川滇地区近期地壳变形动态特征研究

发布时间：2018-02-09 04:44

本文关键词： 川滇地区断裂带速度场应变率滑动速率 GPS剖面　出处：《武汉大学学报(信息科学版)》2017年12期 　论文类型：期刊论文

【摘要】：基于1999年以来的GPS观测数据,重点分析了川滇地区近期的变形特征,计算给出了该区域主要断裂带的滑动速率,并结合GPS剖面初步识别了断裂带所处的孕震阶段。结果表明,红河断裂带始终处于弱形变区域,值得进一步关注;汶川地震后,由于研究区域应力场的调整和应变的重新分配,使得安宁河断裂带的活动变化较小,逐步趋缓,走滑分量存在明显趋缓现象,并且安宁河断裂带的闭锁深度在一定程度上有所增加;小江断裂带的走滑分量存在明显趋缓现象,显示存在强闭锁现象,小江断裂带平行于断层方向GPS速度剖面显示断裂带两侧变形平缓且变形范围较大;昭通、莲峰断裂的挤压和剪切变形积累均存在弱化现象,可能预示该区域挤压应变积累背景较高。
[Abstract]:Based on the GPS observation data since 1999, the recent deformation characteristics of Sichuan-Yunnan region are analyzed, the slip rate of the main fault zones in the region is calculated, and the seismogenic stage of the fault zone is preliminarily identified according to the GPS profile. The Honghe fault zone is always in the weak deformation area, which deserves further attention. After the Wenchuan earthquake, due to the adjustment of the stress field and the redistribution of strain in the study area, the activity of the Anning River fault zone changes little and gradually slows down. The strike-slip component has obvious slowing down phenomenon, and the locking depth of the Anning River fault zone increases to a certain extent, and the strike-slip component of the Xiaojiang fault zone has obvious slowing down phenomenon, which shows that there is a strong clogging phenomenon. The GPS velocity profile of the Xiaojiang fault zone parallel to the fault direction shows that the deformation of both sides of the fault zone is gentle and the deformation range is large, and the accumulation of compression and shear deformation of Zhaotong and Lianfeng faults are both weakened. It may indicate a higher background of squeeze strain accumulation in this area.
【作者单位】：中国地震局第一监测中心;
【基金】：地震行业专项(201508010) 科技部科技基础性工作专项(2015FY210400) 地震科技星火计划(XH15061Y)~~
【分类号】：P315.2

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