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中村 謙佑*; 相澤 広記*; 浅森 浩一; 大志万 直人*; 塩崎 一郎*; 2001年地殻比抵抗研究グループ*
no journal, ,
将来の地層処分システムに重大な影響を及ぼす可能性がある地震活動や火山活動の潜在的なリスクを適切に評価するためには、これらの自然現象と地殻内の流体やマグマといった不均質構造との関連性についての理解が必要である。本研究では、2000年鳥取県西部地震の震源域における詳細な比抵抗構造と断層すべり分布との関連性を検討するため、既往の研究に使用された広帯域電磁探査データに観測データをさらに加えて比抵抗構造解析を行った。
中村 謙佑*; 相澤 広記*; 浅森 浩一; 大志万 直人*; 塩崎 一郎*; 2001年地殻比抵抗研究グループ*
no journal, ,
We show the resistivity structure around the focal region of the 2000 Western Tottori Earthquake (M7.3). The purpose of this study is to investigate the relationship between the rupture of the mainshock and the resistivity structure. In particular, we focus on the resistivity structure around the zones where the rupture started and arrested. In previous study, 3-D resistivity structure around the focal region was determined using 52 broad-band MT sites. In addition to the 52 sites, we added 12 broad-band MT sites. We recalculate the MT response functions and used full components of the impedance tensor and geomagnetic transfer functions to image three-dimensional resistivity structure. The new points of the analysis are summarized as follows. (1) re-calculation of MT response functions. (2) using full impedance tensor and geomagnetic transfer functions in three-dimensional inversion. (3) including oceans in three-dimensional inversion.
中村 謙佑*; 相澤 広記*; 浅森 浩一; 大志万 直人*; 井上 智裕*; 臼井 嘉哉*; 市原 寛*; 山口 雅弘*; 宇都 智史*; 畑岡 寛*; et al.
no journal, ,
We present the resistivity structure around the focal region of the 2000 Western Tottori Earthquake (M7.3) to investigate the relationship between the mainshock rupture and the resistivity stricture. The Western Tottori Earthquake occurred on October 6, 2000, in an area without surface faulting. Deep low-frequency earthquakes were observed approximately 8 km west of the epicenter at depths of around 30 km. To obtain a detailed resistivity structure, we conducted additional observations at 35 sites between October and December 2024, including 21 telluric-only sites. For our three-dimensional resistivity analysis, we utilized MT data from 52 sites used in previous study, 12 sites observed in 2001 by Kyoto University and Tottori University, and the newly added 35 sites. As a result, we identified a low-resistivity zone directly beneath the epicenter. We discuss the relationship between this resistivity structure, the slip distribution of the mainshock, and the occurrence of aftershocks.