2023 Ishikawa earthquake
2023 Ishikawa earthquake is located in Ishikawa Prefecture
2023 Ishikawa earthquake
2023 Ishikawa earthquake is located in Japan
2023 Ishikawa earthquake
UTC time2023-05-05 05:42:04
ISC event626093124
USGS-ANSSComCat
Local dateMay 5, 2023 (2023-05-05)
Local time14:42:04 JST (UTC+9)
Magnitude6.3 Mw
6.5 MJMA
Depth8.7 km (5 mi) (USGS)
Epicenter37°32′24″N 137°18′18″E / 37.540°N 137.305°E / 37.540; 137.305
FaultA previously unknown fault[1]
TypeReverse
Areas affectedJapan
Max. intensityJMA 6+
VIII (Severe)
Tsunami10 cm (0.33 ft)[2]
LandslidesYes
Aftershocks>300 (as of 21 October 2023)
Largest is Mw5.6[3][4]
Casualties1 dead, 44 injured

On 5 May 2023, a magnitude 6.3 earthquake struck off the coast of Ishikawa Prefecture, Japan.[5][6] It was located 49 kilometres (30 miles) northeast of Anamizu, Hōsu District, with the town of Suzu closest to the epicenter.[6]

Tectonic setting

The northeastern tip of the Noto Peninsula has been subject to an earthquake swarm for over two years; the earthquake is one of the largest events in this swarm, surpassing a MJMA 5.4 event that took place in June 2022.[7]

The earthquake was located in a zone of compressional deformation that is associated with the boundary between the Amur Plate and the Okhotsk Plate. In this area, the Okhotsk Plate is converging to the west-northwest towards the Amur Plate with a velocity of about 9 mm/yr and a maximum convergence rate of 24 mm/yr.[8] The Amur and Okhotsk plates are relatively small plates that are located between the Pacific Plate and the Eurasian Plate. The Pacific Plate converges west-northwest towards the Eurasian Plate at around 90 mm/yr.

Earthquake

The earthquake had a magnitude of Mww 6.2, Mw 6.3 or MJMA 6.5 according to the United States Geological Survey, GCMT and Japan Meteorological Agency respectively.[5] It struck at 14:42 JST at a depth of 8.7 kilometers. According to the JMA a maximum intensity of Shindo 6+ was recorded, while the USGS estimated a maximum Modified Mercalli intensity of VIII (Severe).[9] The earthquake had a focal mechanism corresponding to reverse faulting.[10] A magnitude 5.6 aftershock struck the area at 21:58 JST, succeeded by another aftershock, at 23:18 JST of magnitude 4.5, along with over 50 other aftershocks hitting on Saturday, between magnitude 2 and 5.[11][4][12]

Seismic intensities above Shindo 4[13][14]
Seismic intensity Prefecture Location
6+ Ishikawa Suzu
5+ Ishikawa Noto
5- Ishikawa Wajima
4 Ishikawa Nanao, Anamizu, Kanazawa
Niigata Jōetsu, Nagaoka
Toyama Takaoka, Himi, Oyabe
Fukui Fukui

Damage

Eighteen buildings reportedly collapsed and 719 others were damaged,[15][16] with two people being trapped under rubble before being rescued.[17] One building each were also partially damaged in Wajima and Kanazawa.[18] Tiles fell from the roof of a train station in Suzu. Multiple buildings and structures were severely damaged, including a hotel, gravestones in a cemetery, a barn, a Shinto shrine, a police station in Suzu, and numerous houses. Landslides were also reported, causing the partial collapse or damage of mountainside houses. A man who fell from a ladder and suffered from cardiac arrest succumbed to his injuries later in hospital.[9][12] At least 44 others were injured (43 in Ishikawa and another in Toyama Prefecture),[15] including two people who fell unconscious, two people injured by collapsed houses, a minor who was hit by a falling wardrobe and another who suffered burns. Two of the injured were in serious condition and the rest received minor injuries.[9][17][19][20][21][22] The Mitsukejima, which was previously affected by an intensity lower 6 earthquake the previous year, partially collapsed.[9] Two elevators were automatically shut down in the Abeno Harukas skyscrapers in Osaka, leaving some stranded before being evacuated.[2] Twenty homes had their electricity cut off in Suzu,[23] with more than 120 losing water supply.[24]

Response

Due to the earthquake, around 1,600 people were evacuated. In Ishikawa Prefecture, 250 people took shelter in evacuation centers.[25] The Japan Meteorological Agency warned the citizens of Ishikawa that strong aftershocks could occur for at least a week. The mayor of Suzu, issuing an earthquake emergency advisory and evacuating multiple households, said that the city would not be needing the help of Japan Self-Defense Forces due to the quake.[26] Prime minister Fumio Kishida also stated that more measures will be taken in the following days, while also communicating with multiple officials, also to prevent other casualties in the event of a strong aftershock.[27]

See also

References

  1. ↑ "能登震度6強を起こしたのは「伏在断層」か未知の断層 地震活動の海側・浅い方向への拡大に地震調査委「津波伴う地震に注意を」". JNN. Retrieved 14 May 2023.
  2. 1 2 "M6.5 quake rocks central Japan amid Golden Week holidays, 1 dies". Kyodo News. 5 May 2023. Retrieved 5 May 2023.
  3. ↑ "石川県能登地方の地震活動の最大震度別地震回数表" (PDF). Japan Meteorological Agency. Retrieved 6 May 2023.
  4. 1 2 National Earthquake Information Center (5 May 2023). "M 5.6 - near the west coast of Honshu, Japan". United States Geological Survey. Retrieved 5 May 2023.
  5. 1 2 "Global CMT Catalog Search". Global Centroid Moment Tensor. 5 May 2023. Retrieved 6 May 2023.
  6. 1 2 National Earthquake Information Center (5 May 2023). "M 6.2 - near the west coast of Honshu, Japan". United States Geological Survey. Retrieved 5 May 2023.
  7. ↑ "令和５年５月５日14時42分頃の石川県能登地方の地震について" (PDF). Japan Meteorological Agency. Retrieved 6 May 2023.
  8. ↑ Alex K. Tang, P.E. and Anshel J. Schiff, ed. (2007). "2". Kashiwazaki, Japan Earthquake of July 16, 2007. ASCE, Technical Council on Lifeline Earthquake Engineering. p. 7. ISBN 9780784410622. Archived from the original on March 3, 2014. Retrieved May 5, 2023.
  9. 1 2 3 4 "【随時更新】被害の状況は 石川県能登地方で震度6強の地震" (in Japanese). NHK. 5 May 2023. Retrieved 5 May 2023.
  10. ↑ "Near West Coast of Honshu, Japan 2023/05/05 05:42:04 UTC, Mw=6.2". Geoscope Observatory. 5 May 2023. Retrieved 5 May 2023.
  11. ↑ "地震情報 : 詳細情報". Japanese Metereological Agency. 5 May 2023.
  12. 1 2 "More than 50 aftershocks shake Japan as earthquake kills one". Al Jazeera.
  13. ↑ "震源・震度情報". 気象庁. Retrieved 2023-05-05.
  14. ↑ "Earthquake information : Detail information". www.data.jma.go.jp. Retrieved 5 May 2023.
  15. 1 2 "住宅の全壊が2棟増えて18棟に…震度6強を観測した石川・能登地方の地震 最新の被害状況まとめ（石川テレビ）". news.yahoo.co.jp (in Japanese). 18 May 2023. Archived from the original on 19 May 2023. Retrieved 19 May 2023.
  16. ↑ "「危険」判定の住宅300棟に迫る…震度6強を観測した石川・珠洲市の地震 最新の被害状況まとめ". Fuji News Network (in Japanese). 10 May 2023. Archived from the original on 11 May 2023. Retrieved 10 May 2023.
  17. 1 2 "珠洲で建物３棟倒壊し２人下敷き、２人とも救出され病院搬送…同市内で１人死亡". yomiuri.co.jp (in Japanese). 5 May 2023. Retrieved 5 May 2023.
  18. ↑ "249棟の住宅が「危険」と判定…震度6強を観測した石川・珠洲市の地震 最新の被害状況まとめ". Yahoo! Japan (in Japanese). 10 May 2023. Retrieved 10 May 2023.
  19. ↑ "石川震度6強 1人死亡・13人搬送". Yahoo! Japan (in Japanese). 5 May 2023. Archived from the original on 5 May 2023. Retrieved 5 May 2023.
  20. ↑ "石川で震度6強 物販店のエスカレーターが停止 60代女性が転倒し足を負傷 富山・高岡市". Japan News Network (in Japanese). 5 May 2023. Retrieved 5 May 2023.
  21. ↑ Yamaguchi, Mari (5 May 2023). "Strong quake in central Japan; 1 dead, more than 20 injured". Associated Press. Retrieved 6 May 2023.
  22. ↑ "地震の建物被害、石川で５９３棟 けがは３７人に、震度６強". shinmai.co.jp (in Japanese). 10 May 2023. Retrieved 10 May 2023.
  23. ↑ Kyodo News (5 May 2023). "石川・珠洲で２０戸停電" (in Japanese). Reuters. Retrieved 6 May 2023.
  24. ↑ "Quake-hit central Japan's Ishikawa Pref. braces for more aftershocks, rain". The Mainichi Shimbun. 6 May 2023. Archived from the original on 10 May 2023. Retrieved 6 May 2023.
  25. ↑ Daily Sabah (5 May 2023). "Aftershocks shake Japan day after strong earthquake killed 1". Daily Sabah. Retrieved 6 May 2023.
  26. ↑ Kyodo News (5 May 2023). "Quake-hit central Japan braces for more aftershocks, heavy rain". Retrieved 6 May 2023.
  27. ↑ NWorld (7 May 2023). "One dead after earthquake shakes central Japan". Retrieved 7 May 2023.
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