玛多—甘德断裂甘德段晚第四纪活动特征

地震 ›› 2010, Vol. 30 ›› Issue (4): 65-73.

玛多—甘德断裂甘德段晚第四纪活动特征

熊仁伟¹, 任金卫¹, 张军龙¹, 杨攀新¹李智敏², 胡朝忠¹, 陈长云¹

1.中国地震局地震预测研究所, 北京 100036;
2.青海省地震局, 青海西宁 810001

收稿日期:2010-01-11 修回日期:2010-07-19 出版日期:2010-10-31 发布日期:2021-10-19
作者简介:熊仁伟(1985-), 男, 陕西平利人, 在读硕士, 主要从事活动构造及地震活动等研究。
基金资助:
国家重点基础研究发展计划项目(2008CB425702)

Late Quaternary Active Characteristics of the Gande Segment in the Maduo-Gande Fault Zone

XIONG Ren-wei¹, REN Jin-wei¹, ZHANG Jun-long¹, YANG Pan-xin¹ LI Zhi-min², HU Chao-zhong¹, CHEN Chang-yun¹

1. Institute of Earthquake Science, CEA, Beijing 10036, China;
2. Earthquake Adminstration of Qinghai Province, Xi'ning 810001, China

Received:2010-01-11 Revised:2010-07-19 Online:2010-10-31 Published:2021-10-19

摘要/Abstract

摘要： 玛多—甘德断裂是巴颜喀拉块体内部的一条活动断裂。通过野外调查发现, 在玛多-甘德断裂的甘德段保留有一条较好的地震地表破裂带。破裂带整体走向NW向, 长约为50 km。野外获得的最大左旋水平位移7.6 m, 最大垂直位移4 m。沿破裂带有大量地震活动的遗迹, 地表破裂类型十分丰富。通过对各种地质地貌现象的调查与分析, 认为该破裂带形成时代较新。断裂带在地貌上发育有线性排列的垭口、断层三角面、断层陡坎、断层泉、断错水系、山脊扭错、断塞塘、鼓包等现象。根据野外考察并结合现有资料分析, 该破裂带可能是该区域内历史上一次较为强烈地震的产物。据此推断, 巴颜喀拉块体内部的玛多—甘德断裂晚第四纪以来可能有过强烈的活动并至今活跃。

关键词: 玛多—甘德断裂, 地震地表破裂, 巴颜喀拉块体, 晚第四纪

Abstract: Maduo-Gande fault is an active fault within the Bayan Har block. According to our field investigation, there was an earthquake rupture zone on the Gande segment of Maduo-Gande fault zone. We found that the length of the rupture zone is about 50 km, with the general trend of NW. The maximum sinistral-horizontal dislocation is about 7.6 m and the maximum vertical dislocation is about 4m. A large number of earthquake traces were found along the rupture zone and the surface rupture phenomena were also various. It is believed that the rupture zone with the formation of a relatively new era through the field investigation and analysis on the geological and geomorphological phenomena. A series of linear arranged pass, fault triangles, fault scarps, fault springs, gullies dislocation, ridges twisted, sag-ponds, pressure ridges, et al. exist along the fault. Based on the field investigation and the materials available, we believe that the rupture zone is due to a strong earthquake in the history of this area. And it is inferred that the Maduo-Gande fault in the Bayan Har block had intense activities since late quaternary and may still be active nowadays.

Key words: Maduo-Gande fault, Earthquake surface rupture, Bayan Har block, Late Quaternary

中图分类号:

P315.7

熊仁伟, 任金卫, 张军龙, 杨攀新李智敏, 胡朝忠, 陈长云. 玛多—甘德断裂甘德段晚第四纪活动特征[J]. 地震, 2010, 30(4): 65-73.

XIONG Ren-wei, REN Jin-wei, ZHANG Jun-long, YANG Pan-xin LI Zhi-min, HU Chao-zhong, CHEN Chang-yun. Late Quaternary Active Characteristics of the Gande Segment in the Maduo-Gande Fault Zone[J]. EARTHQUAKE, 2010, 30(4): 65-73.

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