A 3D electrical resistivity model around the focal zone of the 2017 southern Nagano Prefecture earthquake (MJMA 5.6): implications for relationship between seismicity and crustal heterogeneity

Ichihara, Hiroshi; Kanehiro, Junna; Mogi, Toru; Yamaoka, K.; Tada, Norio; Bertrand, E. A.; Adachi, Mamoru

doi:10.1186/s40623-018-0950-1

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…5 and 6 ) shows that the hypocenters are mostly clustered near boundaries between lower and higher values of resistivity and Vs. This result is consistent with previous studies finding that earthquakes are often observed in the vicinity of resistive and conductive zones, specifically within more-resistive rocks 33 – 35 . This suggests that geothermal fluids migrate along lithological boundaries, which commonly concentrate stress and develop fractures or cracks that favor fluid migration.…”

Section: Discussionsupporting

confidence: 93%

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Andajani

Tsuji

Ikeda

et al. 2023

Sci Rep

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Continuous seismic monitoring could play a pivotal role in deep geothermal energy exploration. We monitored seismicity near geothermal production areas of the Kuju volcanic complex with a dense seismic network and automated event detection. Most events were shallow (less than 3 km below sea level) and distributed along a boundary between regions of high and low resistivity and S-wave velocity, interpreted as a lithological boundary or related fracture zone. Deeper events located on top of subvertical conductors may reflect fracturing associated with magmatic fluid intrusion. A correlation may exist between seismicity and heavy rainfall three days prior to increased pore pressure in pre-existing fractures. Our findings support the presence of supercritical geothermal fluids and demonstrate the importance of continuous seismic monitoring in supercritical geothermal energy exploration.

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Section: Discussionsupporting

confidence: 93%

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Andajani

Tsuji

Ikeda

et al. 2023

Sci Rep

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show abstract

“…5 and 6) shows that the hypocenters are mostly clustered near boundaries between lower and higher values of resistivity and Vs. This result is consistent with previous studies nding that earthquakes are often observed in the vicinity of resistive and conductive zones, speci cally within more-resistive rocks [33][34][35] . This suggests that geothermal uids migrate along lithological boundaries, which commonly concentrate stress and develop fractures or cracks that favor uid migration.…”

Section: Discussionsupporting

confidence: 93%

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Andajani

Tsuji

Ikeda

et al. 2023

Preprint

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Continuous seismic monitoring could play a pivotal role in deep geothermal energy exploration. We monitored seismicity near geothermal production areas of the Kuju volcanic complex with a dense seismic network and automated event detection. Most events were shallow (less than 3 km below sea level) and distributed along a boundary between regions of high and low resistivity and S-wave velocity, interpreted as a lithological boundary or related fracture zone. Deeper events located on top of subvertical conductors may reflect fracturing associated with magmatic fluid intrusion. We attribute a possible correlation between seismicity and heavy rainfall three days prior to increased pore pressure in pre-existing fractures. Our findings support the presence of supercritical geothermal fluids and demonstrate the importance of continuous seismic monitoring in supercritical geothermal energy exploration.

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“…As the 3D inversion technique has matured in recent years, the 3D resistivity model is more reliable than the 2D model. The MT method has played an essential role in identifying seismogenic structures and constructing earthquake dynamic models in the complex structural zone (Aizawa et al., 2016; Azeez et al., 2020; Cai et al., 2017; Ichihara et al., 2018; Yamaya et al., 2017; T. Ye et al., 2021; Zhan et al., 2021). We did planar MT exploration and produced a reliable high‐resolution 3D electrical structure using 3D inversion including topography to study the Tangshan earthquake's seismogenic structure and formation mechanism.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China

Cai¹,

Chen²,

Dong

et al. 2023

Geophysical Research Letters

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earthquake struck nearby Luanxian and Ninghe in the afternoon of the same day and on 15 November. The Tangshan earthquake was the largest in eastern China in the previous 300 years. A rare earthquake occurred directly beneath the city and had the highest number of fatalities in the 20th century. It has killed over 240,000 people and caused massive economic and social disruptions (X. W. . The Tangshan earthquake occurred at the intersection of Yanshan Mountain's southern margin and the NCP. It is situated at the intersection of the Northwest (NW) trending Zhangjiakou-Bohai-Penglai seismic belt (ZBPSB) and the Northeast (NE) trending Tangshan-Hejian-Cixian seismic belt (THCSB, Figure 1a) (J. Xu & Ji, 2017). According to historical earthquakes and paleo-earthquake research, there is a ∼160 km seismic gap along the THCSB near Tianjin. In the future, an earthquake with a magnitude greater than 7.5 is possible (Yin et al., 2015), which suggests that China's densely populated and economically developed Beijing-Tianjin-Tangshan region must continue to prioritize the risk of large earthquakes.

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A 3D electrical resistivity model around the focal zone of the 2017 southern Nagano Prefecture earthquake (MJMA 5.6): implications for relationship between seismicity and crustal heterogeneity

Cited by 8 publications

References 22 publications

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Tracking supercritical geothermal fluid distribution from continuous seismic monitoring

Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China

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