map, the epicenter and the geographical location of stations, historical earthquakes and mining enterprises within the setting range around the epicenter are indentified. The distance from the above areas to the epicenter and other relevant information are calculated. It also provides data management, query and map display services for stations, historical earthquakes and mining enterprises. The development of this platform has solved the problems of long report production cycle, inconvenient data query, and no visual way to display geographic information. It can provide support for earthquake emergency services.
2023, 41(3): 8-14.
doi: 10.3969/j.issn.1003-1375.2023.03.002
Abstract:
Based on the research of emergency decision-making needs, a set of thematic maps of earthquake emergency information for emergency command and its visualization scheme were discussed and formed. In order to improve the timeliness of the output of thematic maps of earthquake emergency information after earthquakes, the mapping data of earthquake emergency thematic maps involves administrative divisions which usually requires preprocessing such as zoning, blocking, and thinning before use. The corresponding visualization scheme are provided according to different service objects and service content, combined with the map significance, map content, cartographic elements of each thematic map of earthquake emergency information. The thematic map of earthquake emergency information and its visualization scheme for emergency command are aimed at achieving effective expression of earthquake emergency information, providing technical support for emergency command and minimizing casualties during earthquakes.
Based on the research of emergency decision-making needs, a set of thematic maps of earthquake emergency information for emergency command and its visualization scheme were discussed and formed. In order to improve the timeliness of the output of thematic maps of earthquake emergency information after earthquakes, the mapping data of earthquake emergency thematic maps involves administrative divisions which usually requires preprocessing such as zoning, blocking, and thinning before use. The corresponding visualization scheme are provided according to different service objects and service content, combined with the map significance, map content, cartographic elements of each thematic map of earthquake emergency information. The thematic map of earthquake emergency information and its visualization scheme for emergency command are aimed at achieving effective expression of earthquake emergency information, providing technical support for emergency command and minimizing casualties during earthquakes.
2023, 41(3): 15-21.
doi: 10.3969/j.issn.1003-1375.2023.03.003
Abstract:
Based on the seismic hazard risk survey and geological hazards survey in Chuxiong Yi Autonomous Prefecture, the ArcGIS spatial analysis and mathematical statistics were used, the relationship between the seismicity and the development of geological hazards is discussed from the aspects of seismic geological hazards, seismic intensity, seismicity and the evolution of geological hazards after earthquakes. The results show that the main geological hazards triggered by earthquake are landslide, collapse and ground fissure, especially in the high intensity or low intensity crossing area of the earthquakes above magnitude 6. The earthquakes below magnitude 6 can not trigger the geological disasters or trigger the geological hazards to a lesser extent, but they can promote the development of geological hazards. After the earthquake, geological hazards have long-term activity. The magnitude 6.5 earthquake in Wuding County led to sustained geological disaster activity for 23 years, while the magnitude 6.2 and 6.1 earthquakes in Dayao County led to sustained geological disaster activity for 18 years. In future post-earthquake reconstruction in Chuxiong Yi Autonomous Prefecture, full consideration should be given to the long-term activity characteristics of post-earthquake geological hazards in order to avoid loss of life and property.
Based on the seismic hazard risk survey and geological hazards survey in Chuxiong Yi Autonomous Prefecture, the ArcGIS spatial analysis and mathematical statistics were used, the relationship between the seismicity and the development of geological hazards is discussed from the aspects of seismic geological hazards, seismic intensity, seismicity and the evolution of geological hazards after earthquakes. The results show that the main geological hazards triggered by earthquake are landslide, collapse and ground fissure, especially in the high intensity or low intensity crossing area of the earthquakes above magnitude 6. The earthquakes below magnitude 6 can not trigger the geological disasters or trigger the geological hazards to a lesser extent, but they can promote the development of geological hazards. After the earthquake, geological hazards have long-term activity. The magnitude 6.5 earthquake in Wuding County led to sustained geological disaster activity for 23 years, while the magnitude 6.2 and 6.1 earthquakes in Dayao County led to sustained geological disaster activity for 18 years. In future post-earthquake reconstruction in Chuxiong Yi Autonomous Prefecture, full consideration should be given to the long-term activity characteristics of post-earthquake geological hazards in order to avoid loss of life and property.
Regional Structural Characteristics and Stability Evaluation of NamNgum 4 Hydropower Station in Laos
2023, 41(3): 22-27.
doi: 10.3969/j.issn.1003-1375.2023.03.004
Abstract:
Nam Ngum 4 hydropower Station is located on the Nam Ngum River in Laos. It is a large (2) type RCC gravity dam. The height of the maximum dam is 74m, the length of the maximum dam is 228m, and the total installed capacity is 240MW. The engineering area crosses the junction of the East Indochinese plate and the West Indochinese plate, forming a very complex tectonic pattern. We analyzed the tectonic background, the main tectonic fault zone activity and seismic activity characteristics. The results show that there is no seismic record of magnitude 7 or above in the hydropower station engineering area, the structural activity is weak, the engineering area is in a relatively stable tectonic block, and the regional structural stability is generally good.
Nam Ngum 4 hydropower Station is located on the Nam Ngum River in Laos. It is a large (2) type RCC gravity dam. The height of the maximum dam is 74m, the length of the maximum dam is 228m, and the total installed capacity is 240MW. The engineering area crosses the junction of the East Indochinese plate and the West Indochinese plate, forming a very complex tectonic pattern. We analyzed the tectonic background, the main tectonic fault zone activity and seismic activity characteristics. The results show that there is no seismic record of magnitude 7 or above in the hydropower station engineering area, the structural activity is weak, the engineering area is in a relatively stable tectonic block, and the regional structural stability is generally good.
2023, 41(3): 28-35.
doi: 10.3969/j.issn.1003-1375.2023.03.005
Abstract:
As an emerging active remote sensing technology, ground-based 3D laser scanner is gradually applied to various fields such as surveying, and it is the main way to obtain ground target data with the advantages of high accuracy and high efficiency, but the coordinate system of LiDAR point cloud data acquired by it exists randomly relative to the internal coordinate system of the instrument system. In order to solve the problem of coordinate system conversion in quantitative analysis of seismic damage information of building LiDAR point cloud data, this paper establishes an origin coordinate system conversion method based on three-dimensional coordinate system conversion matrix for LiDAR point cloud data extracted by filtering, denoising and segmentation of building independent walls. Comparing the conversion results with the results of the instrument supporting software, we verifies that the results of the coordinate system conversion algorithm coincide with the horizontal line in the X-axis direction and are better than the software conversion results. The establishment of the method in this paper reduces the human error factor in the data processing, improves the precision and accuracy of the coordinate system conversion of foundation LiDAR point cloud data, improves the efficiency of post-earthquake LiDAR point cloud data processing and analysis of buildings, and lays the theoretical foundation and technical support for the later quantitative analysis and determination of building damage information.
As an emerging active remote sensing technology, ground-based 3D laser scanner is gradually applied to various fields such as surveying, and it is the main way to obtain ground target data with the advantages of high accuracy and high efficiency, but the coordinate system of LiDAR point cloud data acquired by it exists randomly relative to the internal coordinate system of the instrument system. In order to solve the problem of coordinate system conversion in quantitative analysis of seismic damage information of building LiDAR point cloud data, this paper establishes an origin coordinate system conversion method based on three-dimensional coordinate system conversion matrix for LiDAR point cloud data extracted by filtering, denoising and segmentation of building independent walls. Comparing the conversion results with the results of the instrument supporting software, we verifies that the results of the coordinate system conversion algorithm coincide with the horizontal line in the X-axis direction and are better than the software conversion results. The establishment of the method in this paper reduces the human error factor in the data processing, improves the precision and accuracy of the coordinate system conversion of foundation LiDAR point cloud data, improves the efficiency of post-earthquake LiDAR point cloud data processing and analysis of buildings, and lays the theoretical foundation and technical support for the later quantitative analysis and determination of building damage information.
2023, 41(3): 36-42.
doi: 10.3969/j.issn.1003-1375.2023.03.006
Abstract:
Although cable tray supports are simple in structure, their seismic analysis calculations are still time-consuming. In order to get an assessment method that can evaluate cable bridges quickly and instantaneously, this study simplifies the S2 type supports vibration problem into a cantilever beam vibration model with mass points at the end. According to the structural characteristics of the supports, we investigates its influence on the participation coefficient and vibration pattern of the cantilever beam in terms of the size and position of the mass points in the cantilever beam. The results show that the cantilever beam with mass point at the end is suitable for assessing the self-vibration frequency and bending stress of the cable bridge, and the results are compared with the reaction spectrum analysis method and the seismic identification test results, and the results are in good agreement. The cantilever beam model with mass points at the end can characterize the vibration of type S2 supports, which can meet the immediate assessment of type S2 cable supports, provide empirical support for project site designers, give quick design advice, and can also be used as a basis for preliminary design.
Although cable tray supports are simple in structure, their seismic analysis calculations are still time-consuming. In order to get an assessment method that can evaluate cable bridges quickly and instantaneously, this study simplifies the S2 type supports vibration problem into a cantilever beam vibration model with mass points at the end. According to the structural characteristics of the supports, we investigates its influence on the participation coefficient and vibration pattern of the cantilever beam in terms of the size and position of the mass points in the cantilever beam. The results show that the cantilever beam with mass point at the end is suitable for assessing the self-vibration frequency and bending stress of the cable bridge, and the results are compared with the reaction spectrum analysis method and the seismic identification test results, and the results are in good agreement. The cantilever beam model with mass points at the end can characterize the vibration of type S2 supports, which can meet the immediate assessment of type S2 cable supports, provide empirical support for project site designers, give quick design advice, and can also be used as a basis for preliminary design.
2023, 41(3): 43-51.
doi: 10.3969/j.issn.1003-1375.2023.03.007
Abstract:
This paper is based on the earthquake events issued by the early warning system since the trial operation. The processing records of JEEW and EEW processing systems were counted and analyzed respectively, the results are as follows: ① the first report time of JEEW system is less than 10 seconds. The mean magnitude deviation was 0.69. The deviations of epicentral distance were all within 10 kilometers, and the deviations within 5 kilometers accounted for 89.36% . The first report time of EEW system within 10 seconds accounted for 64.7%, the mean magnitude deviation was 0.6, and the deviations of epicentral distance within 10 kilometers accounted for 76.47%. ② For the earthquake events with magnitude ≥ M3.0, the results of the JEEW system show that the first alarm time is 4~6 s, the magnitude deviation is 0.3~0.6, and the epicenter location deviation is 0.7~3.5 km. The result of EEW system shows that the first alarm takes 3~8 s, the magnitude deviation is 0.0~0.6, and the epicenter location deviation is 1~5.2 km. Therefore, the seismic event warning time in this magnitude range is short and the location result is relatively accurate.
This paper is based on the earthquake events issued by the early warning system since the trial operation. The processing records of JEEW and EEW processing systems were counted and analyzed respectively, the results are as follows: ① the first report time of JEEW system is less than 10 seconds. The mean magnitude deviation was 0.69. The deviations of epicentral distance were all within 10 kilometers, and the deviations within 5 kilometers accounted for 89.36% . The first report time of EEW system within 10 seconds accounted for 64.7%, the mean magnitude deviation was 0.6, and the deviations of epicentral distance within 10 kilometers accounted for 76.47%. ② For the earthquake events with magnitude ≥ M3.0, the results of the JEEW system show that the first alarm time is 4~6 s, the magnitude deviation is 0.3~0.6, and the epicenter location deviation is 0.7~3.5 km. The result of EEW system shows that the first alarm takes 3~8 s, the magnitude deviation is 0.0~0.6, and the epicenter location deviation is 1~5.2 km. Therefore, the seismic event warning time in this magnitude range is short and the location result is relatively accurate.
2023, 41(3): 52-59.
doi: 10.3969/j.issn.1003-1375.2023.03.008
Abstract:
In the process of geoelectric observation, the data are easily disturbed by by leakage and observation system fault, such as sudden jump, step, out-of-tolerance and so on. These interference data is difficult to judged quickly, and need a lot of inspection work to complete. The instrument can record the working state and the change of the geoelectric field in real time. When there is interference, the second data or minute data of the corresponding interference period can be retrieved, and the interference can be identified through numerical analysis, thus eliminating the abnormality and improving the efficiency of interference data troubleshooting.
In the process of geoelectric observation, the data are easily disturbed by by leakage and observation system fault, such as sudden jump, step, out-of-tolerance and so on. These interference data is difficult to judged quickly, and need a lot of inspection work to complete. The instrument can record the working state and the change of the geoelectric field in real time. When there is interference, the second data or minute data of the corresponding interference period can be retrieved, and the interference can be identified through numerical analysis, thus eliminating the abnormality and improving the efficiency of interference data troubleshooting.
2023, 41(3): 60-66.
doi: 10.3969/j.issn.1003-1375.2023.03.009
Abstract:
The Pingshan MS4.3 earthquake occurred in a weak earthquake area on October 3, 2022. It is the largest earthquake within 50 km of the periphery since 1970. In order to quantitatively analyze the variation of seismic activity before the Pingshan MS4.3 earthquake, We improved the “Region-Time-Length” (RTL) algorithm, increased the weight of the seismic events close to the node in distance and time, and decreased the weight of seismic events that are far away from the node in distance and time. We used the improved RTL algorithm to scan the\begin{document}$ {V_{\rm{RTL} }} $\end{document} ![]()
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The Pingshan MS4.3 earthquake occurred in a weak earthquake area on October 3, 2022. It is the largest earthquake within 50 km of the periphery since 1970. In order to quantitatively analyze the variation of seismic activity before the Pingshan MS4.3 earthquake, We improved the “Region-Time-Length” (RTL) algorithm, increased the weight of the seismic events close to the node in distance and time, and decreased the weight of seismic events that are far away from the node in distance and time. We used the improved RTL algorithm to scan the
2023, 41(3): 67-73.
doi: 10.3969/j.issn.1003-1375.2023.03.010
Abstract:
In this paper, we picked out repeating earthquakes based on cross-correlation technology in Xunwu and its adjacent areas, and then detected the variations of crustal media by using coda wave interferometry method during repeating earthquakes. The results show that the linear trend of delay time in early S wave coda of most repeating earthquake pairs are very obvious, which reflects the wave velocity change of crustal media. The two repeating earthquake doublets in the south of Xunwu Station have the most obvious changes in wave velocity, the wave velocity variation relatively far away from stations is small. The area with obvious wave velocity change is consistent with the low b value area and the seismically active area.
In this paper, we picked out repeating earthquakes based on cross-correlation technology in Xunwu and its adjacent areas, and then detected the variations of crustal media by using coda wave interferometry method during repeating earthquakes. The results show that the linear trend of delay time in early S wave coda of most repeating earthquake pairs are very obvious, which reflects the wave velocity change of crustal media. The two repeating earthquake doublets in the south of Xunwu Station have the most obvious changes in wave velocity, the wave velocity variation relatively far away from stations is small. The area with obvious wave velocity change is consistent with the low b value area and the seismically active area.
2023, 41(3): 74-79.
doi: 10.3969/j.issn.1003-1375.2023.03.011
Abstract:
The co-seismic response characteristics of the well water level in Fanxian County to the large teleseismic earthquakes are counted. Their response time, response amplitude, and response form are analyzed one by one. The mechanism of co-seismic response is discussed, and the rules are summarized. The results show that the observation well has a good ability to reflect earthquakes. The higher the earthquake magnitude, the observation well has the better ability to reflect earthquakes. From the perspective of the response amplitude, the co-seismic response between Ms6.5 and Ms7.5 earthquakes has obvious advantages, and the performance of continental earthquakes is better than that of non-continental earthquakes. Under certain conditions, the focal depth has a great influence on both the response time and the response amplitude. The co-seismic well water level response forms are not single, including impulse type, oscillation type and oscillation impulse type, and the response forms are related to the epicenter distance.
The co-seismic response characteristics of the well water level in Fanxian County to the large teleseismic earthquakes are counted. Their response time, response amplitude, and response form are analyzed one by one. The mechanism of co-seismic response is discussed, and the rules are summarized. The results show that the observation well has a good ability to reflect earthquakes. The higher the earthquake magnitude, the observation well has the better ability to reflect earthquakes. From the perspective of the response amplitude, the co-seismic response between Ms6.5 and Ms7.5 earthquakes has obvious advantages, and the performance of continental earthquakes is better than that of non-continental earthquakes. Under certain conditions, the focal depth has a great influence on both the response time and the response amplitude. The co-seismic well water level response forms are not single, including impulse type, oscillation type and oscillation impulse type, and the response forms are related to the epicenter distance.
2023, 41(3): 80-90.
doi: 10.3969/j.issn.1003-1375.2023.03.012
Abstract:
Due to the complex record form and difficulty in type recognition of seismic events in the Changzhi area of Shanxi Province, this paper takes the ML 2.8 earthquake that occurred at the junction of Xiangyuan and Lucheng in Changzhi, Shanxi on December 15, 2019 as an example to analyze the source characteristics of the Xiangyuan-Lucheng earthquake from the aspects of structural environment, spectrum characteristics, source parameters, rupture mechanism, simultaneous seismic activity and on-site investigation. The results show that the Xiangyuan-Lucheng earthquake has the characteristics of relatively low frequency distribution, low stress drop, and large rupture scale compared with earthquakes in the same region, and the source depth is at the depth of the high-low velocity conversion layer. It has a generally consistent main stress axis direction with four ML≥3.0 seismic activities that occurred intensively in the same region later, and it is also close to the direction of the high principal stress in the NNE direction shown by the existing media in the source area. Therefore, this study believes that the Xiangyuan-Lucheng earthquake was an earthquake induced by the regional stress enhancement superimposed on the local existing NNE high principal stress, which was induced in the mining area. This may be related to the fracturing of water injection in the mining area, which lubricates the fault section in the source area and reduces the friction coefficient, and the small stress change in the region activates the pre-existing fault.
Due to the complex record form and difficulty in type recognition of seismic events in the Changzhi area of Shanxi Province, this paper takes the ML 2.8 earthquake that occurred at the junction of Xiangyuan and Lucheng in Changzhi, Shanxi on December 15, 2019 as an example to analyze the source characteristics of the Xiangyuan-Lucheng earthquake from the aspects of structural environment, spectrum characteristics, source parameters, rupture mechanism, simultaneous seismic activity and on-site investigation. The results show that the Xiangyuan-Lucheng earthquake has the characteristics of relatively low frequency distribution, low stress drop, and large rupture scale compared with earthquakes in the same region, and the source depth is at the depth of the high-low velocity conversion layer. It has a generally consistent main stress axis direction with four ML≥3.0 seismic activities that occurred intensively in the same region later, and it is also close to the direction of the high principal stress in the NNE direction shown by the existing media in the source area. Therefore, this study believes that the Xiangyuan-Lucheng earthquake was an earthquake induced by the regional stress enhancement superimposed on the local existing NNE high principal stress, which was induced in the mining area. This may be related to the fracturing of water injection in the mining area, which lubricates the fault section in the source area and reduces the friction coefficient, and the small stress change in the region activates the pre-existing fault.
2023, 41(3): 91-96.
doi: 10.3969/j.issn.1003-1375.2023.03.013
Abstract:
Based on the classification of the geoelectric field, the ET of geoelectric field of Xingji seismic station is extracted at the time when the space electromagnetic environment is calm and the daily deformation of the geoelectric field is stable. Then, the total ET of the geoelectric field is synthesized by using the orthogonal two-channel geoelectrical field. The azimuth variation of the total geoelectrical field is analyzed: the azimuth angle is calculated and the scatter plot is drawn. The azimuth of the geoelectric field in Xingji Seismic Station is more discrete than that in Pingliang and Dabaisha. Tha data does not have the characteristics of three-stage steady-state variation. Harmonic fitting was used to analyze the harmonics of the electric field data of Xingji, Pingliang, Dabaishe and Changli stations. The differences of harmonic components of these stations were analyzed by harmonic fitting degree and f-test, furthermore, the reason of the instability of the azimuth data before and after noon in geoelectric field of Xingji sataion is analyzed. The low fitting degree of the first 10 order harmonics and the obvious high order harmonics in Xingji Seismic Station geoelectric field indicate that the complex composition of the field in Xingji Seismic Station may be the cause of the dispersion of the azimuth data of the geoelectric field in a day. Finally, it provides a reference for understanding the composition and extraction of the geoelectric field.
Based on the classification of the geoelectric field, the ET of geoelectric field of Xingji seismic station is extracted at the time when the space electromagnetic environment is calm and the daily deformation of the geoelectric field is stable. Then, the total ET of the geoelectric field is synthesized by using the orthogonal two-channel geoelectrical field. The azimuth variation of the total geoelectrical field is analyzed: the azimuth angle is calculated and the scatter plot is drawn. The azimuth of the geoelectric field in Xingji Seismic Station is more discrete than that in Pingliang and Dabaisha. Tha data does not have the characteristics of three-stage steady-state variation. Harmonic fitting was used to analyze the harmonics of the electric field data of Xingji, Pingliang, Dabaishe and Changli stations. The differences of harmonic components of these stations were analyzed by harmonic fitting degree and f-test, furthermore, the reason of the instability of the azimuth data before and after noon in geoelectric field of Xingji sataion is analyzed. The low fitting degree of the first 10 order harmonics and the obvious high order harmonics in Xingji Seismic Station geoelectric field indicate that the complex composition of the field in Xingji Seismic Station may be the cause of the dispersion of the azimuth data of the geoelectric field in a day. Finally, it provides a reference for understanding the composition and extraction of the geoelectric field.
2023, 41(3): 97-100.
doi: 10.3969/j.issn.1003-1375.2023.03.014
Abstract:
In order to extract the effective prediction index for moderate-strong earthquakes in the northwestern margin of Ordos block, small earthquake activity windows of different magnitudes and ranges are analyzed in Yinchuan area, a seismic window with predictive significance is selected by calculating the R value and molchan test. The results show that the seismic activity of ML4 Yinchuan window has a good indication for earthquakes with magnitude ~ 6 in the northwestern margin of the Ordos block. When the annual frequency of ML3 seismic activity of the Yinchuan seismic window is greater than 2, it has a good indication for the occurrence of earthquakes with magnitude greater than or equal to 5 in the northwestern margin of the Ordos block in the next year.
In order to extract the effective prediction index for moderate-strong earthquakes in the northwestern margin of Ordos block, small earthquake activity windows of different magnitudes and ranges are analyzed in Yinchuan area, a seismic window with predictive significance is selected by calculating the R value and molchan test. The results show that the seismic activity of ML4 Yinchuan window has a good indication for earthquakes with magnitude ~ 6 in the northwestern margin of the Ordos block. When the annual frequency of ML3 seismic activity of the Yinchuan seismic window is greater than 2, it has a good indication for the occurrence of earthquakes with magnitude greater than or equal to 5 in the northwestern margin of the Ordos block in the next year.
2023, 41(3): 101-107.
doi: 10.3969/j.issn.1003-1375.2023.03.015
Abstract:
The NS direction of tensometer of Zhangjiakou fixed-point deformation observation site has accelerated rising anomaly from June to December 2020. In view of this anomaly, we take Zhangjiakou fixed-point deformation observation site as the research area, based on sentinel-1 SAR descending imaging and small baseline subset (SBAS) technology for InSAR time series analysis. we obtains the vertical annual average deformation rate and deformation time series in this area from 2018 to 2020. The results show that the vertical relative movement rate of the surface on both sides of Zhangjiakou fault is less than 1 mm/a, and the fault activity is weak. Under the action of NNW-SSE tensile stress, the southern side surface of Zhangjiakou fault appears obvious subsidence movement relative to the northern side, this is the reason why the observation curves of the NS component of tensometer in Zhangjiakou seismic station showed the abnormal change of tensile acceleration trend.
The NS direction of tensometer of Zhangjiakou fixed-point deformation observation site has accelerated rising anomaly from June to December 2020. In view of this anomaly, we take Zhangjiakou fixed-point deformation observation site as the research area, based on sentinel-1 SAR descending imaging and small baseline subset (SBAS) technology for InSAR time series analysis. we obtains the vertical annual average deformation rate and deformation time series in this area from 2018 to 2020. The results show that the vertical relative movement rate of the surface on both sides of Zhangjiakou fault is less than 1 mm/a, and the fault activity is weak. Under the action of NNW-SSE tensile stress, the southern side surface of Zhangjiakou fault appears obvious subsidence movement relative to the northern side, this is the reason why the observation curves of the NS component of tensometer in Zhangjiakou seismic station showed the abnormal change of tensile acceleration trend.
2023, 41(3): 108-112.
doi: 10.3969/j.issn.1003-1375.2023.03.016
Abstract:
The paper takes the overall national security concept of "Promoting the Modernization of National Security System and Capabilities" as the guiding ideology, and takes "Safety First, Prevention First" and "Establishing A Major Safety and Emergency Framework" as the fundamental direction and guide of earthquake prevention and disaster reduction work in the new era and new journey. Summarize the current development status of earthquake warning work in China, deeply analyze the opportunities and challenges faced by the earthquake warning work in the new era and new journey, and explore new ideas and methods for the construction of the earthquake warning mechanism in the future new era and new journey.
The paper takes the overall national security concept of "Promoting the Modernization of National Security System and Capabilities" as the guiding ideology, and takes "Safety First, Prevention First" and "Establishing A Major Safety and Emergency Framework" as the fundamental direction and guide of earthquake prevention and disaster reduction work in the new era and new journey. Summarize the current development status of earthquake warning work in China, deeply analyze the opportunities and challenges faced by the earthquake warning work in the new era and new journey, and explore new ideas and methods for the construction of the earthquake warning mechanism in the future new era and new journey.
2020, 38(3): 1-5.
doi: 10.3969/j.issn.1003-1375.2020.03.001
2021, 39(3): 58-65.
doi: 10.3969/j.issn.1003-1375.2021.03.009
2020, 38(2): 40-44.
doi: 10.3969/j.issn.1003-1375.2020.02.007
2022, 40(4): 95-99.
doi: 10.3969/j.issn.1003-1375.2022.04.014
2020, 38(S1): 86-89.
doi: 10.3969/j.issn.1003-1375.2020.S1.019
2020, 38(S2): 140-143.
doi: 10.3969/j.issn.1003-1375.2020.S2.022
2023, 41(2): 37-42.
doi: 10.3969/j.issn.1003-1375.2023.02.006
2023, 41(2): 75-80.
doi: 10.3969/j.issn.1003-1375.2023.02.011
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