期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 4, 页码 1039-1045出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062097
关键词
-
资金
- University of Utah Center for High Performance Computing
- NSF [EAR-1014749, EAR-1344579]
- NERC [NE/H022473/1]
- NERC [NE/K006290/1, NE/H022473/1] Funding Source: UKRI
- Natural Environment Research Council [NE/H022473/1, NE/K006290/1] Funding Source: researchfish
- Division Of Earth Sciences
- Directorate For Geosciences [1014749] Funding Source: National Science Foundation
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 8.5 km, and a density increase of 6%. This 1:1 V-S:V-P velocity decrease is commensurate with a ULVZ compositional origin and is most consistent with highly iron enriched ferropericlase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据