| 令和6年能登半島地震 | |
   | |
| UTC time | 2001-03-24 06:27:53 |
|---|---|
| ISC event | 1800460 |
| USGS-ANSS | ComCat |
| Local date | 24 March 2001 |
| Local time | 15:27:53JST (UTC+9) |
| Magnitude | MJMA 6.7 Mw 6.8 |
| Depth | 50 km (31 mi) |
| Epicenter | 34°04′59″N132°31′34″E / 34.083°N 132.526°E /34.083; 132.526 |
| Type | Normal |
| Areas affected | Chūgoku andShikoku regions, Japan |
| Total damage | ¥77.6 billion (US$500 million)($886.1 million in 2024, adjusted for inflation)[1] |
| Max. intensity | JMA 6− (MMI IX) |
| Peak acceleration | 0.85g (832gal) |
| Casualties | 2 fatalities, 288 injuries |
The2001 Geiyo earthquake (2001年芸予地震Nisen-ichi-nen Gēyo Jishin) occurred with a magnitude of MJMA 6.7 on March 24 at15:27:53JST, and an epicenter located near theGeiyo Islands ofHiroshima,Japan.[2]
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Near theGeiyo region, a Ms 7.8 earthquake occurred in June 1905,[3] which was an intraslab event within the subductingPhilippine Sea plate.[4]
TheUnited States Geological Survey (USGS) gave the earthquake a magnitude of Mw 6.8, while theJapan Meteorological Agency (JMA) reported the magnitude at MJMA 6.7, with its epicenter located near the island ofKurahashi-jima inKure, Hiroshima Prefecture.[2][5] The releasedseismic moment of the earthquake was 1.3×1019 Nm. This earthquake is anormal faulting intraslab event within thesubductingPhilippine Sea plate.[6] The slip of the earthquake was estimated to be about 1.5–2.4 meters (4 ft 11 in – 7 ft 10 in). The locations of aftershocks were distributed roughly in N–S direction.[7] It has been suggested that this earthquake was related to the dehydration of the Philippine Sea plate slab.[8]
| Intensity | Prefecture | Locations |
|---|---|---|
| 6− | Hiroshima | Higashihiroshima,Ōsakikamijima,Kumano |
| 5+ | Hiroshima | Kure,Etajima,Hiroshima,Hatsukaichi,Mihara,Onomichi,Kitahiroshima |
| Ehime | Kamijima,Imabari,Saijō,Kumakōgen,Matsuyama,Masaki,Seiyo,Uwajima,Tobe | |
| Yamaguchi | Suō-Ōshima,Yanai,Tabuse,Hirao,Waki,Iwakuni,Yamaguchi | |
| 5− | Hiroshima | Fukuyama,Sera,Miyoshi |
| Ehime | Ikata,Yawatahama,Ōzu,Uchiko,Iyo,Tōon,Niihama | |
| Yamaguchi | Kaminoseki,Hikari,Kudamatsu,Shūnan | |
| Shimane | Gōtsu,Hamada,Ōnan | |
| Kōchi | Kōchi | |
| Ōita | Saiki |
The JMA reported it recorded a maximum seismic intensity ofShindo 6- on itsseismic intensity scale; the maximum intensity was reported inHigashihiroshima,Ōsakikamijima andKumano,Hiroshima Prefecture.Shindo 5+ was recorded in parts ofEhime andYamaguchi Prefectures, whileShindo 5- was observed in multiple areas ofShimane,Kōchi andŌita Prefectures;Shindo 1-4 was also reported inKyushu,Kansai andChūbu regions, with shaking recorded as far away asShizuoka,Noto, Ishikawa,Iizuna andKōzushima, Tokyo.[5] A maximumpeak ground acceleration of 832gal (0.85g) was recorded atSaeki-ku, Hiroshima; strong ground motions from the earthquake were amplified and spread to areas far from the epicenter, due to the ground beneath the region comprising soft sediments.[9] On theModified Mercalli intensity scale, the earthquake registered a maximum intensity of IX (Violent).[1] Tremors were also felt along the eastern and southern coasts ofSouth Korea.[10]
Two people were killed; one inKure, Hiroshima due to a wall collapse and the other inMatsuyama, Ehime after being hit by falling roof tiles.[11][10] Additionally, 288 others were injured, 43 of them seriously, including 183 in Hiroshima, 75 in Ehime, 12 in Yamaguchi, 4 in Kochi, 3 in Shimane and 1 inOkayama. The earthquake destroyed 76 homes, severely damaged 865 and partially damaged 53,243 others, with all structural collapses occurring in Hiroshima, Ehime and Yamaguchi; landslides destroyed 39 homes, mostly in Hiroshima. Additionally, 40,739 waterways, 1,209 cultural and educational facilities, 787 roads, 149 harbors, 97 hospitals, 9 bridges, 8 public buildings and 71 other structures were also affected.[12]
InHiroshima, over 3,700 buildings were damaged,[2] train lines were suspended,Hiroshima Airport was temporarily closed for inspection, telecommunications were disrupted andsoil liquefaction was reported.[10][13] Most of the damaged residential buildings in the city were built on steep slopes.[14] Liquefaction also occurred atTōyo, Ehime.[15] Power outages occurred in the prefectures of Hiroshima, Ehime,Okayama,Yamaguchi, andKōchi.[16]