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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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2022, 40(3): 1-7.
doi: 10.3969/j.issn.1003-1375.2022.03.001
[PDF 6058KB]
Abstract:
According to the needs of earthquake disaster information management system in Henan Province, the structure of earthquake disaster database is designed by using PowerDesigner software, the basic disaster information database is established, and the centralized control, management and sharing of data are realized. The design process and technical requirements of the database are described in detail, which can serve for "diversified and automated disaster data collection means and intelligent disaster data processing". Meanwhile, it can also provide reference for other disaster database construction and the application of PowerDesinger in database design.
According to the needs of earthquake disaster information management system in Henan Province, the structure of earthquake disaster database is designed by using PowerDesigner software, the basic disaster information database is established, and the centralized control, management and sharing of data are realized. The design process and technical requirements of the database are described in detail, which can serve for "diversified and automated disaster data collection means and intelligent disaster data processing". Meanwhile, it can also provide reference for other disaster database construction and the application of PowerDesinger in database design.
2022, 40(3): 8-15.
doi: 10.3969/j.issn.1003-1375.2022.03.002
Abstract:
This paper takes Xixia District of Yinchuan city as an example, using GIS to make spatial correlation between POI (points of interest) and road buffer, to identify various urban functional areas. By using mobile phone signaling data, the urban functional areas are matched with spatial distribution data of population, and the spatio-temporal distribution changes of population are calculated. On this basis, according to the principles of tolerance, accessibility and proximity, we re-plan urban earthquake emergency shelters, to solve the current unreasonable layout of emergency shelters. Based on the quantitative analysis of existing resources, two fixed emergency shelters are added, which can effectively alleviate the overload of emergency shelters and the contradiction between supply and demand when destructive earthquakes occur. The research results of this paper can provide new ideas and means for the service capacity analysis and scientific layout planning of urban earthquake emergency shelters.
This paper takes Xixia District of Yinchuan city as an example, using GIS to make spatial correlation between POI (points of interest) and road buffer, to identify various urban functional areas. By using mobile phone signaling data, the urban functional areas are matched with spatial distribution data of population, and the spatio-temporal distribution changes of population are calculated. On this basis, according to the principles of tolerance, accessibility and proximity, we re-plan urban earthquake emergency shelters, to solve the current unreasonable layout of emergency shelters. Based on the quantitative analysis of existing resources, two fixed emergency shelters are added, which can effectively alleviate the overload of emergency shelters and the contradiction between supply and demand when destructive earthquakes occur. The research results of this paper can provide new ideas and means for the service capacity analysis and scientific layout planning of urban earthquake emergency shelters.
2022, 40(3): 16-20.
doi: 10.3969/j.issn.1003-1375.2022.03.003
Abstract:
In view of the construction of knowledge map of public service for earthquake prevention and disaster reduction, this paper discusses the selection of construction methods, the construction of model layer, and the organization of data layer, and also discusses the related problems of knowledge map construction. The construction of public service knowledge map of earthquake prevention and disaster reduction plays an important technical support role in the construction of public service platform of earthquake prevention and disaster reduction and the realization of its intelligent construction goal.
In view of the construction of knowledge map of public service for earthquake prevention and disaster reduction, this paper discusses the selection of construction methods, the construction of model layer, and the organization of data layer, and also discusses the related problems of knowledge map construction. The construction of public service knowledge map of earthquake prevention and disaster reduction plays an important technical support role in the construction of public service platform of earthquake prevention and disaster reduction and the realization of its intelligent construction goal.
2022, 40(3): 21-26, 33.
doi: 10.3969/j.issn.1003-1375.2022.03.004
Abstract:
By using remote sensing images and empirical estimation, the types and numbers of buildings in the station area of Yingkou city, the center city of Liaodong Bay, were counted, and the results showed that the seismic capacity of this area was good as a whole, and the main deficiency of seismic capacity was the villages in the city and the villages in the suburbs in the process of rapid urbanization. The research results may provide reliable data support for seismic capability evaluation of local buildings.
By using remote sensing images and empirical estimation, the types and numbers of buildings in the station area of Yingkou city, the center city of Liaodong Bay, were counted, and the results showed that the seismic capacity of this area was good as a whole, and the main deficiency of seismic capacity was the villages in the city and the villages in the suburbs in the process of rapid urbanization. The research results may provide reliable data support for seismic capability evaluation of local buildings.
2022, 40(3): 27-33.
doi: 10.3969/j.issn.1003-1375.2022.03.005
Abstract:
With the goal of minimizing the total evacuation distance, this article develops a P-median model suitable for the location-allocation optimization of earthquake and typhoon disasters. An heuristic algorithm was applied to derive solutions. Moreover, the population configuration gap for each shelter was calculated in different scenarios. An empirical study was carried out in Rongcheng of Shandong Province as an example. The results show that: From only using earthquake type, only using typhoon type to using all shelters at the same time, 61, 125 and 158 shelters were selected respectively. The average number of residential sites served by a single shelter was 15.79, 7.70 and 6.09, respectively. The average distance of shelter was 3 790.24 m, 2 905.34 m and 2 300.02 m, respectively. The spatial distribution of shelters is extremely uneven, and the areas with large population configuration gaps are mainly concentrated in the northern and southern regions. Therefore, short-term and long-term planning and construction goals are recommended which can provide a certain decision-making basis for the planning of disaster shelters in Rongcheng City.
With the goal of minimizing the total evacuation distance, this article develops a P-median model suitable for the location-allocation optimization of earthquake and typhoon disasters. An heuristic algorithm was applied to derive solutions. Moreover, the population configuration gap for each shelter was calculated in different scenarios. An empirical study was carried out in Rongcheng of Shandong Province as an example. The results show that: From only using earthquake type, only using typhoon type to using all shelters at the same time, 61, 125 and 158 shelters were selected respectively. The average number of residential sites served by a single shelter was 15.79, 7.70 and 6.09, respectively. The average distance of shelter was 3 790.24 m, 2 905.34 m and 2 300.02 m, respectively. The spatial distribution of shelters is extremely uneven, and the areas with large population configuration gaps are mainly concentrated in the northern and southern regions. Therefore, short-term and long-term planning and construction goals are recommended which can provide a certain decision-making basis for the planning of disaster shelters in Rongcheng City.
2022, 40(3): 34-39.
doi: 10.3969/j.issn.1003-1375.2022.03.006
Abstract:
Xingtai area has a history of frequent earthquakes, and the western mountainous area has poor economic conditions and many geological disasters. In order to obtain the seismic situation of rural houses in this area, a field survey was conducted in this area, and the survey was carried out from village to household in the form of sampling. Through field investigation, the seismic performance and hidden danger of earthquake damage of rural houses in this area are obtained, and the relationship between seismic performance of buildings and economy, population and traffic is obtained. Based on the survey results, some countermeasures and suggestions are given to improve the seismic performance of local houses.
Xingtai area has a history of frequent earthquakes, and the western mountainous area has poor economic conditions and many geological disasters. In order to obtain the seismic situation of rural houses in this area, a field survey was conducted in this area, and the survey was carried out from village to household in the form of sampling. Through field investigation, the seismic performance and hidden danger of earthquake damage of rural houses in this area are obtained, and the relationship between seismic performance of buildings and economy, population and traffic is obtained. Based on the survey results, some countermeasures and suggestions are given to improve the seismic performance of local houses.
2022, 40(3): 40-49.
doi: 10.3969/j.issn.1003-1375.2022.03.007
Abstract:
The travel time of P-wave seismic phase is obtained using a 500 km long high-resolution seismic wide-angle reflection/refraction detection profile across the western edge of Ordos Basin, Yinchuan graben, Yellow River fault zone and Helan Mountain piedmont fault in the central and western part of North China Craton, and the one-dimensional crustal velocity structure model in this area is obtained by several calculation methods. The results show that the crustal velocity structure and the stratification of the inner crust interface between the Yinchuan Basin and its two sides are highly different. The Yinchuan Basin and its western section present a three-layer crustal structure. The C2 interface exists in the west of the Ordos block merely. The crustal structure shows a double-layer feature, and the variation of the inner crust velocity isoline and interface is relatively gentle, exhibiting the stable crustal structure; Along the seismic sounding section, the crustal thickness generally presents the characteristics of gradually thickening from east to west, and each block has its crustal thickness characteristics. The differences in basement structure and deep structure between Yinchuan graben and adjacent blocks are analyzed with the research results of other geophysical and geological data in this area, and their transverse differences and structural deformation characteristics in different areas are discussed. The result provides fine geophysical parameters for the in-depth understanding of the spatial differences between the central and western parts of the North China Craton and the deep/shallow structural characteristics of the weak structural belt or active structural belt.
The travel time of P-wave seismic phase is obtained using a 500 km long high-resolution seismic wide-angle reflection/refraction detection profile across the western edge of Ordos Basin, Yinchuan graben, Yellow River fault zone and Helan Mountain piedmont fault in the central and western part of North China Craton, and the one-dimensional crustal velocity structure model in this area is obtained by several calculation methods. The results show that the crustal velocity structure and the stratification of the inner crust interface between the Yinchuan Basin and its two sides are highly different. The Yinchuan Basin and its western section present a three-layer crustal structure. The C2 interface exists in the west of the Ordos block merely. The crustal structure shows a double-layer feature, and the variation of the inner crust velocity isoline and interface is relatively gentle, exhibiting the stable crustal structure; Along the seismic sounding section, the crustal thickness generally presents the characteristics of gradually thickening from east to west, and each block has its crustal thickness characteristics. The differences in basement structure and deep structure between Yinchuan graben and adjacent blocks are analyzed with the research results of other geophysical and geological data in this area, and their transverse differences and structural deformation characteristics in different areas are discussed. The result provides fine geophysical parameters for the in-depth understanding of the spatial differences between the central and western parts of the North China Craton and the deep/shallow structural characteristics of the weak structural belt or active structural belt.
2022, 40(3): 50-54.
doi: 10.3969/j.issn.1003-1375.2022.03.008
Abstract:
In this paper, the characteristics of equatorial dipole device with small dipole distance in geo-resistivity observation are studied from the two aspects of the influence coefficients and signal strength in different strata in the observation area. The results show that compared with the symmetrical quadrupole device: ① For the underlying low-resistance structure, the small dipole device is beneficial to suppress the shallow interference and obtain the lower stratum resistivity changes, ② For the underlying high resistivity structure, the ability of the small dipole device to suppress shallow interference is close to that of the symmetrical quadrupole device, but the ability to acquire resistivity changes in the lower stratum is obviously better than that of the symmetrical quadrupole device, ③ For the uniform structure, the small dipole device is obviously superior to the symmetrical quadrupole device in suppressing the shallow interference, and the ability to obtain the resistivity changes of the lower stratum is close to that of the symmetric quadrupole device, ④ The signal strength of the small dipole devices is significantly lower than that of the symmetrical quadrupole device regardless of the type of resistivity structure, however, the signal strength of the small dipole device is sufficient for observation under the technical level of the existing observation instruments.
In this paper, the characteristics of equatorial dipole device with small dipole distance in geo-resistivity observation are studied from the two aspects of the influence coefficients and signal strength in different strata in the observation area. The results show that compared with the symmetrical quadrupole device: ① For the underlying low-resistance structure, the small dipole device is beneficial to suppress the shallow interference and obtain the lower stratum resistivity changes, ② For the underlying high resistivity structure, the ability of the small dipole device to suppress shallow interference is close to that of the symmetrical quadrupole device, but the ability to acquire resistivity changes in the lower stratum is obviously better than that of the symmetrical quadrupole device, ③ For the uniform structure, the small dipole device is obviously superior to the symmetrical quadrupole device in suppressing the shallow interference, and the ability to obtain the resistivity changes of the lower stratum is close to that of the symmetric quadrupole device, ④ The signal strength of the small dipole devices is significantly lower than that of the symmetrical quadrupole device regardless of the type of resistivity structure, however, the signal strength of the small dipole device is sufficient for observation under the technical level of the existing observation instruments.
2022, 40(3): 55-61.
doi: 10.3969/j.issn.1003-1375.2022.03.009
Abstract:
Through the field test method, G856T proton precession magnetometer is used to measure ferromagnetic substances of different mass at selected points in the field, and ferromagnetic substances of the same mass are placed at points in different directions in the field. GM4 fluxgate magnetometer is used to measure their interference with geomagnetic fields D, H and Z, combined with the typical examples of ferromagnetic substances interference in Tianjin regional geomagnetic station in recent years, the influence of ferromagnetic materials on geomagnetic observation is studied. The results show that: ① The measured results of the interference of ferromagnetic materials on geomagnetic observation are close to the theoretical calculated values in amplitude, and the deviation may be related to the magnetic inhomogeneity of underground media in the test site and the material, shape and volume of ferromagnetic materials. ② The greater the mass of ferromagnetic material, the wider the influence range of geomagnetic observation. The magnetic field gradient near ferromagnetic material is large, and the isoline becomes dense, and vice versa. ③ The interference amplitude and form of ferromagnetic substances on geomagnetic fields D, H and Z have certain rules in direction, which can be used as the basis for judging the orientation of ferromagnetic interference sources.
Through the field test method, G856T proton precession magnetometer is used to measure ferromagnetic substances of different mass at selected points in the field, and ferromagnetic substances of the same mass are placed at points in different directions in the field. GM4 fluxgate magnetometer is used to measure their interference with geomagnetic fields D, H and Z, combined with the typical examples of ferromagnetic substances interference in Tianjin regional geomagnetic station in recent years, the influence of ferromagnetic materials on geomagnetic observation is studied. The results show that: ① The measured results of the interference of ferromagnetic materials on geomagnetic observation are close to the theoretical calculated values in amplitude, and the deviation may be related to the magnetic inhomogeneity of underground media in the test site and the material, shape and volume of ferromagnetic materials. ② The greater the mass of ferromagnetic material, the wider the influence range of geomagnetic observation. The magnetic field gradient near ferromagnetic material is large, and the isoline becomes dense, and vice versa. ③ The interference amplitude and form of ferromagnetic substances on geomagnetic fields D, H and Z have certain rules in direction, which can be used as the basis for judging the orientation of ferromagnetic interference sources.
2022, 40(3): 62-68.
doi: 10.3969/j.issn.1003-1375.2022.03.010
Abstract:
Based on the Power Spectral Density (PSD) analysis method, the power spectral density characteristics of typical tilt observation data in Inner Mongolia, which on normal time or affected by gale, rainfall, barometric pressure and seismic wave is analyzed. The results show that: under the normal background, the daily PSD results are basically the same, and the second sampling data can obtain 8.3 mHz ~ 0.5 Hz high frequency information more than the minute sampling data; the gale interference affects frequency bands greater than 10−3 Hz, and causes significant increase in the energy of the second kind of ground pulsation noise signal to the second sampling data; the rainfall interference mainly affects the frequency band lower than 10−4 Hz, and also affects the 0.01 ~ 0.10 Hz frequency band of second sampling data; the barometric interference affects the 10−4 ~ 10−3 Hz and 0.01 ~ 0.10 Hz frequency band, and also may cause significant increase in the energy of the second kind of ground pulsation noise signal to the second sampling data; the frequency range and noise amplitude affected by seismic wave are directly proportional to the maximum amplitude and duration of seismic waves recorded by observation instruments. Moreover, in the affected frequency band, the background noise of the four kinds of interference signals is significantly higher than that in the quiet day.
Based on the Power Spectral Density (PSD) analysis method, the power spectral density characteristics of typical tilt observation data in Inner Mongolia, which on normal time or affected by gale, rainfall, barometric pressure and seismic wave is analyzed. The results show that: under the normal background, the daily PSD results are basically the same, and the second sampling data can obtain 8.3 mHz ~ 0.5 Hz high frequency information more than the minute sampling data; the gale interference affects frequency bands greater than 10−3 Hz, and causes significant increase in the energy of the second kind of ground pulsation noise signal to the second sampling data; the rainfall interference mainly affects the frequency band lower than 10−4 Hz, and also affects the 0.01 ~ 0.10 Hz frequency band of second sampling data; the barometric interference affects the 10−4 ~ 10−3 Hz and 0.01 ~ 0.10 Hz frequency band, and also may cause significant increase in the energy of the second kind of ground pulsation noise signal to the second sampling data; the frequency range and noise amplitude affected by seismic wave are directly proportional to the maximum amplitude and duration of seismic waves recorded by observation instruments. Moreover, in the affected frequency band, the background noise of the four kinds of interference signals is significantly higher than that in the quiet day.
2022, 40(3): 69-75.
doi: 10.3969/j.issn.1003-1375.2022.03.011
Abstract:
Several abnormal changes of water temperature in Shahe observation well have been recorded since the observation. In order to explore the causes, FFT and S transformation methods are used to analyze the observed data. It is found that there is a good correspondence between the abnormal data changes and the microearthquakes within the range of 5km and the medium-strong earthquakes within the range of 200 km of the nearby faults in the next three months, indicating that the water temperature observation of the well has a good pre-earthquake abnormal response characteristics. The results show that the low frequency wave and diurnal tide are the main causes of the abnormal water temperature data. In addition, the diurnal tide has a significant influence on the data in the process of accelerated change before multiple earthquakes and after rapid change, and even appears the diurnal tide shape, which can be taken as one of the indicators to determine the abnormal water temperature data of the well.
Several abnormal changes of water temperature in Shahe observation well have been recorded since the observation. In order to explore the causes, FFT and S transformation methods are used to analyze the observed data. It is found that there is a good correspondence between the abnormal data changes and the microearthquakes within the range of 5km and the medium-strong earthquakes within the range of 200 km of the nearby faults in the next three months, indicating that the water temperature observation of the well has a good pre-earthquake abnormal response characteristics. The results show that the low frequency wave and diurnal tide are the main causes of the abnormal water temperature data. In addition, the diurnal tide has a significant influence on the data in the process of accelerated change before multiple earthquakes and after rapid change, and even appears the diurnal tide shape, which can be taken as one of the indicators to determine the abnormal water temperature data of the well.
2022, 40(3): 76-82.
doi: 10.3969/j.issn.1003-1375.2022.03.012
Abstract:
This paper studies the observation data of different borehole strain gauges in the same site at Yixian Station, analyze the reliability of the four-component borehole strain and its correlation with body strain, and then analyze the response of different borehole strain observations to special events. The result shows that: 1) The 4-component borehole strain observation at Yixian Station is not very self-consistent and requires field relative calibration; when performing relative calibration, the selection of difference value data is beneficial to improve the reliability of the data; 2) The Pearson correlation coefficient of S1+S3 and body strain is slightly higher than that of S2+S4 and body strain; 3) In terms of response to special events, the volume strain and the four-component borehole strain show tensile changes due to pumping disturbance, and the variation is higher than the volume strain. The correlation coefficient between volume strain and S1+S3 is higher than volume strain and S2+S4. In terms of co-seismic response, the co-seismic response of different borehole strains is consistent, and the correlation coefficient is related to the magnitude of the earthquake.
This paper studies the observation data of different borehole strain gauges in the same site at Yixian Station, analyze the reliability of the four-component borehole strain and its correlation with body strain, and then analyze the response of different borehole strain observations to special events. The result shows that: 1) The 4-component borehole strain observation at Yixian Station is not very self-consistent and requires field relative calibration; when performing relative calibration, the selection of difference value data is beneficial to improve the reliability of the data; 2) The Pearson correlation coefficient of S1+S3 and body strain is slightly higher than that of S2+S4 and body strain; 3) In terms of response to special events, the volume strain and the four-component borehole strain show tensile changes due to pumping disturbance, and the variation is higher than the volume strain. The correlation coefficient between volume strain and S1+S3 is higher than volume strain and S2+S4. In terms of co-seismic response, the co-seismic response of different borehole strains is consistent, and the correlation coefficient is related to the magnitude of the earthquake.
2022, 40(3): 83-86, 99.
doi: 10.3969/j.issn.1003-1375.2022.03.013
Abstract:
The coseismic response characteristics recorded by Putian gPhone gravimeter and VP wide-band tiltmeter were compared and analyzed. The results show that: (1)The delay time of coseismic response was negatively correlated with magnitude and positively correlated with epicentral distance. The variation of coseismic response duration and amplitude mainly depends on magnitude, but not necessarily related to epicentral distance;(2) The number of coseismic events recorded by gravimeter was more than that recorded by broadband tiltmeter. From the characteristics of coseismic response, such as duration of coseismic response, amplitude change and so on, the recording ability of gravimeter was better than that of broadband tiltmeter, but there was no difference in the delay time of coseismic response between gravimeter and broadband tiltmeter.
The coseismic response characteristics recorded by Putian gPhone gravimeter and VP wide-band tiltmeter were compared and analyzed. The results show that: (1)The delay time of coseismic response was negatively correlated with magnitude and positively correlated with epicentral distance. The variation of coseismic response duration and amplitude mainly depends on magnitude, but not necessarily related to epicentral distance;(2) The number of coseismic events recorded by gravimeter was more than that recorded by broadband tiltmeter. From the characteristics of coseismic response, such as duration of coseismic response, amplitude change and so on, the recording ability of gravimeter was better than that of broadband tiltmeter, but there was no difference in the delay time of coseismic response between gravimeter and broadband tiltmeter.
2022, 40(3): 87-92.
doi: 10.3969/j.issn.1003-1375.2022.03.014
Abstract:
The formation mechanism and influencing factors of water temperature microdynamic are studied by analyzing the observation data of water level and water temperature in Keshiketeng well for many years. The results show that the water temperature of the well shows a dynamic change of high in winter and low in summer, and shows a downward trend year by year. The unique dynamic of the water temperature of the well is different from the impact of typical rainfall recharge. The change of water temperature is not synchronized with the change of water level and precipitation recharge time. It is considered that the atmospheric precipitation recharge area far away from the well and the long residence time of hot water in the aquifer are the possible reasons for the non-synchronization between water temperature dynamics and rainfall recharge. It is reasonable to use the lag effect of rainfall recharge and geothermal dynamics to explain the microdynamic change of water temperature in the well.
The formation mechanism and influencing factors of water temperature microdynamic are studied by analyzing the observation data of water level and water temperature in Keshiketeng well for many years. The results show that the water temperature of the well shows a dynamic change of high in winter and low in summer, and shows a downward trend year by year. The unique dynamic of the water temperature of the well is different from the impact of typical rainfall recharge. The change of water temperature is not synchronized with the change of water level and precipitation recharge time. It is considered that the atmospheric precipitation recharge area far away from the well and the long residence time of hot water in the aquifer are the possible reasons for the non-synchronization between water temperature dynamics and rainfall recharge. It is reasonable to use the lag effect of rainfall recharge and geothermal dynamics to explain the microdynamic change of water temperature in the well.
2022, 40(3): 93-99.
doi: 10.3969/j.issn.1003-1375.2022.03.015
Abstract:
The starting magnitude of b-value spatial scanning is selected to scan and analyze b-value space before medium-strong earthquakes in inland Fujian province. The results show that before most medium-strong earthquakes, there will be b-value spatial scanning anomaly at or near the epicenter, and the b-value anomaly lasts until the onset of most moderate and strong earthquakes, and the duration of the anomaly is related to the number of medium-strong earthquakes within the anomaly range of 1 ~ 2 years. In general, the more medium-strong earthquakes occur in the anomaly range, the longer the duration of the anomaly before the earthquake.
The starting magnitude of b-value spatial scanning is selected to scan and analyze b-value space before medium-strong earthquakes in inland Fujian province. The results show that before most medium-strong earthquakes, there will be b-value spatial scanning anomaly at or near the epicenter, and the b-value anomaly lasts until the onset of most moderate and strong earthquakes, and the duration of the anomaly is related to the number of medium-strong earthquakes within the anomaly range of 1 ~ 2 years. In general, the more medium-strong earthquakes occur in the anomaly range, the longer the duration of the anomaly before the earthquake.
2022, 40(3): 100-104.
doi: 10.3969/j.issn.1003-1375.2022.03.016
Abstract:
According to the local earthquake magnitude formula, this paper uses the station base noise value to inversely calculate the minimum magnitude of the epicenter distance to calculate the current monitoring capacity of the Guangxi seismic network. Through calculation, it is obtained that the regional seismic monitoring capacity of Guangxi basically reaches ML1.4. The monitoring capability of the provincial junction basically reached ML1.6, and the Beibu Gulf area reached ML1.8. After the completion of the "the 12th Five-Year Plan" project in Guangxi, the earthquake monitoring capacity of Guangxi will reach ML1.2. The minimum integrity magnitude (EMR) method is used to calculate the earthquake catalog of Guangxi and neighboring areas from 2008 to 2020, and the regional minimum integrity magnitude MC value is ML1.7, which is 0.1 level larger than the calculated by using the station noise value under the same seismic catalogin station conditions. It shows that the regional seismic monitoring capability obtained from the calculation of base noise can truly reflect the current monitoring capability.
According to the local earthquake magnitude formula, this paper uses the station base noise value to inversely calculate the minimum magnitude of the epicenter distance to calculate the current monitoring capacity of the Guangxi seismic network. Through calculation, it is obtained that the regional seismic monitoring capacity of Guangxi basically reaches ML1.4. The monitoring capability of the provincial junction basically reached ML1.6, and the Beibu Gulf area reached ML1.8. After the completion of the "the 12th Five-Year Plan" project in Guangxi, the earthquake monitoring capacity of Guangxi will reach ML1.2. The minimum integrity magnitude (EMR) method is used to calculate the earthquake catalog of Guangxi and neighboring areas from 2008 to 2020, and the regional minimum integrity magnitude MC value is ML1.7, which is 0.1 level larger than the calculated by using the station noise value under the same seismic catalogin station conditions. It shows that the regional seismic monitoring capability obtained from the calculation of base noise can truly reflect the current monitoring capability.
2020, 38(3): 1-5.
doi: 10.3969/j.issn.1003-1375.2020.03.001
2021, 39(4): 1-7.
doi: 10.3969/j.issn.1003-1375.2021.04.001
2020, 38(2): 40-44.
doi: 10.3969/j.issn.1003-1375.2020.02.007
2021, 39(3): 58-65.
doi: 10.3969/j.issn.1003-1375.2021.03.009
2019, 37(4): 7-12.
doi: 10.3969/j.issn.1003-1375.2019.04.002
2020, 38(S2): 140-143.
doi: 10.3969/j.issn.1003-1375.2020.S2.022
2020, 38(S1): 86-89.
doi: 10.3969/j.issn.1003-1375.2020.S1.019
2022, 40(3): 55-61.
doi: 10.3969/j.issn.1003-1375.2022.03.009
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