2008 - 2018年地震观测揭示的中国海城隐伏断裂系发震构造

IF 2.6 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Bulletin of the Seismological Society of America Pub Date : 2023-08-23 DOI:10.1785/0120230046

Pengda Zhang, Z. Dai, Shi-King Yang, X. Zha

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引用次数: 0

摘要

海城隐伏断裂系是辽东半岛的地震易发带。其孕震构造尚不清楚，有待进一步研究。本文利用差分演化算法对2008年ML 4.8海城地震和2012年ML 4.8盖州地震波形资料进行反演，得到了更新后的一维地壳速度模型。模型显示海城断裂带下方存在深度为18 ~ 24 km的低速带。基于速度模型，利用到达时数据对海城地区2008 - 2018年发生的地震进行了精确定位。重新定位的地震结果表明，Az 300°走向的海城断裂由两段组成，即西段和东段，间隔约2 km。它们长约12公里，长约22公里，向东北倾斜，倾角分别为70°和80°。海城断裂带的这些发震构造对评估该地区未来的地震危险性具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Seismogenic Structure of the Hidden Haicheng Fault System in China Revealed by Seismic Observations from 2008 to 2018

The hidden Haicheng fault system is an earthquake-prone zone on the Liaodong Peninsula, China. Its seismogenic structure is still unclear and needs further study. In this study, we used the differential evolution algorithm to invert the waveform data of the 2008 ML 4.8 Haicheng earthquake and the 2012 ML 4.8 Gaizhou earthquake and obtained an updated 1D crustal velocity model. The model reveals a low-velocity zone with a depth of 18–24 km below the Haicheng fault zone. Based on the velocity model, we used the arrival-time data to accurately locate the earthquakes that occurred in the Haicheng area from 2008 to 2018. The relocated earthquakes show that the Az 300°-trending Haicheng fault consists of two segments spaced about 2 km apart, namely the western and the eastern segments. They are about 12 and 22 km long and inclined to the northeast with dips of 70° and 80°, respectively. These seismogenic structures of the Haicheng fault zone are important for assessing the future seismic risk in the region.

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来源期刊

Bulletin of the Seismological Society of America 地学-地球化学与地球物理

CiteScore

5.80

自引率

13.30%

发文量

140

审稿时长

3 months

期刊介绍： The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.