气候变化领域集成服务门户(CCPortal): Seismic Source Tracking With Six Degree-of-Freedom Ground Motion Observations

CCPortal

DOI	10.1029/2020JB021112
	Seismic Source Tracking With Six Degree-of-Freedom Ground Motion Observations
	Yuan S.; Gessele K.; Gabriel A.-A.; May D.A.; Wassermann J.; Igel H.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Back azimuth (BAz) information can be determined from combined measurements of rotations and translations at a single site. Such six degree-of-freedom (6-DoF) measurements are reasonably stable in delivering similar information compared to a small-scale array of three-component seismometers. Here we investigate whether a 6-DoF approach is applicable to tracking seismic sources. While common approaches determining the timing and location of energy sources generating seismic waves rely on the information of P-waves, here we use S-waves. We track back azimuths of directly arriving SH-waves in the two-dimensional case, P-converted SV-waves, direct SV- and direct SH-waves in the three-dimensional case. For data analysis, we compare a cross-correlation approach using a grid-search optimization algorithm with a polarization analysis method. We successfully recover the rupture path and rupture velocity with only one station, under the assumption of an approximately known fault location. Using more than one station, rupture imaging in space and time is possible without a priori assumptions. We discuss the effects of rupture directivity, supershear rupture velocity, source-receiver geometry, wavefield interference, and noise. We verify our approach with the analysis of moving traffic noise sources using 6-DoF observations. The collocated classic seismometer and newly built ring laser gyroscope ROMY near Munich, Germany, allow us to record high-fidelity, broadband 6-DoF (particle velocity and rotational rate) ground motions. We successfully track vehicles and estimate their speed while traveling along a nearby highway using the estimated BAz as a function of time of a single station observation. © 2021. The Authors.
英文关键词	earthquake early warning; earthquake source observations; rotational ground motions; time-series analysis
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/187254
作者单位	Department of Earth and Environment Sciences, Ludwig-Maximilians-Universität München, Munich, Germany; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States
推荐引用方式 GB/T 7714	Yuan S.,Gessele K.,Gabriel A.-A.,et al. Seismic Source Tracking With Six Degree-of-Freedom Ground Motion Observations[J],2021,126(3).
APA	Yuan S.,Gessele K.,Gabriel A.-A.,May D.A.,Wassermann J.,&Igel H..(2021).Seismic Source Tracking With Six Degree-of-Freedom Ground Motion Observations.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Yuan S.,et al."Seismic Source Tracking With Six Degree-of-Freedom Ground Motion Observations".Journal of Geophysical Research: Solid Earth 126.3(2021).