1968 Hyūga-nada earthquake

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1968 Hyūga-nada earthquake
1968 Hyūga-nada earthquake is located in Japan
1968 Hyūga-nada earthquake
UTC time
ISC event
Date April 1, 1968 (1968-04)
Origin time 00:42:07 [1]
Local date
Local time
Magnitude Mw 7.5 [1]
Depth 30 km [1]
Epicenter 32°27′N 132°16′E / 32.45°N 132.27°E / 32.45; 132.27Coordinates: 32°27′N 132°16′E / 32.45°N 132.27°E / 32.45; 132.27 [1]
Areas affected Japan
Tsunami Yes

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 Mw 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 MJMA 7.5.[2] A tsunami was observed.[3] There were 15 people reported injured,[4] the intensity reached shindo 5 in Miyazaki and Kōchi.


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 include the Nankai Trough and the Ryukyu Trench.[5]

This earthquake is the strongest event recorded in the Hyūga-nada Sea region, the maximum slip was estimated to be 4 m.[6] 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.[7] 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.[8]

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