| DOI: | 10.1002/2014GL062097
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| 论文题名: | A compositional origin to ultralow-velocity zones |
| 作者: | Brown S.P.; Thorne M.S.; Miyagi L.; Rost S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8956
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| EISSN: | 1944-8687
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| 出版年: | 2015
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| 卷: | 42, 期:4 | | 起始页码: | 1039
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| 结束页码: | 1045
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| 语种: | 英语
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| 英文关键词: | ultralow-velocity zones
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| Scopus关键词: | Acoustic wave velocity
; Earthquakes
; Seismic waves
; Seismology
; Shear waves
; Velocity control
; Wave propagation
; Compositional origins
; Ferropericlase
; P-wave velocity
; S-wave velocity
; Spike detection
; Synthetic seismogram
; Ultralow velocity zone
; Vertical component
; Velocity
; amplitude
; database
; detection method
; measurement method
; S-wave
; seismogram
; travel time
; velocity profile
; wave velocity
; waveform analysis
; Alice Springs
; Australia
; Coral Sea
; Fiji
; Northern Territory
; Pacific Ocean
; Tonga Trench
; Anthozoa
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| 英文摘要: | We analyzed vertical component short-period ScP waveforms for 26 earthquakes occurring in the Tonga-Fiji trench recorded at the Alice Springs Array in central Australia. These waveforms show strong precursory and postcursory seismic arrivals consistent with ultralow-velocity zone (ULVZ) layering beneath the Coral Sea. We used the Viterbi sparse spike detection method to measure differential travel times and amplitudes of the postcursor arrival ScSP and the precursor arrival SPcP relative to ScP. We compare our measurements to a database of 340,000 synthetic seismograms finding that these data are best fit by a ULVZ model with an S wave velocity reduction of 24%, a P wave velocity reduction of 23%, a thickness of 8.5km, and a density increase of 6%. This 1:1 VS:VP velocity decrease is commensurate with a ULVZ compositional origin and is most consistent with highly iron enriched ferropericlase. ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84924854136&doi=10.1002%2f2014GL062097&partnerID=40&md5=df7d79b61b9af7ecb9c3799073d8bf1d
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8572
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
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| Recommended Citation: | |
Brown S.P.,Thorne M.S.,Miyagi L.,et al. A compositional origin to ultralow-velocity zones[J]. Geophysical Research Letters,2015-01-01,42(4).
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