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2008年3月21日新疆于田7.4级地震序列特征及震前部分地震学异常特征
聂晓红,李莹甄
作者单位
聂晓红 新疆维吾尔自治区地震局 乌鲁木齐 830011 
李莹甄 新疆维吾尔自治区地震局 乌鲁木齐 830011 
摘要:
介绍了2008年3月21日新疆于田7.4级地震的基本参数、震区周围应力场背景及构造、地震序列特征等,分析了震前震区周围及相邻构造区域地震活动特征,对比分析于田序列和其后发生的汶川8.0级和乌恰6.9级地震的关系。结果显示,于田7.4级地震发生在阿尔金断裂与西昆仑断裂的交汇部位,可能是阿尔金断裂发生左旋扭错,牵引其西南端位于阿什库勒盆地的分支断裂发生张性破裂的结果。该地震序列为主-余型,最大余震为MS5.8,余震衰减较快,且具有一定的成丛性。震源机制解和震中分布可以看出,该地震具有单侧破裂特征。地震活动表明震前存在明显的中期和中短期异常,但未有短临异常出现。在汶川8.0级和乌恰6.9级地震前,该序列出现显著增强活动,具有一定的窗口效应。
关键词:  于田7.4级地震  序列特征  地震活动特征  窗口效应
DOI:
分类号:
基金项目:
Seismic Sequence Characteristics of the March 21, 2008, M7.4 Yutian, Xinjiang Earthquake and Seismological Anomalies before the Earthquake
Nie Xiaohong,Li Yingzhen
Abstract:
The parameters, stress field background, geological tectonics and seismic sequence of the March 21, 2008, MS7.4 Yutian, Xinjiang earthquake are discussed in this paper. The characteristics of seismic activity in the epicenter and its adjacent region before the earthquake are analyzed; and a comparison is made between the MS7.4 Yutian earthquake sequence, the Wenchuan MS8.0 earthquake sequence and the Wuqia MS6.9 earthquake sequence. The results show the MS7.4 Yutian earthquake occurred in the junction between the Altyn Tagh fault and the western Kunlun fault, resulting perhaps from the tensile fracture of the branch fault located southwest of the Ashikule basin due to left-1ateral dislocation of the Altyn Tagh fault;; the seismic sequence is of main shock-aftershock type, the strongest aftershock being MS5.8. The aftershocks attenuated quickly, and occurred in groups;; the focal mechanism solutions and epicenter distribution have revealed a unilateral rupture source of this earthquake. Seismic activity shows that there was medium and medium-short term abnormity before the earthquake, but there was not short-imminent abnormity. Seismic activity of this earthquake sequence enhanced before the MS8.0 Wenchuan and the MS6.9 Wuqia earthquakes, showing the window effect to some extent.
Key words:  MS7.4 Yutian earthquake    Sequence characteristic    Seismic activity characteristics    Window effect