岷江断裂南段地表破裂存在性的讨论与马脑顶异常负地形的成因

Discussion of the Existence of the Surface Rupture along the South Segment of the Minjiang Fault and Causes of the Abnormal Negative Orography on Manaoding

岷江断裂南段地表破裂的存在性,是近年来颇具争议的问题。研究区位于南北地震带中段,地震频发,1933年叠溪地震是近现代史一次重要地震,然而其发震构造至今悬而未决,2017年研究区又发生了九寨沟7.0级地震,因此岷江断裂南段地震危险性分析的评估非常重要,而其地表破裂的存在性是首先要查证的问题。研究否定了岷江断裂南段地表破裂的存在,并对马脑顶异常负地形的成因做出分析。

The existence of the surface rupture along the south segment of Minjiang Fault has been a controversial issue in recent years.The study area is located in the middle segment of the north-south seismic belt,amid strong seismic activity.The 1933 Diexi earthquake in the study area was an important earthquake in modern history,but the seismogenic fault of this earthquake is still not clear.In 2017,the Jiuzhaigou M 7.0 earthquake occurred in the study area.Therefore,the seismic risk analysis of the south segment of Minjiang Fault is very important,and the existence of the surface rupture is the first thing to check.In this paper,we denied the existence of the surface rupture along the south segment of Minjiang Fault,and analyzed the causes of the abnormal negative orography on Manaoding.