气候变化领域集成服务门户(CCPortal): Mapping the Sources of Proximal Earthquake Infrasound

CCPortal

DOI	10.1029/2020GL091421
	Mapping the Sources of Proximal Earthquake Infrasound
	Johnson J.B.; Mikesell T.D.; Anderson J.F.; Liberty L.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	We recorded a MWR3.6 earthquake in Idaho (USA) on 7 April 2020 with a network of six three-element infrasound arrays and co-located broadband seismometers situated within 25 km of the hypocenter. Infrasound array processing is used to identify the arrival of seismic-to-atmospheric coupled phases and as much as 90 s of infrasound coda. Apparent velocities ranging from seismic speeds to subhorizontal atmospheric sound speeds are attributed to a superposition of coincident waves arriving at the arrays. We find that the arriving infrasound originates from a broad range of back azimuths that deviates from epicentral back azimuth and indicates the ubiquity of secondary radiators for this relatively small earthquake. Secondary radiators, which often locate in regions of elevated topography, are identified using backprojections and earthquake initiation time. Analysis of infrasound sources from proximal earthquakes can be used to map ground shaking distributions, which are important for assessment of earthquake hazards. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Array processing; Radiators; Topography; Apparent velocity; Backprojections; Broad-band seismometers; Earthquake hazard; Ground-shaking; Initiation time; Small earthquakes; Sound speed; Earthquakes; azimuth; earthquake event; elevation; information processing; infrasonics; seismograph; topography; Idaho; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169308
作者单位	Department of Geosciences, Boise State University, Boise, ID, United States
推荐引用方式 GB/T 7714	Johnson J.B.,Mikesell T.D.,Anderson J.F.,et al. Mapping the Sources of Proximal Earthquake Infrasound[J],2020,47(23).
APA	Johnson J.B.,Mikesell T.D.,Anderson J.F.,&Liberty L.M..(2020).Mapping the Sources of Proximal Earthquake Infrasound.Geophysical Research Letters,47(23).
MLA	Johnson J.B.,et al."Mapping the Sources of Proximal Earthquake Infrasound".Geophysical Research Letters 47.23(2020).