Genesis of Intermediate‐Depth and Deep Intraslab Earthquakes beneath Japan Constrained by Seismic Tomography, Seismicity, and Thermal Modeling

Genesis of Intermediate‐Depth and Deep Intraslab Earthquakes beneath Japan Constrained by Seismic Tomography, Seismicity, and Thermal Modeling
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受地震层析成像、地震活动和热模拟约束的日本地下中深度和深层板内地震的成因

DOI:
10.1029/2018gl080025
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发表时间:
2019
影响因子:
5.2
通讯作者:
Kiser, Eric
Kiser, Eric
中科院分区:
地球科学1区
文献类型:
--
作者:
Chen, Min;Manea, Vlad Constantin;Niu, Fenglin;Wei, S. Shawn;Kiser, Eric

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相对于俯冲板块的中深度和深的实验室内地震的分布提供了对高压和高温下地震成因的独特见解,这应该抑制脆性破坏。这项研究基于先前的大陆尺度伴随层析成像模型,将日本下方俯冲太平洋板块的表面限制在100至380公里的深度。相对于板块表面的地震分布揭示了位于太平洋板块顶部60公里内的双地震带。热模拟表明,低平面地震活动对应于400至900 °C之间的温度。孕震压力和温度条件与几种含水矿物的脱水反应条件大致相关,即叶蛇纹石(蛇纹石)和蛇纹石在100和200公里之间的深度和阶段A在更大的深度之间200和380公里。这些相关性表明,在这些深度从脱水过程中释放的水可能有助于触发板幔地震。
The distribution of intermediate‐depth and deep intraslab earthquakes with respect to subducting slabs offers a unique insight into seismogenesis at high pressures and temperatures that should inhibit brittle failure. This study constrains the surface of the subducting Pacific Plate beneath Japan at depths between 100 and 380 km based on a previous continental‐scale adjoint tomography model. Earthquake distributions relative to the slab surface reveal double seismic zones located within the top 60 km of the Pacific Plate. Thermal modeling suggests that the lower‐plane seismicity corresponds to temperatures between 400 and 900 °C. The seismogenic pressure and temperature conditions correlate approximately with the conditions of dehydration reactions of several hydrous minerals, that is, antigorite (serpentine) and chlorite at depths between 100 and 200 km and phase A at greater depths between 200 and 380 km. These correlations indicate that at these depths water released from dehydration processes may facilitate triggering slab mantle earthquakes.
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