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项目编号 | 1547516 |
Space geodetic observations and modeling of co- and post-seismic deformation due to the 2015 M7.8 Gorkha (Nepal) earthquake | |
Yuri Fialko | |
主持机构 | University of California-San Diego Scripps Inst of Oceanography |
项目开始年 | 2016 |
2016 | |
项目结束日期 | 2017-12-31 |
资助机构 | US-NSF |
项目类别 | Continuing grant |
项目经费 | 95253(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | The 2015 magnitude 7.8 Gorkha (Nepal) earthquake was the largest earthquake at the southern edge of Tibet in the last 80 years. We will use precise measurements of surface deformation to study the earthquake rupture, as well slow relaxation of the Earth?s crust following the earthquake. These measurements will bear on a long-standing debate about mechanical properties and strength of rocks comprising the lower crust and upper mantle beneath Tibet. We will compare and contrast the observed deformation due to the 2015 Gorkha earthquake with observations from other large events in the region, in particular the 2005 Kashmir (Pakistan) earthquake. This will result in better understanding of seismic hazards in Nepal and surrounding areas. The 2015 Gorkha earthquake was well imaged by the recently launched Interferometric Synthetic Aperture Radar (InSAR) missions, such as ALOS-2 and Sentinel-1. Short revisit times and wide-swath coverage of new operating satellites will allow measurements of postseismic deformation due to a major shallow thrust earthquake in unprecedented details. We will use coseismic radar interferograms from different lines of sight to derive a well-constrained finite slip model of the 2015 Gorkha earthquake. Because the earthquake epicentral area is characterized by a highly variable relief, we will evaluate the effects of topography by comparing results of inversions assuming elastic half-space, and finite element models that explicitly account for topography. These models will also accurately account for the 3-D elastic structure of the crust, as inferred from seismic tomography data. We will process and analyze a rich 2-year-long catalog of radar acquisitions in the earthquake area, generate time series of postseismic deformation, and combine available InSAR and GPS data to investigate the mechanisms of postseismic relaxation. Data and modeling results generated under the auspices of this project will be made available to a wider research community. |
来源学科分类 | Geosciences - Earth Sciences |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/69051 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Yuri Fialko.Space geodetic observations and modeling of co- and post-seismic deformation due to the 2015 M7.8 Gorkha (Nepal) earthquake.2016. |
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