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Seismic activity and gravity anomaly characteristics in Yutian, Xinjiang and surrounding regions

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doi: 10.3799/dqkx.2014.166
Authors:Xu Weimin; Chen Shi; Shi Lei
Author Affiliations:Primary:
China Earthquake Administration, Institute of Geophysics, Beijing, China
Volume Title:Earth Science. Journal of China University of Geoscience
Source:Earth Science. Journal of China University of Geoscience, 39(12), p.1831-1841. Publisher: China University of Geoscience, Wuhan, China. ISSN: 1000-2383
Publication Date:2014
Note:In Chinese with English summary. 30 refs.; illus., incl. 1 table, sketch map
Summary:The latest model of the gravitational field was used in analyzing the gravity anomaly characteristics in the Yutian seismic zone and surrounding regions. A layered crustal structure model (Crust1.0) was applied to obtain the deep tectonic structure around the seismic zone. This epicenter occurred in steep variations of crustal thickness. Compared to the Ms7.3 earthquake in 2008 in this region, although these two epicenters were in different 3D spaces, they are closely related to changes in the deep crustal structures. Based on a statistical analysis of the correlation between the seismicity of historical earthquakes (Ms≥5.0) and three different gravity anomalies, we found that the free-air gravity anomalies in the seismic zone have an obvious linear correlation to the topography, while the Bouguer anomaly and isostatic anomaly are distinctly different from the topography. In addition, the total horizontal gradient (HGM) of the anomalies were calculated and the analytical signal (ASL) was plotted, which suggest that the gradient values are more distinctly correlated. The results show that a significant statistical characteristic exists between the activities of strong earthquakes (Ms≥7.0) and the gravity anomalies, which may be related to the uneven mass distribution in the deep structure which caused the gravity anomaly.
Subjects:Activity; Crust; Distribution; Earthquakes; Epicenters; Focal mechanism; Gravity anomalies; Gravity field; Seismicity; Velocity structure; Asia; China; Far East; Xinjiang China; Yutian China; Yutian earthquake 2014
Coordinates:N365200 N365200 E0814200 E0814200
Record ID:781071-8
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