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ISSN 2096-7780 CN 10-1665/P

张蓓蕾, 彭骁. 皎口水库地震精定位、震源机制及发震机理探讨 [J]. 地震科学进展, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2022-110.
引用本文: 张蓓蕾, 彭骁. 皎口水库地震精定位、震源机制及发震机理探讨 [J]. 地震科学进展, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2022-110.
Zhang Beilei, Peng Xiao. Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes [J]. Progress in Earthquake Sciences, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2022-110.
Citation: Zhang Beilei, Peng Xiao. Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes [J]. Progress in Earthquake Sciences, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110" target="_blank" class="mainColor"> 10.19987/j.dzkxjz.2022-110.

皎口水库地震精定位、震源机制及发震机理探讨

Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes

  • 摘要: 利用双差定位法对宁波皎口水库2009—2021年地震进行重新定位,通过HASH方法计算了较大地震的震源机制解,基于精确定位后的地震震源位置分布、深度分布以及总体震源机制解特征,结合区域地质构造背景、库区地质条件以及水库水位变化,对发震构造及孕震机理进行探讨。结果表明,皎口水库2009—2012年地震序列与2018—2021年地震序列孕震机理相似,区域性断裂长兴—奉化可能为发震断层;库水通过断裂破碎带下渗,孔隙水压力扩散及库水对岩石的软化弱化长时间作用,造成断层面及其深部某些薄弱部位变为不稳定区域,最后在库水变化导致的加卸荷应力场作用下触发地震。

     

    Abstract: Jiaokou reservoir earthquakes in Ningbo from 2009 to 2021 were relocated using the double difference positioning method. The focal mechanism solutions of large earthquakes were calculated by HASH method. Based on the location distribution, depth distribution and overall focal mechanism solution characteristics of the earthquakes after precise positioning, the seismogenic structure and seismogenic mechanism were discussed by combining with the regional geological tectonic background, geological conditions in the reservoir area and the change of reservoir water level. The results show that the seismogenic mechanism of the Jiaokou reservoir earthquake sequence in 2009—2012 is similar to that in 2018—2021, and the regional fault Changxing—Fenghua may be the seismogenic fault. The reservoir water infiltrates through the fracture fracture zone, the pore water pressure diffuses, the reservoir water softens and weakens the rock for a long time, causing the fault plane and some weak parts in the deep part to become unstable areas, and finally triggering the earthquake under the loading and unloading stress field caused by the change of reservoir water.

     

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