1792 Unzen landslide and tsunami

1792 Unzen landslide and tsunami
1792 Unzen landslide and tsunami is located in Kyushu
1792 Unzen landslide and tsunami
1792 Unzen landslide and tsunami is located in Japan
1792 Unzen landslide and tsunami
Local dateMay 21, 1792 (1792-05-21)
Magnitude6.4 Ms[1]
Epicenter32°48′N 130°18′E / 32.8°N 130.3°E / 32.8; 130.3
Areas affectedJapan: Kyushu, Shimabara, Nagasaki
TsunamiYes
Casualties15,000 deaths from landslide and megatsunami (estimate)

The 1792 Unzen landslide and tsunami resulted from the volcanic activities of Mount Unzen (in the Shimabara Peninsula of Nagasaki Prefecture, Japan) on 21 May. This caused the collapse of the southern flank of the Mayuyama dome in front of Mount Unzen, resulting in a tremendous tsunami, killing 15,000 people altogether.[2] It was also called Shimabara erupted, Higo affected (島原大変肥後迷惑), (Shimabara means the central mountain of the Shimabara Peninsula) since many people were killed by this tsunami in Higo (Kumamoto Prefecture, situated 20 km (12.4 mi) across the Ariake Sea).

Change of coastline of Ariake Sea, Mount Unzen in the center, Kumamoto Prefecture (right) and Amakusa islands (down) were affected by tsunami

Volcanic activities

Towards the end of 1791, a series of earthquakes occurred on the western flank of Mount Unzen which gradually moved towards Fugen-dake (one of Mount Unzen's peaks). In February 1792, Fugen-dake started to erupt, triggering a lava flow which continued for two months. Meanwhile, the earthquakes continued, shifting nearer to the city of Shimabara. On the night of 21 May, two large earthquakes were followed by a collapse of the eastern flank of Mount Unzen's Mayuyama dome, causing a landslide which swept through the city of Shimabara and into the Ariake Sea, triggering a great tsunami.

  • Mount Unzen (center) and Mayuyama (right) showing the destruction, recent photo
    Mount Unzen (center) and Mayuyama (right) showing the destruction, recent photo
  • Mayuyama of Shimabara Peninsula, from the sea of Shimabara City
    Mayuyama of Shimabara Peninsula, from the sea of Shimabara City

Megatsunami

It is not known whether the collapse occurred as a result of an eruption of the dome or as a result of the earthquakes. The tsunami struck Higo Province on the other side of Ariake Bay before bouncing back and hitting Shimabara again. Out of an estimated total of 15,000 fatalities, around 5,000 are thought to have been killed by the landslide, around 5,000 by the tsunami across the bay in Higo Province, and a further 5,000 by the tsunami returning to strike Shimabara. The initial wave once reached a height of 330 ft (100 m), classing this tsunami as a megatsunami. At the Osaki-bana point Futsu town, the waves locally grew to a height of 187 ft (57 m) due to the effect of sea bottom topography.

Monuments

As of July 1991, the following monuments have been found:[3]

Monuments related to the earthquake and tsunami
Kind of Monument Kumamoto Prefecture Nagasaki Prefecture Total
Memorial monument 43 41 84
Tsunami border monument 5 0 5
Graves 16 90 106
Simple monument 1 0 1
Others 9 3 12
Total 74 134 208

Lake Shirachi

Lake Shirachi

Lake Shirachi is a pond in Shimabara city, Nagasaki Prefecture which was created after the landslide at Mayuyama created by the inpouring of underground water. Its size was first 1 km (south-north) and 300m 400m (east to west), but the production of a water exit river made it smaller and it is now 200 m by 70 m.

Tsukumojima (99 Islets)

Tsukumojima

As a result of the destruction, Tsukumojima or 99 islets or rocks were distributed near Shimabara city. In the same Nagasaki Prefecture, there are 99 islands or Kujūkushima distributed from Sasebo city to Hirado city. These islands are different from Tsukumojima.

See also

References

  1. ^ National Geophysical Data Center. "Comments for the Significant Earthquake". Retrieved 22 July 2011.
  2. ^ Johnston, Eric (1 March 2011). "Latest volcano show: Shinmoe". The Japan Times. p. 3. Retrieved 5 May 2014.
  3. ^ 200 Years after the Kansei Great Tsunami, Symposium and Exhibition of Unzen Disaster Booklet published by Newspaper Museum, Yoyasu Machi, Kumamoto-shi, 1991

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