2023 Ishikawa earthquake

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2023 Ishikawa earthquake
File:USGS Intensity Map May 5 2023 Ishikawa Earthquake M 6.2.pdf
Magnitude 6.3 ṃ
6.5 ṃ
Depth 8.7 km (5 mi) (USGS)
Epicenter Lua error in package.lua at line 80: module 'strict' not found.
Fault A previously unknown fault[1]
Type Reverse
Areas affected Japan
Max. intensity Template:JMA
VIII (Severe)
Tsunami 10 cm (0.33 ft)[2]
Landslides Yes
Aftershocks >300 (as of 21 October 2023)
Largest is ṃ5.6[3][4]
Casualties 1 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

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Main article: Eastern margin of the Sea of Japan

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 ṃ5.4 event that took place on 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 ṃ6.2, ṃ6.3 or ṃ6.5 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

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  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 9.2 9.3 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  15. ↑ 15.0 15.1 Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  17. ↑ 17.0 17.1 Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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  21. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  22. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  23. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  24. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  25. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  26. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  27. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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