基于线性密集台阵的2023年甘肃积石山MS6.2地震断层低速带研究
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吴柏辰(1999-),男,硕士研究生,主要从事密集台阵与断层结构研究。E-mail:523402038@qq.com。

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国家自然科学基金重点项目(42230305);甘肃省科技重大专项(21ZD4FA011);国家重点研发计划课题(2018YFC1503206)


Low-velocity fault zone of the 2023 Jishishan Gansu MS6.2 earthquake based on linear dense array data
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    摘要:

    2023年12月18日,甘肃省积石山县发生MS6.2逆冲型地震。该地震发生在祁连活动地块拉脊山北缘断裂带,在断裂两侧曾发生过20余次5级左右中强地震,地震活动频次高,因此研究拉脊山断裂带特征具有重要意义。根据拉脊山断裂走向和此次地震余震分布,在刘集乡布设一条线性密集台阵,利用不同方位的余震事件计算体波的走时延时和放大效应。结果表明,P波和S波分别存在6个采样点(约0.012 s)和15个采样点(约0.03 s)的走时延时,推断出台阵西侧存在一个约150 m宽近似垂直的断层低速带,且该结果与远震P波相似性系数矩阵结果一致。

    Abstract:

    On December 18, 2023, an MS6.2 reverse-type earthquake struck Jishishan County, Gansu Province, along the northern margin of the Lajishan fault zone, Qilian active block. Given that over 20 M5.0 earthquakes have occurred on both sides of the Lajishan fault, investigating its characteristics is paramount. Thus, based on the strike of the Lajishan fault and its aftershock distribution, we deployed a linear dense array in Liuji Town. Considering aftershock events in different directions, we determined travel time delays and amplification effects of body waves. The results identified six (approximately 0.012 s) and 15 (approximately 0.03 s) sampling points of travel time delays for the P-and S-waves, respectively. This confirmed the presence of a nearly vertical low-velocity zone with a width of approximately 150 m along the west side of the array. The obtained results align with teleseismic P-wave similarity coefficient matrix calculations.

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吴柏辰,秦满忠,郭晓,王亚红,孙点峰,温淑琳.基于线性密集台阵的2023年甘肃积石山MS6.2地震断层低速带研究[J].地震工程学报,2024,(3):734-741. WU Baichen, QIN Manzhong, GUO Xiao, WANG Yahong, SUN Dianfeng, WEN Shulin. Low-velocity fault zone of the 2023 Jishishan Gansu MS6.2 earthquake based on linear dense array data[J]. China Earthquake Engineering Journal,2024,(3):734-741.

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  • 收稿日期:2024-03-06
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  • 在线发布日期: 2024-05-17