气候变化领域集成服务门户(CCPortal): Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China

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DOI	10.1016/j.tecto.2021.228973
	Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China
	Qu J.; Gao S.S.; Wang C.; Liu K.H.; Zhou S.; Yang Y.; Sui Y.; Zhang Z.
发表日期	2021
ISSN	00401951
卷号	814
英文摘要	The Jiaodong Peninsula of eastern China is densely populated and prone to frequent moderate-strong earthquakes that are mostly distributed along a group of northeastern oriented Mesozoic-Cenozoic faults. An improved understanding of the seismic velocity structure in the area is of great significance for the roles that the faults played in the formation and evolution of the various tectonic features and for the assessment of future earthquake risks. By utilizing earthquake records of the Shandong Provincial Seismic Network for the period from January 2013 to January 2020, this study simultaneously re-locates earthquakes and determines the three-dimensional P-wave velocity structure beneath the Jiaodong Peninsula using regional P-wave travel times by applying the double-difference tomography method. After the relocation, the travel time residuals are reduced by an order of magnitude, and the epicenters are more concentrated and demonstrate a closer spatial relationship with known active faults. The resulting P-wave velocity structure at different horizon depths indicates lateral heterogeneities in the study area. Clear differences in the characteristics of velocity anomalies are observed between the Jiaobei Uplift, Jiaolai Basin and Sulu ultra-high pressure metamorphic belt. The anomalies are mostly NE oriented, which is consistent with the strike of the regional faults and may suggest structural control of the faults to the geological configurations. Earthquakes generally occurred along the edges of high or low velocity regions, and areas accommodating the intersections of the Penglai-Weihai, Penglai-Qixia and Mouping-Jimo fault zones have the greatest potential for future damaging earthquakes in the area. © 2021 Elsevier B.V.
关键词	Double-difference tomography Earthquake relocation Fault zone structure Jiaodong Peninsula Seismic velocities
英文关键词	Acoustic wave velocity; Faulting; Risk assessment; Seismic waves; Structural dynamics; Traffic control; Wave propagation; Double-difference tomography; Formation and evolutions; Lateral heterogeneity; Low velocity region; P-wave velocity structure; Seismic velocity structure; Spatial relationships; Travel-time residuals; Earthquakes; crustal structure; earthquake event; fault zone; P-wave; relocation; seismic tomography; seismic velocity; velocity structure; China; Shandong; Shandong Peninsula
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208057
作者单位	Shandong Earthquake Agency, Jinan, 250102, China; Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO65401, United States; Institute of Geophysics, China Earthquake Administration, Beijing, 100029, China; Shandong Bureau of Coal Geology, Jinan, 250102, China
推荐引用方式 GB/T 7714	Qu J.,Gao S.S.,Wang C.,et al. Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China[J],2021,814.
APA	Qu J..,Gao S.S..,Wang C..,Liu K.H..,Zhou S..,...&Zhang Z..(2021).Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China.Tectonophysics,814.
MLA	Qu J.,et al."Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China".Tectonophysics 814(2021).