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利用重测定的震源深度特征探讨2013年吉林前郭5.8级震群发震因素

Discussion on Cause Factor of Jilin Qianguo M_S5.8 Earthquake Sequence in 2013 Using Focal Depth Characteristic of Relocation

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【作者】 刘双庆薛艳蔡宏雷谢静

【Author】 LIU Shuang-qing;XUE Yan;CAI Hong-lei;XIE Jing;Earthquake Administration of Tianjin Municipality;China Earthquake Networks Center;Earthquake Administration of Jilin Municipality;

【机构】 天津市地震局中国地震台网中心吉林省地震局

【摘要】 利用Pn-Pg震相组合的局部搜索法,采用5种地壳速度模型对2013年吉林前郭5.8级地震震群进行震源深度测定。计算结果显示,5种结果的震源深度的主要分布特征相似。对选取的32个地震震源深度进行重新测定,结果最小为6 km,最大14 km,主要集中在10 km左右,系统深度偏差约1.74 km,震源深度分辨率约1.58km,重定位后地震震中优势分布呈北西向。与当地的沉积层厚度分布对比,这些地震最有可能发生在盆地基底的基岩顶层,而不在油气圈闭的沉积盖层内,并且地震震群分布走向与通榆—长春断裂走向相一致。结合该地区的历史地震活动与构造关系,最后推测这些地震与北西向的通榆—长春断裂构造运动密切相关,而不是油田作业的直接产物。

【Abstract】 Using the local optimum search strategy of couple Pn-Pg phases algorithms,we determined the focal depth of Jilin Qianguo MS5. 8 earthquake sequence in 2013 by five different curst velocity models,and the calculation results indicate that the distribution characteristic of the 5 kinds of focal depth is consistency. The focal depths of the selected 32 earthquakes are relocated,the minimum and maximum focal depths are 6 km and 14 km respectively,most focal depths focus on 10 km. The systemic depth measure error may be 1. 74 km,and the resolution of focal depth may be about 1. 58 km. The advantage distribution of the relocated epicenters is in the NW direction. Compared with the thickness of local sedimentation in the study area,these earthquakes most probably occurred at the top of bed rock under the basin basement,rather than at the sediment overlying strata of oil field.M oreover,the preponderance direction of the distribution of these epicenters is consistent with the strike of Tongyu-Changchun Fault. Combined with the relationship between the local historical earthquakes and tectonic in the study area,we take a further speculation that the earthquake sequence maybe related with the tectonic activity of Tongyu-Changchun Fault in NW,rather than the direct production of the oil-field operation.

【基金】 中国地震局星火计划项目(XH14002Y);测震骨干青年专项(20130202);震情跟踪专项(2014010504);天津市国土局项目(1212011220232-5)联合资助
  • 【文献出处】 地震研究 ,Journal of Seismological Research , 编辑部邮箱 ,2015年02期
  • 【分类号】P315.33
  • 【被引频次】2
  • 【下载频次】51
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