项目名称: 安宁河-则木河断裂带滑移速率的GPS反演
项目编号: No.41204001
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地球物理学和空间物理学
项目作者: 丁开华
作者单位: 中国地质大学(武汉)
项目金额: 25万元
中文摘要: 本项目拟通过对川滇地区收集到的1999-2011年间GPS资料的高精度数据处理,获得该区最新的GPS速度场。结合关于安宁河-则木河断裂带活动性的地质学成果,并基于粘弹性模型,利用贝叶斯估计方法联合反演该断裂带的滑动速率,以及复发周期、弹性层厚度和松弛时间等参数。在联合反演中,同时考虑大凉山断裂和马边断裂等平行断裂对安宁河-则木河断裂活动性的影响,进而探讨鲜水河断裂至安宁河-则木河断裂的滑移速率失衡问题。此外,利用反演得到的结果对复发周期与断裂带的地震危险性,松弛时间与下地壳层流模型进行分析和讨论。 本项目拟开展的研究对探讨川滇地区潜在的强震危险性、安宁河-则木河断裂带在川滇块体东边界的地壳运动与变形的调节作用、以及青藏高原东南缘的下地壳层流模型及力学机制等科学问题都具有重要的意义。
中文关键词: 安宁河-则木河断裂带;GPS;滑动速率;同震形变;震后形变
英文摘要: In this proposal, the latest GPS velocity in Sichuan-Yunnan area will be obtained by high-precision GPS data processing with GPS data between 1999 and 2011. Based on the viscoelastic model, the slip rate, recurrence interval, elastic-layer thickness, and relaxation time about Anninghe-Zemuhe fault zone will be inversed through Bayeasian estimation, by combining GPS velocity with geological results in this area.In the joint inversion, the influence of Daliangshan fault and Mabian fault will be considered simultaneously, so as to discuss about the velocity deficit from Xianshuihe fault to Anninghe-Zemuhe fault. Furthermore, the seismic risk and recurrence interval, the relaxation time and lower crust laminar flow model in this area, will be analyzed and discussed by the joint inversion. Through the implementation of this proposal, it is of important significance to explore some scientific problems, such as the potential seismic risk in Sichuan-Yunnan area, the accommodation of Anninghe-Zemuhe fault zone on crust movement and deformation along the east boundary belt of the Sichuan-Yunnan block, and the lower crust laminar flow model and mechanical mechanism in southeastern Qinghai-Tibet plateau.
英文关键词: Anninghe-Zemuhe Fault;GPS;slip rate;coseismic deformation;postseismic deformation