乌什台两次地震钻孔应变异常的对比研究
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摘要
2003年2月24日至12月1日先后在伽师和昭苏县境内发生了MS6.8与MS6.0两次地震,新疆乌什台距两次地震震中200多千米,震前钻孔应变仪均记录到异常。其异常的不同点是:伽师地震前有趋势异常,昭苏地震前则无;伽师地震的应变异常量级大于昭苏地震异常一个数量级;伽师地震异常类型齐全(趋势、短期、临震异常、指数型异常),昭苏地震只有短期和临震异常。其异常的相同点是:短期异常形态、应变性质、异常出现时间基本相当;临震异常的出现时间及波动性基本相同。
On Feb 24~(th), and Dec.1st 2003 two earthquakes of M_S 6.8 and 6.0 occured in Jiashi and (Zhaosu), Xinjiang region. Located about 200 kilometers from both the epicenters, the borehole strain anomalies at Wushi station had been recorded. The difference between these two anomalies is that there was trend anomaly before the Jiashi event while there wasn't before Zhaosu quake and the level of strain anomaly of the former is one order higher than that of the latter. Besides, the anomaly from Jiashi quake had complete styles:trend, short-term, the impending and exponential anomaly, the Zhaosu quake only had two styles: short-term and the impending anomaly.In the other hand, the anomalies of two earthquakes had something in common: the configuration,strain characteristics and occuring time of the short-term anomaly. Besides, the occuring time and fluctuant characteristics of both the impending anormalies were similar to each other.
On Feb 24~(th), and Dec.1st 2003 two earthquakes of M_S 6.8 and 6.0 occured in Jiashi and (Zhaosu), Xinjiang region. Located about 200 kilometers from both the epicenters, the borehole strain anomalies at Wushi station had been recorded. The difference between these two anomalies is that there was trend anomaly before the Jiashi event while there wasn't before Zhaosu quake and the level of strain anomaly of the former is one order higher than that of the latter. Besides, the anomaly from Jiashi quake had complete styles:trend, short-term, the impending and exponential anomaly, the Zhaosu quake only had two styles: short-term and the impending anomaly.In the other hand, the anomalies of two earthquakes had something in common: the configuration,strain characteristics and occuring time of the short-term anomaly. Besides, the occuring time and fluctuant characteristics of both the impending anormalies were similar to each other.
引文
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2杨志荣.1987年1月24日新疆乌什6.4级地震前兆异常及其预报[J].中国地震,1987,3(4):6~12.2 Yang Zhirong.Precursory anomalies and prediction of theWushi earthquke(M=6.4)on 24 January 1987 in Xin-jiang[J].Earthquake Research in China,1987,3(4):6-12.(in Chinese)
3蒋靖祥,尹光华,许风柱.昆仑山口西8.1级地震前库尔勒测区相对应力场变化[J].地震,2003,25(3):89~96.3 Jiang Jingxiang,Yin Guanghua and Xu Fengzhu.Relativestress field change of Kuerle region before 8.1 earthqukein western Kunlun Pass[J].Earthquke,2003,25(3):89-96.(in Chinese)
4蒋靖祥,唐小勇.新疆钻孔应变速率异常的研究[J].四川地震,1999,4,42~50.4 Jiang Jingxiang and Tang Xiaoyong.A sdudy about stainrate anomalies of drilled hole in Xinjiang[J].EarthqukeResearch in Sichuan.1999,4,42-50.(in Chinese)
5许昭永,杨润海,王彬,等.突发应变扰动———一种新的破裂前兆的实验研究[J].地震学报,1998,20(6):628~634.5 Xu Zhaoyong,Yang Runhai,Wang Bin,et al.Burststrain disturbance-A new test study on fracture precur-sor[J].Acta Seismologica Sinica,1998,11(6):737-744.(in Chinese)
6 Dieterich J H.Preseismic fault slip and earthquake pre-diction[J].J Geophys Res,1978,83,3 940-3 948.
7 Dieterich J H.Potential for geophysical experiments inlarge scale tests[J].J.Geophys Res,1981,8,653-656.
8 Ohnaka M.Earthquake source nucleation:a physical mod-el for short-term precursors[J].Tectonophysics,1992,211,149-178.
9 Scholz C,Molnar P,Johnson Y.Detailed sdudies of fric-tional sliding of granite and implications the earthquake-mechanism[J].J Geophys Res,1972,77,6 392-6 406.
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