DOI: 10.1002/grl.50213
论文题名: The synchronous occurrence of shallow tremor and very low frequency earthquakes offshore of the Nicoya Peninsula, Costa Rica
作者: Walter J.I. ; Schwartz S.Y. ; Protti M. ; Gonzalez V.
刊名: Geophysical Research Letters
ISSN: 0094-9140
EISSN: 1944-8871
出版年: 2013
卷: 40, 期: 8 起始页码: 1517
结束页码: 1522
语种: 英语
英文关键词: Costa Rica
; slow slip
; tremor
; very low frequency earthquakes
Scopus关键词: Costa Rica
; Earthquake and tsunamis
; Earthquake rupture
; Megathrust earthquakes
; Pressure transient
; slow slip
; tremor
; Very low frequency
; Loading
; Earthquakes
; coastal zone
; correlation
; earthquake event
; friction
; plate tectonics
; shallow water
; slip rate
; temporal analysis
; thrust
; Costa Rica
; Nicoya Peninsula
英文摘要: The occurrence of transient, shallow slow slip at seismogenic zones has important implications for earthquake and tsunami hazards. Here we provide evidence that a tremor and slow slip event occurred at shallow depth offshore of the Nicoya Peninsula, Costa Rica, in August 2008. The temporal coincidence of offshore tremor, very low frequency earthquakes (VLFEs), motions consistent with slow slip on the plate interface on western coastal GPS stations, and a pressure transient in an IODP borehole all indicate slow slip occurring at shallow depths. Large ocean loading stresses on the shallow plate interface modulate tremor activity, with the peak Coulomb stress forced by semi-diurnal ocean tides correlating with tremor productivity. Based on beamforming data, we constrain that the VLFE activity occurs in the same region as the tremor and slow slip. The presence of slow slip at shallow depth has important implications for the up-dip extent of earthquake rupture. The proximity of the 5 September 2012, Mw 7.6 megathrust earthquake to slow slip, tremor, and VLFE activity in the 2008 event suggests abrupt frictional transitions from locked to conditionally stable behavior on the plate interface offshore of the Nicoya Peninsula. Key Points First observation of very-low frequency earthquakes (VLFEs) outside of Japan Synchronous evidence of offshore slow slip, tremor, and VLFEs Offshore tremor and slow slip adjacent to 2012 Mw 7.6 megathrust earthquake. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877953277&doi=10.1002%2fgrl.50213&partnerID=40&md5=f5559edbdccce6ddfb62e7f1228e2a76
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6404
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz CA, United States
Recommended Citation:
Walter J.I.,Schwartz S.Y.,Protti M.,et al. The synchronous occurrence of shallow tremor and very low frequency earthquakes offshore of the Nicoya Peninsula, Costa Rica[J]. Geophysical Research Letters,2013-01-01,40(8).