气候变化领域集成服务门户(CCPortal): Diurnal and Semidiurnal P- and S-Wave Velocity Changes Measured Using an Airgun Source

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DOI	10.1029/2019JB018218
	Diurnal and Semidiurnal P- and S-Wave Velocity Changes Measured Using an Airgun Source
	Wang B.; Yang W.; Wang W.; Yang J.; Li X.; Ye B.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	Monitoring the subtle seismic velocity changes provides a promising tool to study the Earth's dynamic processes. However, the precise monitoring of seismic velocity with high temporal resolution is still challenging especially at large distances. Here, we continuously monitor P-wave and S-wave velocities with a precision of up to 10−5 using an airgun source. During a 1-week experiment conducted in the Yunnan Province, Southwestern China, unambiguous diurnal and semidiurnal velocity changes with amplitudes of ~10−4–10−3 were observed for both P- and S-waves at distances up to 21 km. The amplitudes of P-wave velocity (Vp) change are 1.2 to 3.8 times the amplitudes of S-wave velocity (Vs) changes. The velocity variation decreases with the increase in distance and is larger in the basin region than that in the mountainous region. Seismic velocity change shows less correlation with volumetric tide strain but strong correlation with changes of air temperature and air pressure. We propose that the thermal strains from air temperature changes are the primary cause of the observed diurnal and semidiurnal seismic velocity changes. The stronger Vp than Vs change is explained by the higher Vp sensitivity to the saturation rate. The velocity changes in mountainous area are ascribed mainly to the crack density changes, while both crack density change and saturation change are required to account for the velocity changes in the basin. ©2019. The Authors.
英文关键词	active source; crack density; P-wave; S-wave; thermal strain; velocity change
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/188050
作者单位	School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing, China; Earthquake Agency of Yunnan Province, Kunming, China
推荐引用方式 GB/T 7714	Wang B.,Yang W.,Wang W.,et al. Diurnal and Semidiurnal P- and S-Wave Velocity Changes Measured Using an Airgun Source[J],2020,125(1).
APA	Wang B.,Yang W.,Wang W.,Yang J.,Li X.,&Ye B..(2020).Diurnal and Semidiurnal P- and S-Wave Velocity Changes Measured Using an Airgun Source.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Wang B.,et al."Diurnal and Semidiurnal P- and S-Wave Velocity Changes Measured Using an Airgun Source".Journal of Geophysical Research: Solid Earth 125.1(2020).