1976年唐山地震发震断裂的活动性研究
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摘要
震后野外考察及航空摄影发现的地裂缝带，说明唐山断裂与１９７６年唐山７．８级大地震的发震构造有密切关系。用卫星遥感信息和浅层地震勘探结果对唐山断裂的活动性做了新的研究。卫星图像解释结果表明：震前一年多时间内，ＮＥ向的唐山断裂被ＮＮＷ向断裂截切而ＮＷＷ向断裂受到牵引，因而显示出右旋走滑的活动形迹。浅层地震勘探结果则证明，唐山断裂是倾向ＮＷ，高倾角的右旋走滑正断层，它断错了全新统（Ｑ４）、晚更新统（Ｑ３）、中更新统（Ｑ２）和早更新统（Ｑ１）地层。
A ground fissure zone was found by field observation and aerial survey after the Tangshan M 7.8 earthquake of 1976. It indicates that the Tangshan fault is associated with the seismogenic structure of the event. We have made a new study to the activity of this fault by using the information of the satellite remote sensing and the results of seismic exploration to the shallow layers. Explanations of the satellite pictures show that the NE trending Tangshan fault was cut by the NNW trending fault,while the fault of NWW strike was trailed,therefore they represent right lateral strike slip fauting. Seismic exploration for shallow layers indicates that the Tangshan fault is a right lateral strike slip normal fault with NW dipping and a high dip angle. This fault dislocates the strata of the Holocene (Q 4),late Pleistocene (Q 3),middle Pleistocene (Q 2) and early Pleistocene Series (Q 1).
A ground fissure zone was found by field observation and aerial survey after the Tangshan M 7.8 earthquake of 1976. It indicates that the Tangshan fault is associated with the seismogenic structure of the event. We have made a new study to the activity of this fault by using the information of the satellite remote sensing and the results of seismic exploration to the shallow layers. Explanations of the satellite pictures show that the NE trending Tangshan fault was cut by the NNW trending fault,while the fault of NWW strike was trailed,therefore they represent right lateral strike slip fauting. Seismic exploration for shallow layers indicates that the Tangshan fault is a right lateral strike slip normal fault with NW dipping and a high dip angle. This fault dislocates the strata of the Holocene (Q 4),late Pleistocene (Q 3),middle Pleistocene (Q 2) and early Pleistocene Series (Q 1).
引文
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