The 1968 Hyūga-nada earthquake (
Japanese: 1968年日向灘地震) occurred on April 1 at . The earthquake had a magnitude of 7.5, and the epicenter was located in
Hyūga-nada Sea, off the islands of
Kyushu
is the third-largest island of Japan's five main islands and the most southerly of the four largest islands ( i.e. excluding Okinawa). In the past, it has been known as , and . The historical regional name referred to Kyushu and its surroun ...
and
Shikoku,
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. 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
Kochi is a city in Kerala, India.
Kochi or Kōchi may also refer to:
People
* Kochi people, a predominantly Pashtun nomadic people of Afghanistan
* , a Japanese surname:
** Arata Kochi (born 1948 or 1949), Japanese physician and World Health Org ...
.
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
The is a submarine Trough (geology), trough located south of the Nankaidō region of Japan's island of Honshu, extending approximately offshore. The underlying Fault (geology), fault, the ''Nankai megathrust,'' is the source of the devastating ...
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.
See also
*
List of earthquakes in 1968
*
List of earthquakes in Japan
References
External links
*
{{DEFAULTSORT:1968 Hyuga-nada earthquake
Hyuga-nada
Hyuga-nada
1968 tsunamis
April 1968 events in Asia
Earthquakes of the Showa period
1968 disasters in Japan