| The accurate location of the injection-induced microearthquakes in German Continental Deep Drilling Program |
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| 作者姓名： | 涂毅敏 陈运泰 |
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| 作者单位： | InstituteofGeophysics，ChinaSeismologicalBureau，InstituteofGeophysics，ChinaSeismologicalBureau Beijing100081，China，Beijing100081，China |
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| 基金项目： | The DFG SFB 526. |
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| 摘 要： | Introduction The scientific drilling belongs to the International Lithosphere Program and is one of the four lithospheres explorations. So far there are more than ten countries, which have taken the scientific drilling. The German Continental Deep Drilling Program was later than the others and is the sec-ond deep drilling, but is the most significant scientific super deep drilling in the world. The Ger-man Continental Deep Drilling Program (Kontinentales Tiefbohrprogram der Bundesrepub…
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| 收稿时间： | 11 October 2001 |
| 修稿时间： | 15 May 2002 |
The accurate location of the injection-induced microearthquakes in German Continental Deep Drilling Program |
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| Tu Yi-min,and Chen Yun-tai.The accurate location of the injection-induced microearthquakes in German Continental Deep Drilling Program[J].Acta Seismologica Sinica(English Edition),2002,15(6):616-627. |
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| Authors: | Tu Yi-min and Chen Yun-tai |
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| Institution: | Institute of Geophysics, China Seismological Bureau, Beijing 100081, China |
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| Abstract: | From August 21, 2000 to October 20, 2000,a fluid injection-induced seismicity experiment has been carried out in the KTB (German Continental Deep Drilling Program). The KTB seismic network recorded more than 2 700 events. Among them 237 events were of high signal-to-noise ratio, and were processed and accurately located. When the events were located, non KTB events were weeded out by Wadatis method. The standard deviation, mean and median were obtained by Jackknife's technique, and finally the events were accurately located by Gei-gers method so that the mean error is about 0.1 km. No earthquakes with focal depth greater than 9.3 km, which is nearly at the bottom of the hole, were detected. One of the explanation is that at such depths the stress levels may not close to the rocks frictional strength so that failure could not be induced by the relatively small perturbation in pore pressure. Or at these depths there may be no permeable, well-oriented faults. This depth may be in close proximity to the bottom of the hole to the brittle-ductile transition, even in this relatively stable interior of the in-teraplate. This phenomenon is explained by the experimental results and geothermal data from the superdeep bore-hole. |
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| Keywords: | scientific deep drilling fluid-injection induced seismicity earthquake location Jackknife method brittle-ductile transition |
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