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| 福岡県西方沖地震 | |
 JMA seismic intensity map | |
   | |
| UTC time | 2005-03-20 01:53:41 |
|---|---|
| ISC event | 7483150 |
| USGS-ANSS | ComCat |
| Local date | March 20, 2005 |
| Local time | 10:53 |
| Magnitude | 6.6 Mw |
| Depth | 9 km (5.6 mi) |
| Epicenter | 33°44′18″N 130°10′30″E / 33.73833°N 130.17500°E |
| Areas affected | Japan, Fukuoka |
| Max. intensity | MMI VII (Very strong) JMA 6− |
| Peak acceleration | 0.49 g 483.1 Gal |
| Casualties | 1 dead, 1204 injured |
The Fukuoka earthquake (福岡県西方沖地震, Fukuoka-ken Seihō Oki Jishin), also known as the Fukuoka Prefecture West Sea Earthquake, struck Fukuoka Prefecture, Japan at 10:53 am JST on March 20, 2005, off the northwest coast of Fukuoka Prefecture, and lasted for approximately 1 minute.[1] The Japan Meteorological Agency (JMA) measured it as peaking at a magnitude of 7.0 and a maximum seismic intensity of less than six, whereas the United States Geological Survey (USGS) reported a magnitude of 6.6.[2] The quake occurred along a previously unknown fault in the Genkai Sea, North of Fukuoka city, and the residents of Genkai Island were forced to evacuate as houses collapsed and multiple landslides occurred in various places.[3] Investigations subsequent to the earthquake determined that the new fault was most likely an extension of the known Kego fault that runs through the centre of the city.[4]
The earthquake caused significant damage in coastal areas such as Genkai Island in Nishi Ward, Fukuoka City, where half of the homes were completely destroyed, as well as in areas including Noko island, Nishiura, Miyanoura, and Shika island.[5] The impact also extended to Fukuoka City and surrounding municipalities such as Shima Town and Maehara City (now Itoshima City). There was one fatality, approximately 1,200 injuries, and around 140 homes completely destroyed.[6] It was the largest earthquake in recorded history near Fukuoka City.[7]
Fukuoka is not as seismically active as many other parts of Japan, and was known prior to the earthquake as one of Japan's safest locations in terms of natural disasters; the previous earthquake, a magnitude 5, had occurred over a hundred years ago and it had been centuries since the city had experienced a serious earthquake.
- ^ "Seismic Activity Off-shore of Kushiro". Headquarters for Earthquake Research Promotion. Retrieved 2024-04-07.
- ^ United States Geological Survey. Magnitude 6.6 – Kyushu, Japan Archived 2009-12-18 at the Wayback Machine Verified 2011-03-20.
- ^ Tanaka, Reiji; Kitada, Naoko; inoue, Naoto. "Geological structure of the Kego fault zone from using the boring database". Japanese Geotechnical Society Special Publication.
- ^ El-Aziz Khairy, Abd; El-Aal, Abd (July 2011). "JAPAN EARTHQUAKE OF MARCH 11-2011 AND ASSOCIATED EFFECTS". Ministry of Scientific Research National Research Institute of Astronomy and Geophysics (Nriag)- Seismology Departement- Egyptian National Seismological Network Helwan, Cairo, Egypt – via Egyptian National Seismological Network Seismology Department National Research Institute of Astronomy and Geophysics.
- ^ "福岡市 福岡県西方沖地震記録誌". city.fukuoka.lg.jp. Retrieved 2024-04-07.
- ^ "福岡市 玄界島震災復興記録誌". city.fukuoka.lg.jp. Retrieved 2024-04-07.
- ^ "２００５年３月２０日福岡県西方沖の地震の評価". Headquarters for Earthquake Research Promotion. Retrieved 2024-04-07.