1987 Chiba earthquake

Earthquake near Tokyo, Japan 1987 Chiba earthquake 千葉県東方沖地震 ja December 17, 1987 11:08 1987-12-17 02:08:19 usp0003bbq 450774 Japan Chiba Prefecture#Japan 7.3 e yM 6.7 - 10 km SW of Mobara, Japan - Technical Summary https://earthquake.usgs.gov/earthquakes/eventpage/usp0003bbq/technical United States Geological Survey6.7 w yM 6.7 - 10 km SW of Mobara, Japan https://earthquake.usgs.gov/earthquakes/eventpage/usp0003bbq/executive United States Geological Survey 62.9 km on 35.372 140.519Okada Y. Kasahara K. 1990 Earthquake of 1987, off Chiba, central Japan and possible triggering of eastern Tokyo earthquake of 1988 Tectonophysics 172 3–4 351–364 10.1016/0040-1951(90)90041-6 1990Tectp.172..351O 5-https://www.data.jma.go.jp/svd/eqdb/data/shindo/index.html#19871217110816 震度データベース検索 2022-04-11 気象庁VII Strike-slip 2 dead, 144 injured The 1987 Chiba Prefecture offshore earthquake (Japanese: 千葉県東方沖地震) occurred off the east coast of the Boso Peninsula in Chiba Prefecture at 11:08:01 JST on December 17, 1987. Tectonic setting The crustal structure in the southern Kantō region is complex, involving boundaries between three tectonic plates. The Philippine Sea plate is subducting beneath the Okhotsk plate along the line of the Sagami Trough and beneath the Eurasian plate along the line of the Nankai Trough. Further to the east, the Pacific plate is subducting beneath the Okhotsk and Philippine Sea plates along the line of the Japan Trench. A velocity analysis of the region beneath Kanto suggests that the wedge of oceanic mantle lithosphere of the Philippine Sea plate in contact with the Pacific plate is affected by serpentinization as shown by the anomalously low seismic velocity. The boundary between the serpentinized and unmetamorphosed parts of the mantle wedge is interpreted to be vertical and NNW–SSE trending.Nakajima J. Hasegawa A. 2010 Cause of M ~ 7 intraslab earthquakes beneath the Tokyo metropolitan area, Japan: Possible evidence for a vertical tear at the easternmost portion of the Philippine Sea slab Journal of Geophysical Research: Solid Earth 115 B4 10.1029/2009JB006863 2010JGRB..115.4301N free Earthquake The earthquake had a strike-slip focal mechanism, which with its depth, indicates that it was a result of faulting within the Philippine Sea plate. The focal mechanism gives two possible fault planes, one west–east trending, dipping steeply to the south, and the other north–south trending, dipping steeply to the east. The distribution of aftershocks suggests a NNW–SSE trending rupture, consistent with the nearly north–south fault plane, indicating dextral (right-lateral) strike-slip faulting with a small component of reverse faulting. The earthquake is interpreted to have ruptured part of the boundary between the two parts of the Philippine Sea plate mantle wedge. Damage According to the materials of the Fire and Disaster Prevention Division of the Chiba Prefecture General Affairs Department, two deaths (one in Mobara and another in Ichihara), 26 serious injuries and 118 minor injuries were reported. 16 buildings collapsed, 102 were severely damaged, and 63,692 suffered minor damage. Three fires, power outages, and train service disruptions were also reported.http://www.hiroi.iii.u-tokyo.ac.jp/index-houkokusho-rist-tibaken.pdf 1987年千葉県東方沖地における災害情報の伝達と市町村・住民の対応] 東京大学社会情報研究所廣井研究室 1987 Transmission of disaster information off the east coast of Chiba Prefecture and response of municipalities and residents Hiroi Laboratory, Institute of Social Information, University of Tokyo 2022-04-11 2016-03-05 https://web.archive.org/web/20160305005417/http://www.hiroi.iii.u-tokyo.ac.jp/index-houkokusho-rist-tibaken.pdf dead千葉県東方沖地震による山地災害とその対応 -その後 地すべり Vol.26 (1989-1990) No.1 P.41-43, 10.3313/jls1964.26.41 Liquefaction was observed on landfills and riverbanks. Even though most of the damage occurred in Chiba Prefecture, damage and landslides were also reported in Kanagawa Prefecture.久保 徹：千葉県東方沖地震に伴う三浦半島の被害状況 地すべり Vol.24 (1987-1988) No.4 P.39-40, 10.3313/jls1964.24.4_39https://www.upi.com/Archives/1987/12/17/Earthquake-in-Japan-kills-two-injures-53/6188566715600/ Earthquake in Japan kills two, injures 53 Butts David December 17, 1987 April 12, 2022 United Press Internationalhttps://typhoon.yahoo.co.jp/weather/calendar/127/ 千葉県東方沖地震 Chiba Prefecture East Offshore Earthquake April 12, 2022 typhoon.yahoo.co.jp ja See also List of earthquakes in 1987 List of earthquakes in Japan 2012 Chiba earthquake 2021 Chiba earthquake References Category:1987 earthquakes Category: Earthquakes in Japan Category:1987 in Japan Category:History of Chiba Prefecture 1987 Category:Chiba Prefecture Category:December 1987 in Japan