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

Research output: Contribution to journalArticleResearchpeer-review

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.

Translated title of the contributionThe 16 August 2003 Chifeng earthquake: Is it a lower crust earthquake?
LanguageChinese
Pages111-119
Number of pages9
JournalChinese Journal of Geophysics
Volume52
Issue number1
Publication statusPublished - Jan 2009
Externally publishedYes

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lower crust
crusts
Earthquakes
earthquakes
earthquake
stations
broadband
Rocks
rocks
body wave
Ointments
focal mechanism
stacking
rock
dip
slip
receivers
station
method

Keywords

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

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.
Wei, Sheng Ji ; Ni, Si Dao ; Chong, Jia Jun ; Zheng, Yong ; Chen, Yong. / 2003年8月16日赤峰地震 : 一个可能发生在下地壳的地震?. In: Chinese Journal of Geophysics. 2009 ; Vol. 52, No. 1. pp. 111-119.
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Wei, SJ, Ni, SD, Chong, JJ, 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, vol. 52, no. 1, pp. 111-119.

2003年8月16日赤峰地震 : 一个可能发生在下地壳的地震? / Wei, Sheng Ji; Ni, Si Dao; Chong, Jia Jun; Zheng, Yong; Chen, Yong.

In: Chinese Journal of Geophysics, Vol. 52, No. 1, 01.2009, p. 111-119.

Research output: Contribution to journalArticleResearchpeer-review

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Wei SJ, Ni SD, Chong JJ, Zheng Y, Chen Y. 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. 2009 Jan;52(1):111-119.