Three‐Dimensional Pore Fluid Pressures in Source Region of 2017 Pohang Earthquake Inferred From Earthquake Focal Mechanisms
Three‐Dimensional Pore Fluid Pressures in Source Region of 2017 Pohang Earthquake Inferred From Earthquake Focal Mechanisms
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DOI：
10.1029/2019gl085964
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发表时间：
2020-05
影响因子：
5.2
通讯作者：
T. Terakawa;W. Seo;Kwang‐hee Kim;J. Ree
中科院分区：
文献类型：
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作者：
T. Terakawa;W. Seo;Kwang‐hee Kim;J. Ree
我们分析了 91 个震源重新定位的震源机制数据，利用震源机制层析成像方法估算了 2017 年韩国浦项地震震源区的 3D 孔隙流体压力场。强化地热系统西北部位置的孔隙流体压力上限为8±3 MPa。超压流体位于致因断层的下盘。它直接连接到 PX2 的裸眼井部分，向该孔注入液体可能引发主震。
We analyzed 91 focal mechanism data with relocated hypocenters to estimate the 3‐D pore fluid pressure field in the source region of the 2017 Pohang earthquake in South Korea using the method of focal mechanism tomography. The upper limit of pore fluid pressure was 8 ± 3 MPa in a location northwest of the enhanced geothermal system. The overpressurized fluids were localized in the footwall of the causative fault. It was directly connected to the open hole section of PX2, and fluid injection into this hole could have triggered the mainshock.