联合GPS和InSAR数据研究鲜水河—安宁河—则木河断裂系的凹凸体分布

项目名称： 联合GPS和InSAR数据研究鲜水河—安宁河—则木河断裂系的凹凸体分布

项目编号： No.41404012

项目类型： 青年科学基金项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 江国焰

作者单位： 中国地震局地质研究所

项目金额： 26万元

中文摘要： 近十几年来，鲜水河—安宁河—则木河断裂系的地震危险性一直是我国地震领域关注的焦点和研究热点问题之一。课题联合GPS和InSAR数据，结合地质和地球物理资料，反演该断裂带上的震间滑动亏损速率分布，确定断裂带上凹凸体的大小和位置，为大震设防工作的开展提供更具科学意义的参考。首先在吸收现有3D弹性震间形变模型和粘弹性模型的优点基础上，建立新的更为全面的3D粘弹性震间形变模型；然后利用地质和地震波反演结果等资料建立断裂带破裂分段模型和区域地壳结构模型，并利用三角形位错元构建断裂带几何模型；最后利用3D粘弹性震间形变模型反演震间滑动亏损速率分布，并分析不同的权比设定和粘滞系数对反演结果的影响。此外，课题还需要对反演结果的可靠性进行分辨率验证；并分析根据滑动亏损速率分布得到的物理含义十分明确的凹凸体与通过b值分布得到的凹凸体之间的联系与区别，以及与断裂带上的小（微）震分布的联系。

中文关键词： GPS；InSAR；3D粘弹性震间形变模型；大地测量反演；凹凸体分布

英文摘要： In recent decades, the seismic hazards of the Xianshuihe-Anninghe-Zemuhe fault system are always the research focus and hotspot problems of seismologic field in China. Our project will combine GPS and InSAR data, as well as other geological and geophysical results, to invert the slip deficit rate distribution of this fault system, and then determine the sizes and positions of potential seismogenic asperities. Furthermore, the suggestions with more scientific significance are presented for earthquake fortification. Firstly, a new and more comprehensive 3D viscoelastic interseismic deformation model will be developed through absorbing the advantages of published 3D elastic and viscoelastic models. Secondly, the historical earthquake rupture segment model and regional crustal model will be built based on published geological and geophysical results. Thirdly, the slip deficit rate distribution will be inverted with the new 3D viscoelastic model and the influences on the inversion results from different weight ratios and viscosities will be explored. Additionally, we need to implement a resolution test on the inversion results to inspect their reliability. In the last, the sizes and positions of potential seismogenic asperities will be presented and compared with that obtained from b values. And the relationship with

英文关键词： GPS；InSAR；3D viscoelastic deformation model；Geodetic inversion；Asperity distribution