首都圈中强震前后视应力时空演化过程研究*

地震 ›› 2016, Vol. 36 ›› Issue (2): 119-131.

首都圈中强震前后视应力时空演化过程研究^*

岳晓媛¹, 武安绪¹, 冯刚¹, 李红¹, 武敏捷¹, 李腊月²

1.北京市地震局,北京 100080;
2.中国地震局第一监测中心,天津 300180

收稿日期:2015-07-30 修回日期:2015-10-22 出版日期:2016-04-30 发布日期:2020-07-06
作者简介:岳晓媛(1981-),女,辽宁兴城人,工程师,主要从事地震活动性、数字地震等研究工作。
基金资助:
北京市地震局科技项目青年专项资助

Temporal-spatial Evolution of Apparent Stresses before Moderate-strong Earthquakes in the Capital Circle Area of China

YUE Xiao-yuan, WU An-xu, FENG Gang, LI Hong, WU Min-jie

Earthquake Adminstration of Beijing Municipality,Beijing 100080,China

Received:2015-07-30 Revised:2015-10-22 Online:2016-04-30 Published:2020-07-06

摘要/Abstract

摘要： 选用首都圈数字遥测地震台网地震波形资料,利用近震源Brune模式计算首都圈地区2002年至今M_L≥2.0地震的视应力值,探讨了震源参数的标度关系,最终选取2.0≤M_L≤2.9地震对首都圈地区2002年以来中强地震前视应力的时空异常变化特征进行详细分析。研究结果表明:首都圈中强地震前,多次地震出现显著的视应力高值异常,且地震多发生在视应力高值异常区域附近。同时与波速比计算结果进行了对比分析,印证了异常存在具有一定的客观性。由此可见,分析识别首都圈地区的应力状态可以为该地区中强震的危险性提供判定依据。

关键词: 视应力时空变化, 高值异常, 首都圈地区

Abstract: Using the near-source Brune model,we calculate apparent stresses of M_L≥2.0 earthquakes occurred in the capital area of China since 2002using seismic waveform data recorded by the Capital Circle Digital Seismic Network.We discussed scaling relations of source parameters,and choose the 2.0≤ M_L≤2.9earthquakes to analyze and discuss anomalous variation characteristics in time and space before medium-strong earthquakes. The results show that apparent stresses have an obvious high value anomaly before many medium-strong earthquakes,and the earthquakes occurred 82.0 24.3 at high value anomaly area.It can be seen that apparent stress state of can provide evidence for seismic risk analysis in the capital region.

Key words: Apparent stresses, Anomaly characteristics, Space-time varivation, The capital circle area of China

中图分类号:

P315.7

岳晓媛, 武安绪, 冯刚, 李红, 武敏捷, 李腊月. 首都圈中强震前后视应力时空演化过程研究^*[J]. 地震, 2016, 36(2): 119-131.

YUE Xiao-yuan, WU An-xu, FENG Gang, LI Hong, WU Min-jie. Temporal-spatial Evolution of Apparent Stresses before Moderate-strong Earthquakes in the Capital Circle Area of China[J]. EARTHQUAKE, 2016, 36(2): 119-131.

参考文献

[1]Choy G L,Boatwright J L.Global patterns of radiated seismic energy and apparent stress[J].J Geophys Res,1995,100:18 205-18 288.
[2]吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293-301.
[3]陈学忠,许向彤,翟文杰.1995年7月20日河北沙城ML4.1级地震序列破裂过程中应力变化的研究[J].地震学报,2005,27(3):276-281.
[4]王琼,陈学忠,王林瑛.岫岩地震序列视应力变化及其预测意义[J].地震,2005,25(02):91-97.
[5]刘红桂,刘杰,丁页岭,等.地震视应力在云南地震序列中的前兆特征[J].地震学报,2006,28(5):462-471.
[6]李艳娥,陈学忠.1999年11月29日岫岩5.4级地震序列震源参数测定及标度关系分析[J].地震,2007,27(4):59-67.
[7]曹凤娟,尹涛,马丽.岫岩MS5.4地震前后视应力时空变化特征[J].东北地震研究,2005,21(1):14-19.
[8]陈学忠,李艳娥.2006年7月4日河北文安MS5.1地震前震中周围的地区小震视应力随时间的变化[J].中国地震,2007,23(4):327-336.
[9]李艳娥,陈学忠,王恒信.汶川8.0级地震前四川地区地震视应力时空变化特征[J].地震,2012,32(4):113-122.
[10]黄显良,刘东旺,沈小七,等.华东地区视应力场的研究[J].地震地磁观测与研究,2005,26(6):29-32.
[11]秦嘉政,钱晓东.云南地区地震视应力的时间和空间分布研究[J].地震学报,2006,28(3):221-229.
[12]梁向军,李丽,宋美琴.山西地区视应力时空变化特征分析[J].中国地震,2014,30(1):102-110.
[13]Brune J N.Tectonic stress and the spectra of seismic waves from earthquakes[J].J Geophys Res,1970,75:4 997-5 009.
[14]Aki K,Richards P G.Quantitarive Seismology,Theory and Methods[M].Freeman &Company San Francisco,California.1980.
[15]Andrews D J.Objective determination of source parameters and similarity of earthquakes of different size[A].In:Das S,Boatwright J and Scholz C H(eds),Earthquake Source Mechanics.Washington [C].D.C.:AGU,1986,259-267.
[16]Snoke J A.Stable determination of(Brune)stress drops[J].Bull Seism Soc Am,1987,77(2):530-538.
[17]Archuleta R,Cranswick E,Mueller C,et al.Source parameters of the 1980Mammoth Lakes,California, earthquakes sequence[J].J Geophys Res,1982,87:4 595-4 607.
[18]Wyss M.Apparent stresses of earthquakes on ridges compared to apparent stresses of earthquakes in trenches[J].Geophys J R astr Soc,1970,19:479-484.
[19]张国民,傅征祥,桂燮泰,等.地震预报引论[M].地震科学出版社,2001.
[20]李善邦. 中国地震[M].北京:地震出版社,1981.
[21]王晓山,刁桂苓,冯向东,等.2006年文安地震孕育、发生的应力场动态图像[J].地震研究,2011,34(3):266-270.
[22]薛艳,周龙泉,马宏生,等.利用小震重新定位结果研究河北文安地震前地震活动三维空间特征[J].地震,2010,30(1):10-19.
[23]陈学忠,王小平,王林瑛,等.地震视应力应用与震后趋势快速判定的可能性[J].国际地震动态,2003,7:1-4
[24]Wu Z L.Scaling of apparent stress from broadband radiated energy catalogue and seismic moment catalogue and its focal mechanism dependence[J].Earth Planets Space,2001,53(10):943-948.
[25]易桂喜,闻学泽,辛华,等.龙门山断裂带南段应力状态与强震危险性研究[J].地球物理学报,2013,56(4):1 112-1 120.