鈥楻epeating earthquakes鈥?associated with the WFSD-1 drilling site

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• 作者：Xiaojing Ma¹ ; ^{maxiaojing07@gmail.com" class="auth_mail} ; Zhongliang Wu ; ^{wuzl@cea-igp.ac.cn" class="auth_mail} ; Changsheng Jiang ; ^{jiangcs@cea-igp.ac.cn" class="auth_mail}
• 关键词：&lsquo ; Repeating earthquakes&rsquo ; Waveform cross-correlation ; Slip rate ; Wenchuan aftershock sequence ; WFSD
• 刊名：Tectonophysics
• 出版年：21 April, 2014
• 年：2014
• 卷：619-620
• 期：Complete
• 页码：44-50
• 全文大小：1219 K

文摘

We cross-correlated three-component seismic waveforms to find 鈥榬epeating events鈥?among the aftershocks of the 2008 Wenchuan earthquake centered at the WFSD-1 drilling site during and after the drilling. The aftershocks selected occurred from 2008/10/01 to 2011/09/15, with a magnitude range of M_L 1.4-5.5. Using the 1-10 Hz bandpass filtered waveforms recorded by the regional and mobile seismic stations, 518 鈥榬epeating events鈥?are identified with the criterion that for at least one station the three components of seismograms all have cross-correlation coefficients larger than 0.8. Using 12 鈥榬epeating multiplets鈥? defined by the criterion that each pair of events in the 鈥榤ultiplet鈥?must be 鈥榬epeating pairs鈥? fault slip rates are estimated. Slip rate was averaged at about 5 mm/year, being within the range of the deformation rate before the Wenchuan earthquake obtained by 鈥榬epeating earthquakes鈥? with a weak attenuating trend, and a suspected disturbance by a strong aftershock.