三维分块倾斜界面的反演及其应用
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摘要
介绍了利用反射波走时反演介质层速度和包含直立断层的三维界面的计算方法.对各层界面利用多个倾斜或平界面方程来描述.给出了数值计算实例.结果表明,反演解与真模型很接近,说明计算方法是有效的.利用该方法处理了唐山地震区的PmP反射波资料,获得了该区域莫霍界面的三维分块形态.唐山附近莫霍界面错断与该区域1976年唐山地震及一系列余震的发生有密切的联系.
A calculating method for inversing body wave velocities and three dimensional structure of interfaces by using reflected wave travel time is presented.A fast 3 D ray tracing algorithm by Chander and a damped least squares technique are used to solve forward and inversion problems respectively.The result shows that the solutions of inversion are close quite to the true model.A 3 D Moho interface structure in Tangshan earthquake region is constructed using P mP reflected wave data.The faults of Moho interface in Tangshan area and its vicinity are relative to the Tangshan main earthquakes and a series of aftershocks in 1976.
引文
1WiliamsonPR.Tomographicinversioninreflectionseismology.GeophysJInt,1990,(100):255~274.2FarraVandMadarigeK.Nolinearreflectiontomography.GeophysJ,1987,(95):135~147.3赖晓玲,张先康,杨健.二维反射地震成象———界面与速度的联合反演.华北地震科学,1994,12(4):9~17.4KanasewichERandChiuSKL.Leastsquaresinversionofspatialseismicrefractiondata.BulSeisSocAm,1985,(75):865~880.5ChanderR.Ontracingseismicrayswithspecifiedendpointsinlayersofconstantvelocityandplaneinterfaces.GeophysProsp,1977,(25):120~124.6王德人.非线性方程组解法与最优化方法.北京:人民教育出版社,1979.7刘昌铨,喜世旭.唐山地区地壳上地幔结构特征.地震学报,1986,8(4):341~353.8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,1988,31(4):383~398.9曾融生,张少泉,周海南,何正勤.唐山地震的地壳结构及大陆地震成因的探讨.地震学报,1985,7(2):125~142.10国家地震局《一九七六年唐山地震》编辑组.一九七六年唐山地震.北京:地震出版社,198

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