DOI: 10.1002/2015GL063838
论文题名: Crustal subsidence observed by GRACE after the 2013 Okhotsk deep-focus earthquake
作者: Tanaka Y. ; Heki K. ; Matsuo K. ; Shestakov N.V.
刊名: Geophysical Research Letters
ISSN: 0094-8698
EISSN: 1944-8429
出版年: 2015
卷: 42, 期: 9 起始页码: 3204
结束页码: 3209
语种: 英语
英文关键词: 2013 Okhotsk deep-focus earthquake
; coseismic gravity change
; crustal deformation
; GRACE
; satellite geodesy
Scopus关键词: Deformation
; Earthquakes
; Subsidence
; Crustal deformations
; Deep-focus earthquakes
; GRACE
; Gravity changes
; Satellite geodesy
; Geodetic satellites
; coseismic process
; crustal deformation
; deep sea
; earthquake magnitude
; GRACE
; gravity field
; subsidence
英文摘要: Coseismic gravity changes stem from (1) vertical deformation of layer boundaries with density contrast (i.e., surface and Moho) and (2) density changes of rocks at depth. They have been observed in earthquakes with Mw exceeding ∼8.5 by Gravity Recovery and Climate Experiment (GRACE) satellites, but those of M8 class earthquakes have never been detected clearly. Here we report coseismic gravity change of the 24 May 2013 Okhotsk deep earthquake (Mw8.3), smaller than the detection threshold. In shallow thrust faulting, factor (2) is dominant, while factor (1) remains secondary due to poor spatial resolution of GRACE. In the 2013 Okhotsk earthquake, however, factor (2) is insignificant because they occur at depth exceeding 600km. On the other hand, factor (1) becomes dominant because the centers of uplift and subsidence are well separated and GRACE can resolve them. This enables GRACE to map vertical ground movements of deep earthquakes over both land and ocean. Key Points Gravity change of a M8 class earthquake was first detected by satellites Deep-focus earthquakes change the gravity mainly by surface deformation GRACE can map 2-D crustal deformation of deep-focus earthquakes ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930473466&doi=10.1002%2f2015GL063838&partnerID=40&md5=dca5fea700be9fe1e14b9f68c3751e43
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8314
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Department of Natural History Sciences, Hokkaido University, Sapporo, Japan
Recommended Citation:
Tanaka Y.,Heki K.,Matsuo K.,et al. Crustal subsidence observed by GRACE after the 2013 Okhotsk deep-focus earthquake[J]. Geophysical Research Letters,2015-01-01,42(9).