华北克拉通中部地区背景噪声成像

Translated title of the contribution: Ambient noise tomography in north China craton

You Cai Tang*, Yong Shun Chen, Ying Jie Yang, Zhi Feng Ding, Rui Feng Liu, Yong Ge Feng, Peng Li, Chun Quan Yu, Song Qiao Wei, Wen Yuan Fan, Hai Yang Wang, Shi Yong Zhou, Jie Yuan Ning

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Peking University deployed two linear arrays (140 km apart) of 45 portable broadband seismometers across the southern part of Shanxi Rift during August 2006 to March 2008. Using the ambient noise records at these two arrays and some stations from North China Seismic Array (NCSA) of the Institute of Geophysics, China Earthquake Administration (CEA), permanent stations from Hebei Seismological Bureau and Shanxi Seismological Bureau, CEA, China, we obtained empirical Green's function of Rayleigh wave employing the cross-correlation technique. Then we measured group velocity and phase velocity at periods from 6 s to 40 s for all possible station pairs. The results of tomography show that substantial lateral variations exist between Ordos and North China Basin (NCB). Sedimentary basins of NCB and Shanxi Rift are clearly imaged as low velocity anomalies at periods of 8 s. Low group velocities at 12∼20 s and phase velocities at 12 ∼16 s may indicate a low velocity layer in the upper and middle crust beneath NCB. However, Ordos and Taihang uplift are imaged as high velocities in the same period range. The rapid change from low velocity anomaly to high anomaly between 16 s and 25 s in phase velocity maps and between 20 s and 30 s in group velocity maps suggests that the Moho depth beneath NCB is much shallower than that beneath Ordos. At longer periods (30 ∼ 40 s), phase velocity maps show that the velocity beneath NCB is lower than that of Ordos, which could be related to the thinning of lithosphere and the upwelling of asthenosphere beneath NCB. Datong volcanic region is revealed as low velocity anomaly in group and phase velocity maps from 8 to 35 s, which could be caused either by high temperature or partial melt in the crust resulting from active magmatism.

Translated title of the contributionAmbient noise tomography in north China craton
Original languageChinese
Pages (from-to)2011-2022
Number of pages12
JournalChinese Journal of Geophysics
Volume54
Issue number8
DOIs
Publication statusPublished - 20 Aug 2011

Bibliographical note

Transliterated article title: "Huá běi kè lā tōng zhōng bù dì qū bèi jǐng zào shēng chéng xiàng"

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