唐山老震区40年地震时空演化特征分析

唐山老震区40年地震时空演化特征分析
张素欣;王晓山;陈婷;宫猛;单连君
【期刊名称】《华北地震科学》
【年(卷),期】2017(035)001
【摘要】基于唐山老震区40年的小震目录,利用传统的余震时序分析法,分析了余震序列的时间演化特征;依据强度分级原则,分析了不同强度的地震空间图像的时间演化特征.基于小震目录,分析了1996年以来的小震密集图像特征.参考多年来唐山地震的研究成果,对余震时空演化特征与构造关系进行了深入分析.结果表明:1976年唐山7.8级地震的余震序列,随着时间推移,其地震强度逐步减弱,地震频度逐渐降低;余震强度的起伏明显,主震发生后36年仍有5.0级地震发生;地震空间分布图像在1 996年前后具有明显的差异分布特征.%On basis of small earthquake catalog in Tanshan old seismic region during the past 40 years,using classic aftershock sequence analysis method,we analyze the time evolution characteristics of the Tanshan great earthquake aftershock sequence,and then,based on the principles of intensity scale,we analyze the time evolution characteristics of earthquake space image with different intensity of earthquake.On basis of accurate relocated small earthquake catalog,we study the small earthquakes intensive image characteristics since
1996.Referring to the research results of the Tangshan earthquake during the past 40 years,we thoroughly analyze the relationship between the aftershocks space-time evolution characteristics and tectonic.The results indicate that the activity of 1976 Tangshan M7.8 great earthquake
aftershock sequence become weaker as time goes by,its intensity gradually diminished and its frequency is gradually lower,but the intensity fluctuation is obvious.There is still M5.0 earthquake occurred 36 years after the main shock,spatial distribution of seismic images have significant different characteristic before and after 1996.
【总页数】6页(P32-37)
【作者】张素欣;王晓山;陈婷;宫猛;单连君
【作者单位】河北省地震局,河北石家庄050021;河北省地震局,河北石家庄050021;河北省地震局,河北石家庄050021;河北省地震局,河北石家庄050021;河北省地震局,河北石家庄050021
【正文语种】中文
【中图分类】P315.2
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