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2014年新疆于田MS7.3地震序列和震源特征初步分析
孟令媛 周龙泉 史海霞
中国地震台网中心,北京市西城三里河南横街5号100045
摘要:
2014年2月12新疆于田发生MS7.3地震,震中位置36.1°N,82.5°E,震源深度约17km,于田地震发生在西昆仑断裂与阿尔金断裂交汇区内,基于远震波形记录反演的震源机制为走滑型,此次地震破裂比较集中,滑动主要分布在深部,破裂未出露地表。截至2014年2月23日12时00分,于田MS7.3地震序列中2、3级地震较为丰富,衰减较为正常,b值约为0.7,h值为1.29,等待时间法显示4.5级以上余震遵从线性关系,符合以往主-余型地震的特征。基于由断层面上滑动位移反演结果和震源参数计算得到的经验关系认为,于田地震的动态破裂过程为应力下调模式,即地震能量的释放可能并不十分完全,这与该地震b值小于2008年于田7.3级、2012年于田6.2级地震的b值相符。
关键词:  于田MS7.3地震  地震序列  震源参数
DOI:
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A Study on the Characteristics of the Yutian,Xinjiang MS 7. 3 Earthquake,February 12,2014
Meng Lingyuan,Zhou Longquan,Shi Haixia
Abstract:
The February 12,2014,MS 7. 3,earthquake in Yutian,Xinjiang,China,occurred as a result of shallow strike-slip faulting in the tectonically complex region of the northern Tibetan Plateau,with a depth of 17km. This earthquake occurred several hundred kilometers north of the convergent India-Eurasia plate boundary. The epicenter location of the Yutian earthquake,36. 1° N,82. 5° E,is 110km north of Yutian County,Hotan Prefecture. A large number of aftershocks from ML 2. 0 to ML 3. 0 occurred until 12:00 oclock,February 23,2014 and the largest aftershock,MS5. 7,occurred at 17:24 p. m. , February 12,2014. The b and h value of Yutian sequence are 0. 70 and 1. 29, respectively. The waiting time method reveals that the strong aftershocks above ML 4. 5 comply with a linear relationship,which is consistent with the characteristics of a mainshock-aftershock sequence. Furthermore,we calculate the source parameters and analyze the rupture process based on the empirical relationships for the Yutian earthquake,and the results indicate a frictional undershoot behavior in the dynamic source process of the Yutian earthquake,which is also in agreement with the lower and similar b values compared with the 2008 MS 7. 3 Yutian earthquake and the 2012 MS 6. 2 Yutian earthquake.
Key words:  Yutian MS7. 3 earthquake  Earthquake sequence  Source parameters