1999年海城—岫岩地震序列的精准定位
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摘要
1999年11月29日,北京时间12点10分39秒(04:10:39UTC)在我国辽宁海城—岫岩地区发生了一次MS5.4地震.这次地震是继1975年2月4日海城MS7.3地震之后该地区发生的震级最大的一次地震.区域性的辽宁数字地震台网记录了这一序列的前震、主震与余震.本文运用该台网的记录资料,用双差法对海城—岫岩地震序列重新定位,得到了该序列事件之间精确的相对位置;然后以中国地震局地球物理研究所(IGCEA)与美国南卫理大学(SMU)合作的辽宁海城—岫岩地区地震试验场宽频带地震台网(BSN)记录的、经过精准定位的地震作为近震源观测的"地面实况"(groundtruth,GT)事件进行校正,得到了这一地震序列的既精确又准确的震源参数.由此得出1999年海城—岫岩地震的发震构造是与1975年海城地震的发震构造海城河—大洋河断裂邻近的康家岭断裂.康家岭断裂的走向与海城河—大洋河断裂走向一致,均为WNW--ESE方向.它们都是在中国东北—华北地区近ENE--WSW向、几乎水平的压应力场作用下产生的断裂.1999年海城—岫岩地震是在海城河—大洋河断裂的影响带动下,邻近的、与其走向一致的康家岭断裂活动的结果.
An earthquake of MS5.4 occurred in Haicheng--Xiuyan area,Liaoning,northeastern China at 12:10:39 BJT(04:10:39 UTC)on November 29,1999.This event is the largest to occur since the 1975 Haicheng MS7.3 earthquake in Haicheng--Xiuyan area.The foreshocks,mainshock and aftershocks of the sequence were well-recorded by Liaoning Digital Seismic Network(LNDSN).Firstly,we used the regional distance travel time data recorded by the LNDSN to relocate the Haicheng--Xiuyan earthquake sequence by using double-difference earthquake location algorithm.Secondly,the earthquakes with well-recorded near-source recordings by Institute of Geophysics,China Earthquake Administration(IGCEA)and Southern Methodist University(SMU)Broadband Seismic Network(BSN)in the Haicheng--Xiuyan area are employed as ground truth(GT)events to calibrate the source parameters of the Haicheng--Xiuyan earthquake sequence.The obtained precise and accurate hypocentral distribution of the sequence clearly indicated that a nearby local Kangjialing fault is the seismogenic fault of the Haicheng--Xiuyan earthquake sequence.The WNW--ESE striking Kangjialing fault is nearly parallel to the Haichenghe--Dayanghe fault.Both the 1975 Haicheng earthquake and the 1999 Haicheng--Xiuyan earthquake are the consequence under near horizontal,ENE--WSW compression,and the occurrence of the Haicheng--Xiuyan earthquake is the activities of a nearby Kangjialing fault under of influence the Haichenghe--Dayanghe fault.
An earthquake of MS5.4 occurred in Haicheng--Xiuyan area,Liaoning,northeastern China at 12:10:39 BJT(04:10:39 UTC)on November 29,1999.This event is the largest to occur since the 1975 Haicheng MS7.3 earthquake in Haicheng--Xiuyan area.The foreshocks,mainshock and aftershocks of the sequence were well-recorded by Liaoning Digital Seismic Network(LNDSN).Firstly,we used the regional distance travel time data recorded by the LNDSN to relocate the Haicheng--Xiuyan earthquake sequence by using double-difference earthquake location algorithm.Secondly,the earthquakes with well-recorded near-source recordings by Institute of Geophysics,China Earthquake Administration(IGCEA)and Southern Methodist University(SMU)Broadband Seismic Network(BSN)in the Haicheng--Xiuyan area are employed as ground truth(GT)events to calibrate the source parameters of the Haicheng--Xiuyan earthquake sequence.The obtained precise and accurate hypocentral distribution of the sequence clearly indicated that a nearby local Kangjialing fault is the seismogenic fault of the Haicheng--Xiuyan earthquake sequence.The WNW--ESE striking Kangjialing fault is nearly parallel to the Haichenghe--Dayanghe fault.Both the 1975 Haicheng earthquake and the 1999 Haicheng--Xiuyan earthquake are the consequence under near horizontal,ENE--WSW compression,and the occurrence of the Haicheng--Xiuyan earthquake is the activities of a nearby Kangjialing fault under of influence the Haichenghe--Dayanghe fault.
引文
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杨智娴,陈运泰,郑月军,于湘伟.2003.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学:D辑,33(增刊):129--134.
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Waldhauser F,Ellsworth WL.2000.Adouble-difference earthquake location algorithm:Method and application to thenorthern Hayward fault[J].Bull Seism Soc Amer,90(6):1353--1368.
Yang Z X,Waldhauser F,Chen Y T,Richards P.2005.Double-difference relocation of earthquakes in central-westernChina,1992—1999[J].Journal of Seismology,9(2):241--264.
邓起东,王挺梅,李建国,向宏发,程绍平.1976.关于海城地震震源模式的讨论[J].地质科学,(3):195--204.
顾浩鼎,陈运泰,高祥林,赵毅.1976.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,19(4):270--285.
高长波,钟以章.2000.1999年辽宁海城—岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,22(4):405--412.
卢造勋,刘国栋,魏梦华,孟朴在,赵俊猛.1990.中国辽南地区地壳与上地幔介质的横向不均匀性与海城地震[J].地震学报,12(4):367--378.
王安东,谷光裕,黄河,张颖.2003.1999年11月29日和2000年1月12日辽宁省海城—岫岩5.4级和5.1级地震[G]∥中国震例(1997—1999).北京:地震出版社:429--468.
杨智娴,陈运泰,郑月军,于湘伟.2003.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学:D辑,33(增刊):129--134.
杨智娴,陈运泰.2004.用双差地震定位方法再次精确测定1998年张北—尚义地震序列的震源参数[J].地震学报,26(2):1--6.
Waldhauser F,Ellsworth WL.2000.Adouble-difference earthquake location algorithm:Method and application to thenorthern Hayward fault[J].Bull Seism Soc Amer,90(6):1353--1368.
Yang Z X,Waldhauser F,Chen Y T,Richards P.2005.Double-difference relocation of earthquakes in central-westernChina,1992—1999[J].Journal of Seismology,9(2):241--264.
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