From Surf Wiki (app.surf) — the open knowledge base

1946 Nankai earthquake

Magnitude 8.1–8.4 earthquake in Nankaidō, Japan

Field	Value
title	1946 Nankai earthquake
image	1946 Nankai Earthquake (12).jpg
local-date
local-time	04:19 JST
timestamp	1946-12-20 19:19:10
map	1946 Nankai earthquake intensity.png
map2	{{Location map	Japan
lat	33.0
long	135.6
mark	Bullseye1.png
marksize	40
position	top
width	260
float	center
relief	yes}}
anss-url	iscgem898698
isc-event	898698
magnitude
depth	30 km
location
countries affected	Japan
fault	Nankai megathrust
tsunami	Yes
casualties	At least 1362 dead, 2600 injured and 100 missing

|local-date= |local-time= 04:19 JST |anss-url = iscgem898698 |isc-event = 898698 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). 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

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.

Earthquake

The 1946 Nankai 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 km thick by 50 km wide at a depth of 10 km. Scientists propose that this seamount might work as a barrier inhibiting brittle seismogenic rupture.

Casualties and damage

The earthquake caused extensive damage, destroying 36,000 homes in southern Honshū alone. The earthquake also caused a huge tsunami that took out another 2,100 homes with its 5 - waves.

References

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.
(13 March 2008). "The 1946 Nankaido earthquake". United States Geological Survey.
(2000). "Subducted Seamount Imaged in the Rupture Zone of the 1946 Nankaido Earthquake". [[American Association for the Advancement of Science]].
Kanamori, H.. (1972). "Tectonic implications of the 1944 Tonankai and the 1946 Nankaido earthquakes". [[Elsevier]].

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

1946-earthquakes 1946-in-japan 1940s-tsunamis december-1946-in-asia megathrust-earthquakes-in-japan occupied-japan tsunamis-in-japan earthquakes-of-the-shōwa-era 1946-disasters-in-japan

Want to explore this topic further?

Ask Mako anything about 1946 Nankai earthquake — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report