【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.更多还原

【Abstract】 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.更多还原