| 从长江三峡东段地震与构造关系探讨弱震区的地质构造标志 |
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| 引用本文： | 李安然.从长江三峡东段地震与构造关系探讨弱震区的地质构造标志[J].西北地震学报,1982,4(4):104-109. |
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| 作者姓名： | 李安然 |
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| 作者单位： | 国家地震局地震研究所 |
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| 摘 要： | 本文通过对长江三峡东段发震构造特征,新构造环境和深部构造条件等与地震活动相关性的分析给出了识别弱震区的地质构造标志。
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| 收稿时间： | 1981/4/4 0:00:00 |
| 修稿时间： | 1982/5/12 0:00:00 |
DISCUSSION ON THE GEOLOGICAL STRUCTURE SIGNS OF THE WEAK EARTHQUAKE FROM THE SEISMOTECTONIC RELATIONSHIP IN THE EASTERN GORGE OF THE YANGTZE RIVER |
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| Li Anran.DISCUSSION ON THE GEOLOGICAL STRUCTURE SIGNS OF THE WEAK EARTHQUAKE FROM THE SEISMOTECTONIC RELATIONSHIP IN THE EASTERN GORGE OF THE YANGTZE RIVER[J].Northwestern Seismological Journal,1982,4(4):104-109. |
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| Authors: | Li Anran |
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| Institution: | Institute of Seismology, State Seismological Bureau |
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| Abstract: | Based on studying the feature of seismogenic structure and the neote-ctonic setting as well as on analysing deep-seated structure conditions of the Easter Yangtze Gorge,some geological structure signs of the weak earthquake are discussed in this paper.The Yangtze Gorge is referred to a weak earthquake area in accordance with data up to now.The seismic activities in the region mainly occurred on the surface of East Gorge,so the dependence of relations between them is close and obvious in space As these seismogenic structures are located in the neotectonic background of the whole upheaval and merely dissect the upper crust,there are features of weak earthquake with small intensi-ty,low frequency and shallow focus.In accordance with the seismotectonic relations mentioned above,the signs of geological structure of the weak earthquake in this area may be summarized as follows:1.The seismogenic structures belong to a fault lying in a shallower layer of the crust,which has had no evident dislocation since Quaterna-ry Period.2.The regional neotectonic movements are mainly characterized by con-tinual uplift and subsidence of arched flexures as a whole.Usually the broken river terrace,the dismembered denudation surface and the geomorph-ic gradient belt do not appear.3.The tectonic deformation in the newly-formed sediments is not obvi-ous.It is generally short of Quaternary fold and fault. |
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