2003年8月16日赤峰地震

一个可能发生在下地壳的地震?

Translated title of the contribution: The 16 August 2003 Chifeng earthquake: Is it a lower crust earthquake?

Sheng Ji Wei, Si Dao Ni*, Jia Jun Chong, Yong Zheng, Yong Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We used broadband teleseismic data of Chifeng station to calculate the Receiver Functions, then obtained a velocity model with H-K stacking method in combination with CRUST2.0 and other previous work. With this velocity model and broadband records from 5 CDSN stations, we inverted focal mechanisms of Chifeng earthquake on August 16th, 2003 with the "Cut and Paste" (CAP) method. Then we confirmed focal depth and the source mechanisms by comparing synthetic body waves at teleseismic distance with broadband records of 9 IRIS stations. Our result shows that the best double couple solution of this Mw5.2 event is 315°, 64° and 19° for strike, dip and slip angles respectively, the second nodal plane solution is 216°, 74°, and 152°. The focal depth is 25 ± 2 km, suggesting that this quake occurred in the lower crust which is much deeper than most continental earthquakes. This lower crust earthquake requires that the rock should be colder than expected. We proposed generation mechanism of this deep earthquake and its implications in rock strength and thermal state.

Original languageChinese
Pages (from-to)111-119
Number of pages9
JournalChinese Journal of Geophysics
Volume52
Issue number1
Publication statusPublished - Jan 2009
Externally publishedYes

Keywords

  • Focal depth
  • Local waveform
  • Lower crust earthquake
  • Source mechanism
  • Teleseismic waveform

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  • Cite this

    Wei, S. J., Ni, S. D., Chong, J. J., Zheng, Y., & Chen, Y. (2009). 2003年8月16日赤峰地震: 一个可能发生在下地壳的地震? Chinese Journal of Geophysics, 52(1), 111-119.