气候变化领域集成服务门户(CCPortal): Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study

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DOI	10.1029/2019JB019102
	Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study
	Kolínský P.; Schneider F.M.; Bokelmann G.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Stripe-like patterns of surface wave arrival angle deviations have been observed by several seismological studies around the world, but this phenomenon has not been explained so far. Here we test the hypothesis that systematic arrival angle deviations observed at the AlpArray broadband seismic network in Europe are interference patterns caused by diffraction of surface waves at single small-scaled velocity anomalies. We use the observed pattern of Rayleigh waves from two earthquakes under the Southern Atlantic Ocean, and we fit this pattern with theoretical arrival angles derived by a simple modeling approach describing the interaction of a seismic wavefield with small anomalies. A grid search inversion scheme is implemented, which indicates that the anomaly is located in Central Africa, with its head under Cameroon. Moreover, the inversion enables the characterization of the anomaly: The anomaly is inferred to be between 320 and 420 km wide, matching in length the 2,500 km long upper mantle low-velocity region under the volcano-capped swells of the Cameroon volcanic line. We show that this approach can be generally used for studying the upper mantle anomalies worldwide. ©2020. The Authors.
英文关键词	AlpArray; Cameroon volcanic line; diffraction; hotspot; surface waves; tomography
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187774
作者单位	Department of Meteorology and Geophysics, University of Vienna, Vienna, Austria; Section “Seismology”, Helmholtz Centre Potsdam—German Research Centre for Geosciences (GFZ), Potsdam, Germany
推荐引用方式 GB/T 7714	Kolínský P.,Schneider F.M.,Bokelmann G.. Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study[J],2020,125(7).
APA	Kolínský P.,Schneider F.M.,&Bokelmann G..(2020).Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Kolínský P.,et al."Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study".Journal of Geophysical Research: Solid Earth 125.7(2020).