DOI: 10.1002/2013GL057781
论文题名: Structure downdip of deep low-frequency earthquakes in western Shikoku, Japan, revealed by P and S waves propagating at slow apparent velocities from intraslab earthquakes
作者: Kuge K.
刊名: Geophysical Research Letters
ISSN: 0094-8425
EISSN: 1944-8156
出版年: 2013
卷: 40, 期: 21 起始页码: 5646
结束页码: 5651
语种: 英语
英文关键词: deep low-frequency earthquake
; P wave
; S wave
; slow apparent velocity
; velocity structure
; western Shikoku
Scopus关键词: Apparent velocity
; Low-frequency earthquakes
; P waves
; S-waves
; Velocity structure
; western Shikoku
; Earthquakes
; Seismic waves
; Shear waves
; Velocity
; earthquake engineering
; earthquake epicenter
; frequency analysis
; lower crust
; mantle
; P-wave
; S-wave
; velocity
; wave propagation
; Japan
; Shikoku
英文摘要: For P waves traveling downdip of deep low-frequency earthquakes (LFEs) from intraslab earthquakes in western Shikoku, Japan, we observed distinct later arrivals with slow apparent velocities comparable to velocities of the lower crust. The apparent velocities of predominant S waves were also in the range of lower crust speeds. Such observations suggest that the low-velocity oceanic crust connects with the island arc crust beneath the western Seto Inland Sea, which may be due to direct contact or the presence of low-velocity wedge mantle between the crusts. As high-velocity mantle is not likely near deep LFEs in the region, deep LFEs occur either at the crust-crust boundary or at the boundary between the oceanic crust and the overriding low-velocity mantle. Observations of later arrivals differed between earthquakes in eastern and western Shikoku, implying that the location of the high-velocity mantle can vary and affect temperatures along the zone where deep LFEs occur. Key Points P and S waves with slow apparent velocities travel in western Shikoku, Japan The island arc and oceanic crust connect beneath the western Seto Inland Sea High-velocity mantle is not near the zone of deep low-frequency earthquakes ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887291508&doi=10.1002%2f2013GL057781&partnerID=40&md5=3c3412138a2b174983c667c1fbf56683
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5689
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics, Kyoto University, Kyoto 606-8502, Japan
Recommended Citation:
Kuge K.. Structure downdip of deep low-frequency earthquakes in western Shikoku, Japan, revealed by P and S waves propagating at slow apparent velocities from intraslab earthquakes[J]. Geophysical Research Letters,2013-01-01,40(21).