2022年青海门源6.9级地震引起的地表同震位移场研究
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周卓群(1998-),男,硕士研究生,主要从事地下结构抗震研究方面的工作,E-mail:2108590020119@stu.bucea.edu.cn

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国家自然科学基金(51708018,12172036);北京市教委科研项目-科技计划一般项目(KM202010016016);北京建筑大学“建大英才计划”(JDYC20200308)


Co-seismic surface displacement field caused by the Menyuan,Qinghai MS6.9 earthquake in 2022
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    摘要:

    中国青海省门源县于2022年1月8日发生6.9级地震。依据该地震震源断层信息设置4种不同的位错分布模式,基于Okada提出的地表位移解析解分别计算4种模式下地表同震位移场,结合现场观测数据,探讨发震断层的滑动形式及其对周边地表产生的影响。结果表明,此次地震发震断裂初步判断主要为冷龙岭断裂西侧延伸至托莱山断裂,以左旋走滑断层为主,断层面上最大位错量达到4 m左右;震中西南侧向NE方向运动,东南侧向SE方向运动,西北侧和东北侧分别向NW以及SW方向运动;震中附近小范围区域产生了超过1.5 m的地表水平位移,破裂带上存在竖向地表位移超过0.5 m的区域;现场监测到局部产生最大约2.1~2.3 m的水平位错,以及部分区段垂直位错量最大达到0.7 m;以震中位置为中心,断层引起的地表位移影响范围达到约30 km×36 km,此范围内产生的地表位移大于0.1m。研究为此次地震的震后恢复工作以及此区域后续的工程设防等提供参考。

    Abstract:

    On January 8th, 2022, an MS6.9 earthquake occurred in Menyuan Country, Qinghai Province. To study the co-seismic surface displacement caused by the Menyuan earthquake, we proposed four different dislocation models based on the data of seismogenic fault, and four co-seismic surface displacement fields induced by the Menyuan earthquake were calculated with the analytical solution of surface displacement proposed by Okada. Combined with the field observation data, the sliding form of the seismogenic fault and the associated effect on the surrounding surface were discussed. The results show that the the west side of Lenglongling fault extending to the Tolaishan fault is preliminarily judged as the seismogenic fault of the earthquake. The fault is dominated by left-lateral strike-slip, and the maximum dislocation on the fault reaches about 4 m. Southwest surface of the epicenter moves in the NE direction, and the southeast side moves in the SE direction; the northwest and northeast sides move in the direction of NW and SW, respectively. A small area near the epicenter has a horizontal surface displacement of more than 1.5 m, and there is a vertical surface displacement of more than 0.5 m along the rupture zone. In-situ monitoring results show that the maximum horizontal dislocation is about 2.1~2.3 m, and the maximum vertical dislocation in some areas reaches 0.7 m. Taking the epicenter as the center, the influence range of surface displacement caused by fault is about 30 km × 36 km, and the surface displacement within this range is greater than 0.1 m. The study can provide a reference for the post-earthquake recovery and the subsequent project fortification in this area.

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周卓群,夏晨,李震,戚承志.2022年青海门源6.9级地震引起的地表同震位移场研究[J].地震工程学报,2022,44(3):727-734,743. ZHOU Zhuoqun, XIA Chen, LI Zhen, QI Chengzhi. Co-seismic surface displacement field caused by the Menyuan, Qinghai MS6.9 earthquake in 2022[J]. China Earthquake Engineering Journal,2022,44(3):727-734,743.

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  • 在线发布日期: 2022-06-08