1968 Hyūga-nada earthquake

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1968 Hyūga-nada earthquake
1968 Hyūga-nada earthquake is located in Kyushu
1968 Hyūga-nada earthquake
UTC time1968-04-01 00:42:07
ISC event823387
USGS-ANSSComCat
Local dateApril 1, 1968 (1968-04-01)
Local time09:42:07
MagnitudeMw 7.5 [1]
Depth30 km [1]
Epicenter32°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 affectedJapan
TsunamiYes
CasualtiesAbove 200 dead

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.

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.[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]

See also[]

References[]

  1. ^ a b c ISC (19 January 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  2. ^ Yagi, Yuji; Kikuchi, Masayuki (2003), "Partitioning between seismogenic and aseismic slip as highlighted from slow slip events in Hyuga-nada, Japan" (PDF), Geophysical Research Letters, 30 (2): 1087, Bibcode:2003GeoRL..30.1087Y, doi:10.1029/2002GL015664, archived from the original (PDF) on 2011-07-21, retrieved 2011-04-02
  3. ^ Geist, Eric L (2002), "Complex earthquake rupture and local tsunamis" (PDF), Journal of Geophysical Research, 107 (B5): 2086, Bibcode:2002JGRB..107.2086G, doi:10.1029/2000JB000139
  4. ^ "高知県の地震活動の特徴". www.jishin.go.jp. 地震調査研究推進本部.{{cite web}}: CS1 maint: url-status (link)
  5. ^ Asano, Y.; Obara, K.; Matsuzawa, T.; Hirose, H.; Ito, Y. (2015). "Possible shallow slow slip events in Hyuga‐nada, Nankai subduction zone, inferred from migration of very low frequency earthquakes". Geophysical Research Letters. 42 (2). doi:10.1002/2014GL062165.
  6. ^ Yagi, Yuji; Kikuchi, Masayuki; Yoshida, Shingo; Yamanaka, Yoshiko (1998). "Source Process of the Hyuga-nada Earthquake of April 1, 1968 (MJMA 7.5), and its Relationship to the Subsequent Seismicity". Zisin. 51 (1): 139–148. doi:10.4294/zisin1948.51.1_139. INIST:1588209.
  7. ^ "日向灘". www.jishin.go.jp.
  8. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2011-07-20. Retrieved 2011-04-02.{{cite web}}: CS1 maint: archived copy as title (link)

External links[]

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