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| Kanto inland seismic zone | |
|---|---|
| Name | Kanto inland seismic zone |
| Country | Japan |
| Region | Kantō |
| Coordinates | 35°N 139°E |
| Type | Intracontinental seismic zone |
| Notable events | 1923 Great Kantō earthquake, 1894 Tokyo earthquake, 1855 Ansei Edo earthquake |
| Plate | Eurasian Plate, Philippine Sea Plate |
Kanto inland seismic zone is an intraplate seismic region beneath the Kantō Plain of central Honshū, Japan, affecting Tokyo, Yokohama, Saitama, Chiba, and surrounding prefectures. It lies within the complex convergent margin involving the Eurasian Plate, Philippine Sea Plate, and Pacific Plate, contributing to seismic hazard across the Kantō region, Kanto Plain, and the Izu Islands arc. The zone has been the focus of extensive study by institutions such as the Japan Meteorological Agency, the University of Tokyo, the Geological Survey of Japan, and the National Research Institute for Earth Science and Disaster Resilience.
The zone occupies the inland portion of the Kantō Plain bounded by the Tama River, Arakawa River, Tone River, the Bōsō Peninsula, and the Miura Peninsula, with bedrock exposures in the Chichibu Mountains and the Tama Hills. It overlies fault systems related to interactions among the Izu–Bonin–Mariana Arc, the Sagami Trough, the Nankai Trough, and the subducting Pacific Plate beneath eastern Honshū and the Philippine Sea Plate beneath Honshū. Tectonic models incorporate findings from the Japan Trench studies, Seismic Tomography projects at the Earthquake Research Institute, and GPS networks run by the Geospatial Information Authority of Japan and the MEXT.
Instrumental and historical records link the zone to events such as the 1923 Great Kantō earthquake, the 1855 Edo earthquake, and the 1894 Tokyo earthquake. Paleoseismology trenches correlated with archives from the Tokugawa shogunate era and Meiji period documents show recurring surface ruptures and liquefaction documented in Edo chronicles and municipal records of Yokosuka, Kawasaki, and Kamakura. Seismic catalogs compiled by the International Seismological Centre, the United States Geological Survey, and the Japan Meteorological Agency show a pattern of moderate to large events, clustered swarms like those observed near Matsudo and Tachikawa, and induced seismicity linked to reservoir and urban loading studied by researchers at Tohoku University and the Meteorological Research Institute.
Major mapped faults include strands correlated with the Tsurumi fault, the Neodani fault-style segments in local nomenclature, and hidden reverse and strike-slip faults beneath urban sedimentary basins such as the Tokyo Bay basin and the Sakura paleo-valley. Geological mapping by the Geological Survey of Japan and borehole data from the Japan Oil, Gas and Metals National Corporation reveal Quaternary deposits, Holocene uplift, and cryptic blind-thrust systems analogous to faults studied near Niigata and Kumamoto. Structural interpretations draw on analogues from the Median Tectonic Line and the Itoigawa-Shizuoka Tectonic Line but emphasize intracontinental deformation, folding, and strike-slip partitioning documented in seismic reflection profiles acquired by the Japan Agency for Marine-Earth Science and Technology.
Seismic monitoring in the zone is conducted by the Japan Meteorological Agency, the National Research Institute for Earth Science and Disaster Resilience, the University of Tokyo (Earthquake Research Institute), and networks such as Hi-net, K-NET, and KiK-net. Dense arrays capture microseismicity, focal mechanisms, and attenuation parameters, while GPS and InSAR campaigns by the Geospatial Information Authority of Japan and the Japan Aerospace Exploration Agency resolve crustal deformation. International collaborations include projects with the United States Geological Survey, the European Space Agency, and the International Ocean Discovery Program to refine seismic hazard models, paleoseismic chronologies, and dynamic rupture simulations developed at centers like the California Institute of Technology and Massachusetts Institute of Technology.
Hazards associated with the zone include strong ground shaking, surface rupture, liquefaction in reclaimed areas such as Tokyo Bay and Yokohama Bay, slope failure in the Tama Hills and Bōsō Peninsula, and compound scenarios that interact with tsunami risk from the Sagami Trough and the Nankai megathrust. Risk assessments by the Cabinet Office (Japan), municipal governments of Tokyo Metropolitan Government, Kanagawa Prefecture, and academic teams from Keio University and Waseda University incorporate exposure of critical infrastructure: Haneda Airport, Narita International Airport, the Tōkaidō Shinkansen, port facilities at Yokohama Port, and lifelines operated by Tokyo Electric Power Company Holdings and East Japan Railway Company. Insurance modeling uses probabilistic seismic hazard analysis (PSHA) frameworks informed by the Earthquake Early Warning system and scenario planning from the Central Disaster Management Council.
Preparedness measures include retrofitting of buildings under standards developed by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), emergency planning by the Tokyo Metropolitan Government Disaster Prevention Bureau, community drills organized by neighborhood associations and Japanese Red Cross Society chapters, and public education campaigns by NHK and the Japan Broadcasting Corporation. Mitigation strategies combine structural retrofitting of schools and hospitals, land-use planning enforced by prefectural governments of Kanagawa Prefecture, Chiba Prefecture, Saitama Prefecture, and implementation of early warning systems by the Japan Meteorological Agency and private sector partners such as SoftBank and NTT DOCOMO. Ongoing research into resilient design engages firms like Takeda Corporation and academic centers including the Disaster Prevention Research Institute (Kyoto University).
Category:Seismic zones of Japan