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1968 Hyūga-nada earthquake

Earthquake in Hyūga-nada

Field	Value
title	1968 Hyūga-nada earthquake
timestamp	1968-04-01 00:42:07
isc-event	823387
anss-url	iscgem823387
local-date
local-time	09:42:07
map2	{{Location map	Japan Kyushu#Japan
lat	32.45
long	132.27
mark	Bullseye1.png
marksize	50
position	top
width	260
float	center
relief	yes
magnitude	7.5
depth	30 km
location
countries affected	Japan
tsunami	Yes
intensity	–

casualties	1 dead, 22 injured

| isc-event = 823387 | anss-url = iscgem823387 | local-date = | local-time = 09:42:07

The 1968 Hyūga-nada earthquake (Japanese: 1968年日向灘地震) occurred on April 1 at 09:42 local time. The earthquake had a magnitude of 7.5, and the epicenter was located in Hyūga-nada Sea, off the islands of Kyushu and Shikoku, Japan. The magnitude of this earthquake was also given as 7.5. A tsunami was observed. One person was killed, and 22 people were reported injured. The intensity reached shindo 5 in Miyazaki and Kōchi.

Description

This was an interplate earthquake between the Eurasian plate and the Philippine Sea plate. In this region, the Philippine Sea plate is subducting beneath the Eurasian plate. The subduction interface around this region passes southwestwards from the Nankai megathrust to the Ryukyu Trench just south of Kyusyu.

This earthquake is the strongest event recorded in the Hyūga-nada Sea region. The maximum slip was estimated to be 4 m. It was estimated that, in the Hyūga-nada Sea region, earthquakes with magnitudes about 7.6 occur with a period of about 200 years, while earthquakes with magnitudes about 7.1 occur with a period of about 20 to 27 years. It has been pointed out that there is a tendency of occurrence of inland earthquakes in Kyushu before and after large interplate earthquakes in the Hyūga-nada Sea region.

References

(2003). "Partitioning between seismogenic and aseismic slip as highlighted from slow slip events in Hyuga-nada, Japan". Geophysical Research Letters.
(2002). "Complex earthquake rupture and local tsunamis". Journal of Geophysical Research.
National Geophysical Data Center / World Data Service (NGDC/WDS). (1972). "Significant Earthquake Database". [[National Geophysical Data Center]], [[National Oceanic and Atmospheric Administration.
"高知県の地震活動の特徴". Headquarters for Earthquake Research Promotion.
(2015). "Possible shallow slow slip events in Hyuga-nada, Nankai subduction zone, inferred from migration of very low frequency earthquakes". Geophysical Research Letters.
(1998). "Source Process of the Hyuga-nada Earthquake of April 1, 1968 (MJMA 7.5), and its Relationship to the Subsequent Seismicity". Zisin.
"日向灘". Headquarters for Earthquake Research Promotion.
"Archived copy".
ISC. (19 January 2015). "ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009)". [[International Seismological Centre]].

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.

1968-earthquakes 1968-in-japan 1960s-tsunamis april-1968-in-asia earthquakes-of-the-shōwa-era 1968-disasters-in-japan

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