由多个地震震源机制解求福建东南沿海地区平均应力场
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摘要
基于震源断层面的空间取向和滑动方向,写出力轴张量在地理坐标系中的表达式,进而给出计算平均力轴张量及主值的方法,即通过求解相应的本征方程得到。对使用多个震源机制解中T,B,P轴参数计算平均应力场的正确性,以许忠淮用滑动方向拟合法反演富蕴、唐山地区平均应力场数据进行计算和验证。选择具有地震构造意义地块或地震带内大量地震的震源机制解研究区域平均应力场。根据福建东南沿海地区47次主要地震的震源机制解,给出了该区应力张量的定量分析结果。该方法物理意义明确,使由大量地震震源机制解资料分析构造应力场的方法走向定量化,并为定量探索区域应力场的整体动态变化成为可能。
Based on the space tropism and slip direction of source fault plane, it was written that the expression of force axis tensor in geographical coordinate system, so given the method of calculating average force axis tensor and main value., i.e., to get the solution by corresponding eigen equation. It was tested the validity of calculating average stress field using T,B,P axis parameters in multi-focal mechanism solution. According to the focal mechanism solutios of 47 earthquakes in Fujian southeastern inshore, it was given that the quantitative analysis results of the average stress field in the research region.
Based on the space tropism and slip direction of source fault plane, it was written that the expression of force axis tensor in geographical coordinate system, so given the method of calculating average force axis tensor and main value., i.e., to get the solution by corresponding eigen equation. It was tested the validity of calculating average stress field using T,B,P axis parameters in multi-focal mechanism solution. According to the focal mechanism solutios of 47 earthquakes in Fujian southeastern inshore, it was given that the quantitative analysis results of the average stress field in the research region.
引文
Gephart,J.W.and.Forsyth.,D.W.,1984..Ani mproved methodfor determiningthe regional stresstensor using earthquake focal mechanism data:applicafion to the San Fernand earthquake sequence,J.Geo-phys.Res.89,9305-9320.
Ellsworth.W.L.,and X.Zhonghuai,1980.Determination of the stress tensor fromfocal mechanismdata.Eos Trans.AGU.61:1117.
许忠淮,1985.用滑动方向拟合法反演唐山余震区的平均应力场,地震学报,7(4):349-361.
许忠淮,戈澍谟,1984.用滑动方向拟合法反演富蕴地震断裂带应力场,地震学报,(6):395-404.
Aki,K.and Richards,P.G.,1980.Quantitative seismology.Theory and methods.李钦祖等译,定量地震学理论和方法第1卷,地震出版社,116-131.
数学手册编写组,2002.数学手册.北京:高等教育出版社,88～89.
丁祥焕等,1999.福建东南沿海活动断裂与地震.福州:福建科学技术出版社,201～210.
Ellsworth.W.L.,and X.Zhonghuai,1980.Determination of the stress tensor fromfocal mechanismdata.Eos Trans.AGU.61:1117.
许忠淮,1985.用滑动方向拟合法反演唐山余震区的平均应力场,地震学报,7(4):349-361.
许忠淮,戈澍谟,1984.用滑动方向拟合法反演富蕴地震断裂带应力场,地震学报,(6):395-404.
Aki,K.and Richards,P.G.,1980.Quantitative seismology.Theory and methods.李钦祖等译,定量地震学理论和方法第1卷,地震出版社,116-131.
数学手册编写组,2002.数学手册.北京:高等教育出版社,88～89.
丁祥焕等,1999.福建东南沿海活动断裂与地震.福州:福建科学技术出版社,201～210.
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