1946 Nankai earthquake

1946 Nankai earthquake
1946 Nankai earthquake is located in Japan
1946 Nankai earthquake
UTC time1946-12-20 19:19:10
ISC event898698
USGS-ANSSComCat
Local dateDecember 21, 1946 (1946-12-21)
Local time04:19 JST
Magnitude
  • Mw 8.1[1]
  • Ms 8.3 (ISC)
Depth30 km (19 mi)[2]
Epicenter33°00′N 135°36′E / 33.00°N 135.60°E / 33.00; 135.60 [3]
FaultNankai megathrust
Areas affectedJapan
TsunamiYes
CasualtiesAt least 1362 dead, 2600 injured and 100 missing[1]

The 1946 Nankai earthquake (昭和南海地震 Shōwa Nankai jishin) was a great earthquake in Nankaidō, Japan. It occurred on December 21, 1946, at 04:19 JST (December 20, 19:19 UTC).[1] The earthquake measured between 8.1 and 8.4 on the moment magnitude scale, and was felt from Northern Honshū to Kyūshū. It occurred almost two years after the 1944 Tōnankai earthquake, which ruptured the adjacent part of the Nankai megathrust.

Geology

See also: Nankai megathrust earthquakes

The Nankai Trough is a convergent boundary where the Philippine Sea plate is being subducted beneath the Eurasian plate. Large earthquakes have been recorded along this zone since the 7th century, with a recurrence time of 100 to 200 years.[4]

Earthquake

The 1946 Nankaido earthquake was unusual in its seismological perspective, with a rupture zone estimated from long-period geodetic data that was more than twice as large as that derived from shorter period seismic data. In the center of this earthquake rupture zone, scientists used densely deployed ocean bottom seismographs to detect a subducted seamount 13 kilometres (8 mi) thick by 50 kilometres (31 mi) wide at a depth of 10 kilometres (6 mi). Scientists propose that this seamount might work as a barrier inhibiting brittle seismogenic rupture.[4]

Casualties and damage

The earthquake caused extensive damage, destroying 36,000 homes in southern Honshū alone.[1] The earthquake also caused a huge tsunami that took out another 2,100 homes with its 5–6-metre (16–20-foot) waves.[1]

See also

References

  1. ^ a b c d e "The 1946 Nankaido earthquake". United States Geological Survey. 13 March 2008. Archived from the original on 1 June 2008. Retrieved 2008-06-29.
  2. ^ Kanamori, H. (1972). "Tectonic implications of the 1944 Tonankai and the 1946 Nankaido earthquakes" (PDF). Physics of the Earth and Planetary Interiors. 5. Elsevier: 130. Bibcode:1972PEPI....5..129K. doi:10.1016/0031-9201(72)90082-9. Archived from the original (PDF) on 2013-11-03. Retrieved 2013-11-02.
  3. ^ National Geophysical Data Center / World Data Service (NGDC/WDS): NCEI/WDS Global Significant Earthquake Database. NOAA National Centers for Environmental Information. (1972). "Significant Earthquake Information". NOAA National Centers for Environmental Information. doi:10.7289/V5TD9V7K. Retrieved 2024-03-21.
  4. ^ a b Kodaira, S.; Takahashi, N.; Nakanishi, A.; Miura, S.; Kaneda, Y. (2000). "Subducted Seamount Imaged in the Rupture Zone of the 1946 Nankaido Earthquake". Science. 289 (5476). American Association for the Advancement of Science: 104–106. Bibcode:2000Sci...289..104K. doi:10.1126/science.289.5476.104. PMID 10884221.

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