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首页> 外文期刊>Earth, planets and space: EPS >Resistivity and density modelling in the 1938 Kutcharo earthquake source area along a large caldera boundary
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Resistivity and density modelling in the 1938 Kutcharo earthquake source area along a large caldera boundary

机译：1938年Kutcharo地震震源区大火山口边界的电阻率和密度模拟

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摘要

We present the crustal structure around the fault zone pertaining to the 1938 Kutcharo earthquake (M 6.0), northern Japan, to consider why large earthquakes have occurred around calderas. The study was based on gravity anomalies and magnetotelluric and direct-current (DC) electrical-resistivity survey data. The density structure obtained from gravity anomalies indicated that the fault plane corresponded to the main depression boundary of the Kutcharo caldera. The resistivity section, based on audio-frequency magnetotelluric surveys, indicated that the estimated fault plane was located along the boundary of resistivity blocks, which also corresponded to the depression boundary. A detailed resistivity section in the ruptured zone revealed by a DC electrical-resistivity survey showed a discontinuity of layers, implying cumulative fault displacements. These results indicate that the 1938 earthquake was an abrupt slip along the main depression boundary of the Kutcharo caldera. The most likely hypothesis pertains to fluid intrusion along the depression boundary. However, additional seismic and geodetic studies are required to identify other feasible earthquake mechanisms.
机译：我们介绍了与1938年日本北部喀彻罗地震（M 6.0）有关的断层带周围的地壳结构，以考虑为何在火山口附近发生了大地震。该研究基于重力异常以及大地电磁和直流（DC）电阻率调查数据。从重力异常获得的密度结构表明，断层平面对应于卡尔查罗破火山口的主要凹陷边界。基于音频大地电磁测量的电阻率部分表明，估算的断层位于沿电阻率块的边界，该边界也对应于depression陷边界。直流电阻率测量显示的破裂区域中的详细电阻率部分显示各层不连续，这意味着累积的断层位移。这些结果表明，1938年的地震是沿着Kutcharo破火山口的主要洼地边界突然滑移的。最可能的假设与沿凹陷边界的流体侵入有关。但是，还需要进行其他地震和大地测量研究才能确定其他可行的地震机制。

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