| 项目编号: | 1547516
|
| 项目名称: | Space geodetic observations and modeling of co- and post-seismic deformation due to the 2015 M7.8 Gorkha (Nepal) earthquake |
| 作者: | Yuri Fialko
|
| 承担单位: | University of California-San Diego Scripps Inst of Oceanography
|
| 批准年: | 2016
|
| 开始日期: | 2016-01-01
|
| 结束日期: | 2017-12-31
|
| 资助金额: | 194000
|
| 资助来源: | US-NSF
|
| 项目类别: | Continuing grant
|
| 国家: | US
|
| 语种: | 英语
|
| 特色学科分类: | Geosciences - Earth Sciences
|
| 英文关键词: | earthquake
; gorkha earthquake
; nepal
; research community
; earthquake epicentral area
; earthquake area
; postseismic deformation
; surface deformation
; elastic half-space
; earthquake rupture
; wide-swath coverage
; major shallow thrust earthquake
; well-constrained finite slip model
; coseismic radar interferogram
|
| 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. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93001
|
| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Yuri Fialko. Space geodetic observations and modeling of co- and post-seismic deformation due to the 2015 M7.8 Gorkha (Nepal) earthquake. 2016-01-01.
|
|
|