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| 日本海大地震 (Great Sea of Japan earthquake) | |
  | |
| UTC time | 2024-06-03 23:16:09 |
|---|---|
| USGS-ANSS | ComCat |
| Local date | 4 June 2024 |
| Local time | 08:16:09 JST (UTC+9) |
| Magnitude | 8.6 MJMA 8.4 Mw |
| Depth | 28.5 km (17.7 mi) |
| Epicenter | 37°29′17″N 137°16′16″E / 37.488°N 137.271°E |
| Type | Megathrust |
| Areas affected | western coast of Japan |
| Max. intensity | JMA 7 (MMI VIII) |
| Landslides | Yes |
| Foreshocks | 7.6 MJMA |
On 3 June 2024, at 08:16 JST (23:16 UTC on 2 June), a MJMA8.6 (Mw8.4) earthquake struck 16 km (9.9 mi) northeast of Suzu, located on the Noto Peninsula of Ishikawa Prefecture, Japan.[1] The megathrust shock achieved a maximum JMA seismic intensity of Shindo 7.[2] It was the largest earthquake in Japan since the 2011 Tōhoku earthquake.[3] A tsunami was measured along the Sea of Japan coast.[4]
Tectonic setting edit
The Noto Peninsula lies on the southeastern margin of the Sea of Japan, which was formed by back-arc rifting related to subduction of the Pacific Plate beneath the Eurasian Plate along the Japan Trench. This process began during the Early Miocene, ending in the Middle Miocene. By the late Pliocene the tectonic regime changed to compression, probably associated with collision between the Izu–Bonin Arc and Honshu.[5] This led to reactivation of the rift faults in reverse sense, combined with inversion of the basins formed by these faults.[6] Currently Japan is situated on the convergent boundaries between the Pacific, Philippine Sea, Okhotsk and Amurian Plates. Along the island arc's east and southeast coasts, subduction of the Pacific and Philippine Sea Plates occurs at the Japan Trench and Nankai Trough, respectively. The west coast of Honshu, bordering the Sea of Japan, is a north–south trending convergent boundary between the Amurian and Okhotsk Plates. It has been proposed that it is an incipient subduction zone, consisting of eastward-dipping thrust faults.[7]
The rifting and subsequent inversion has created a series of faults along the coast that have the potential to move and cause earthquakes, in the range of Mw 6.8–7.9, in many cases with tsunamis.[8] Major earthquakes and tsunamis along this boundary occurred in 1833, 1940, 1964, 1983 and 1993. The largest and most destructive tsunami in the Sea of Japan occurred in 1741 and was attributed to the eruption of Oshima.[9] A fault known as the F43 (in the list of 60 faults evaluated) reaches the seabed just north of the Noto peninsula trending WSW–ENE. This southeast-dipping fault, which consists of two segments with a combined length of 94.2 km (58.5 mi), has been judged to be capable of producing an earthquake of Mw 7.6.[10]
Earthquake edit
The United States Geological Survey (USGS) reported a moment magnitude of 8.4 and a focal depth of 28.5 km (17.7 mi) for the earthquake. The Japan Meteorological Agency recorded a magnitude of MJMA 8.6.[11][12] It was the largest to strike Mainland Japan since the 2011 Tōhoku earthquake, and the largest recorded earthquake in the Sea of Japan.[13]
Intensity edit
| Intensity | Prefecture | Locations |
|---|---|---|
| 7 | Ishikawa | Kanazawa, Shika, Wajima, Anamizu, Nanao, Suzu, Noto |
| Niigata | Sado, Ojiya | |
| 6+ | Ishikawa | Nakanoto, Hakui, Hōdatsushimizu, Komatsu, Kahoku, Nomi, Hakusan, Uchinada |
| Niigata | Nagaoka, Sanjō, Kashiwazaki, Mitsuke, Minamiuonuma, Tsubame, Jōetsu, Chūō-ku, Minami-ku, Nishi-ku, Nishikan-ku, Kariwa, Itoigawa, Myōkō | |
| Toyama | Toyama, Funahashi, Takaoka, Himi, Oyabe, Nanto, Imizu, | |
| Fukui | Awara | |
| 6− | Ishikawa | Kaga, Tsubata, |
| Niigata | Kamo, Tōkamachi, Izumozaki, Kita-ku, Higashi-ku, Kōnan-ku, Akiha-ku, Gosen, Agano | |
| Toyama | Namerikawa, Kurobe, Kamiichi, Tateyama, Asahi, Tonami | |
| Fukui | Fukui, Sakai | |
| Gifu | Shirakawa, Hida | |
| Nagano | Hakuba, Nagano, Iiyama, Nozawaonsen |