气候变化领域集成服务门户(CCPortal): Depth-Scanning Algorithm: Accurate, Automatic, and Efficient Determination of Focal Depths for Local and Regional Earthquakes

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DOI	10.1029/2020JB019430
	Depth-Scanning Algorithm: Accurate, Automatic, and Efficient Determination of Focal Depths for Local and Regional Earthquakes
	Yuan J.; Kao H.; Yu J.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Precise source depths are critical to the understanding and interpretation of many seismological and tectonic processes. However, conventional earthquake location methods based on the arrival times of direct P and S phases have far less constraint on focal depths than on epicenters. Therefore, developing a method that can systematically and efficiently estimate focal depths with high accuracy, especially for the vast number of small earthquakes that can only be observed at local and regional distances, would make significant contributions to the geoscience research community. In this study, we develop a new method, named “Depth-Scanning Algorithm,” to efficiently identify depth phases at local and regional distances. We first construct template waveforms of possible depth phases by applying various phase shifts to the original P and S waveforms to mimic the effect of reflection(s). We then systematically scan waveforms after the P and S phases for segments that match the depth-phase templates. The arrival times of those segments are compared to the theoretical arrival times of depth phases predicted with an assumed velocity model and focal depth. We repeat the above process for a range of assumed focal depths, and the one most consistent with the theoretical prediction is deemed the final solution. Synthetic tests and applications to real data demonstrate the merits of our method compared to conventional location methods. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	depth phase; depth scanning; local/regional earthquakes; locating algorithm; match-filtering; phase shift
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/187767
作者单位	State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Chengdu, Sichuan, China; Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada; College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan, China; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada
推荐引用方式 GB/T 7714	Yuan J.,Kao H.,Yu J.. Depth-Scanning Algorithm: Accurate, Automatic, and Efficient Determination of Focal Depths for Local and Regional Earthquakes[J],2020,125(7).
APA	Yuan J.,Kao H.,&Yu J..(2020).Depth-Scanning Algorithm: Accurate, Automatic, and Efficient Determination of Focal Depths for Local and Regional Earthquakes.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Yuan J.,et al."Depth-Scanning Algorithm: Accurate, Automatic, and Efficient Determination of Focal Depths for Local and Regional Earthquakes".Journal of Geophysical Research: Solid Earth 125.7(2020).