用近震资料反演京津唐地区的地壳三维速度结构

丁志峰; 曾融生

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用近震资料反演京津唐地区的地壳三维速度结构

丁志峰, 曾融生

文章导航 > 华北地震科学 > 1994 > 12(2): 14-20

丁志峰, 曾融生. 用近震资料反演京津唐地区的地壳三维速度结构[J]. 华北地震科学, 1994, 12(2): 14-20.

引用本文:

丁志峰, 曾融生. 用近震资料反演京津唐地区的地壳三维速度结构[J]. 华北地震科学, 1994, 12(2): 14-20.

Ding Zhifeng, Zeng Rongsheng. THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA[J]. North China Earthquake Sciences, 1994, 12(2): 14-20.

Citation:

Ding Zhifeng, Zeng Rongsheng. THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA[J]. North China Earthquake Sciences, 1994, 12(2): 14-20.

用近震资料反演京津唐地区的地壳三维速度结构

国家地震局地球物理研究所, 北京 100081

详细信息

中图分类号: P631.4

THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA

Institute of Geophysics, SSB, Beijing 100081

摘要: 用近震资料能得到在水平向和垂直向分辨率较高的地壳速度结构。计算过程中,分别进行定位和速度结构反演的运算,叠代求解。利用北京电信传输台网的资料,用ACH方法对发生在该地区的147个地震进行定位。根据P波和Pn波的走时数据,用SIRT方法反演地壳的三维速度结构。SIRT方法具有物理意义清晰、计算速度快的特点,在微机上即可实现大数据量的反演计算。数值模拟结果显示,SIRT方法的反演结果也是比较理想的。为反演京津唐地区的地壳结构,将研究区域分为三层,各层又划分为13×13个均匀块体,用147个地震的3310条P波和Pn波走时数据反演各块体的速度值。计算结果表明,在地壳上部,速度分布变化不大;中部的平原地区速度低,山区速度高;在北京和唐山之间的地壳下部则明显地存在一低速区,它和远震资料得到的上地幔低速区的位置吻合,表明地幔深部物质向上的侵入,影响了华北地区的地震活动。
- 京津唐地区 /
- SIRT方法 /
- 地壳 /
- 三维速度结构反演
Abstract: The better resolution in horizontal and vertical compenents for the crustal velocity structure can be obtained by using local earthquake data. For events occurred in Beijing, Tianjin and Tangshan area, the earthquake location and velocity structure inversion were calculated iteratedly. 147 earthquakes occurred in this area were relocated with ACH algorithm by using the data from Beijing Telemetered Seismic Network. Using SIRT algorithm, the crustal 3D velocity structure was inversed from the P and Pn arrival times. The SIRT algorithm is characteristic of clear physical meaning and fast calculation. The inversion with a large amount of data can be done in PC micro-computer. The results of digital modeling show that the SIRT algorithm is desirable.In order to inverse the crustal structure of Beijing-Tianjin-Tangshan area, we divided the crust into three layers, and divided each layer into 13×13 homogeneous blocks. The velocity values of the blocks were inversed by 3310 P and Pn arrival times of 147 earthquakes. The inrersion results indicate that: (1) the velocities vary slightly in the upper crust; (2) for middle layer of the crust, the velocities are lowre in the plain and higher in the mountain area, and (3) there is a low velocity zone between Beijing and Tangshan in the lower crust. The low velocity zone in the lower crust is coincident with the position of upper mantle low velocity zone obtained by teleseismic data. It means that there have been material intrusion from deeper mantle, which affects the seismicity in North China.
- Beijing /
- Tianjin and Tangshan area /
- SIRT algorithm /
- crust

[1]

l 丁志峰,曾融生.京津唐地区震源深度分布初探.地震学报, 1990,11 (3):244-249
2 金安蜀,刘福田,孙永智.北京地区地亮和上地领三维P波速度结构.地球物理学报. 1980,23:172-182
3 刘福田,曲克信,吴华,李强,刘建华,胡戈.华北地区的地震层面成象.地球物理学报, 1986,29:442-449.
4 曾融生,张少泉,周海南,何正勤.唐山地震区的地壳结构及大陆地震成困的探讨.地震学报, 1985,7:125-142
5 曾融生,陆涵行,丁志峰.从地震折射和反射剖面结果讨论唐山地震成因.地球物理学报, 1985,31:383-398
6 朱露培,曾融生,刘福田.京津唐张地区地壳上地幌三维P波速度结构.地球物理学报, 1990,33 (3):267-277
7 Aki,k.,and W. H. K. Lee,1976,Determination of three-dimensional velocity anomalies under a seismic array using first P-arrival times from local earthquakes,1,A homogeneous initial model,J. Geophys. Res.,81 (23), 4381-4399.
8 Aki,K.,1977,Three-dimensional seismic velocity anomalies in the lithosphere,J. Geophts.,43,235-242.
9 Dines,K. A. and R. J. Lytle,1979,Computerized geophysical tomography,Proc. IEEE,67,1065-1073
10 McMechan,G. A.,etc.,1987,Crosshole tomography for strongly variable media with applications to scale model data,Bull. Seism. Soc. Am.,77,1945-1960.
11 Shedlock,K. M.,S. W. Roecker,1987,Elastic wave velocity structure of the crust and upper mantle beneath the north China basin,J. G. R.,92 (B9),9327-9350.

[1]	王帅军, 王夫运, 张成科, 黄灿, 杨雅琼, 齐浪. 北京及附近地区地壳速度结构与构造 . 华北地震科学, 2011, 29(2): 6-12.
[2]	李冬圣, 刘继录. 2009年华北及河北省地震活动概况 . 华北地震科学, 2010, 28(2): 63-63.
[3]	胡中民, 王夫运, 刘明军, 花鑫升, 邓晓华. 用Pg波走时反演首都圈地区的上地壳速度结构 . 华北地震科学, 2008, 26(2): 1-6.
[4]	张成科, 张先康, 张建狮. 大同-阳高震区深部构造背景 . 华北地震科学, 1999, 17(1): 1-8.
[5]	石琳珂. 利用重力资料研究地壳分层结构的遗传反演方法 . 华北地震科学, 1997, 15(4): 10-17.
[6]	赖晓玲, 张先康, 杨玉春, 杨健. Pg回折波的上地壳三维层析成象 . 华北地震科学, 1996, 14(3): 10-19.
[7]	石琳珂. 改进的地壳速度结构遗传反演方法 . 华北地震科学, 1996, 14(2): 22-28,41.
[8]	白来旺, 侯廷爱. 山西裂谷系的深部地球物理探测 . 华北地震科学, 1994, 12(3): 27-35.
[9]	陈立华, 林楚贞. 京津唐地区体波震相特征和分区平均地壳模型的研究 . 华北地震科学, 1987, 5(1): 104-110.
[10]	孙继忠. 赤峰南部地区弱震活动是唐滦强震孕育和发生的窗口 . 华北地震科学, 1985, 3(4): 93-98.

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用近震资料反演京津唐地区的地壳三维速度结构

国家地震局地球物理研究所, 北京 100081

收稿日期: 1992-11-13
刊出日期: 1994-06-15

中图分类号: P631.4

关键词:

京津唐地区 /

SIRT方法 /

地壳 /

三维速度结构反演

摘要: 用近震资料能得到在水平向和垂直向分辨率较高的地壳速度结构。计算过程中,分别进行定位和速度结构反演的运算,叠代求解。利用北京电信传输台网的资料,用ACH方法对发生在该地区的147个地震进行定位。根据P波和Pn波的走时数据,用SIRT方法反演地壳的三维速度结构。SIRT方法具有物理意义清晰、计算速度快的特点,在微机上即可实现大数据量的反演计算。数值模拟结果显示,SIRT方法的反演结果也是比较理想的。为反演京津唐地区的地壳结构,将研究区域分为三层,各层又划分为13×13个均匀块体,用147个地震的3310条P波和Pn波走时数据反演各块体的速度值。计算结果表明,在地壳上部,速度分布变化不大;中部的平原地区速度低,山区速度高;在北京和唐山之间的地壳下部则明显地存在一低速区,它和远震资料得到的上地幔低速区的位置吻合,表明地幔深部物质向上的侵入,影响了华北地区的地震活动。

English Abstract

THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA

Institute of Geophysics, SSB, Beijing 100081

Received Date: 1992-11-13
Publish Date: 1994-06-15

Keywords:

Abstract: The better resolution in horizontal and vertical compenents for the crustal velocity structure can be obtained by using local earthquake data. For events occurred in Beijing, Tianjin and Tangshan area, the earthquake location and velocity structure inversion were calculated iteratedly. 147 earthquakes occurred in this area were relocated with ACH algorithm by using the data from Beijing Telemetered Seismic Network. Using SIRT algorithm, the crustal 3D velocity structure was inversed from the P and Pn arrival times. The SIRT algorithm is characteristic of clear physical meaning and fast calculation. The inversion with a large amount of data can be done in PC micro-computer. The results of digital modeling show that the SIRT algorithm is desirable.In order to inverse the crustal structure of Beijing-Tianjin-Tangshan area, we divided the crust into three layers, and divided each layer into 13×13 homogeneous blocks. The velocity values of the blocks were inversed by 3310 P and Pn arrival times of 147 earthquakes. The inrersion results indicate that: (1) the velocities vary slightly in the upper crust; (2) for middle layer of the crust, the velocities are lowre in the plain and higher in the mountain area, and (3) there is a low velocity zone between Beijing and Tangshan in the lower crust. The low velocity zone in the lower crust is coincident with the position of upper mantle low velocity zone obtained by teleseismic data. It means that there have been material intrusion from deeper mantle, which affects the seismicity in North China.

丁志峰, 曾融生. 用近震资料反演京津唐地区的地壳三维速度结构[J]. 华北地震科学, 1994, 12(2): 14-20.

引用本文:

丁志峰, 曾融生. 用近震资料反演京津唐地区的地壳三维速度结构[J]. 华北地震科学, 1994, 12(2): 14-20.

Ding Zhifeng, Zeng Rongsheng. THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA[J]. North China Earthquake Sciences, 1994, 12(2): 14-20.

Citation:

Ding Zhifeng, Zeng Rongsheng. THE 3D VELOCITY STRUCTURE INVERSION IN BEIJING-TIANJIN-TANGSHAN AREA BY USING LOCAL EARTHQUAKE DATA[J]. North China Earthquake Sciences, 1994, 12(2): 14-20.