1918 Celebes Sea earthquake

The 1918 Celebes Sea earthquake occurred on August 15 at 12:18 UTC near the Moro Gulf coast of Mindanao.[2] It had a magnitude of 8.3 on the moment magnitude scale[3] and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. The earthquake has been associated with the Cotabato Trench, the surface expression of an active east-dipping subduction zone beneath Mindanao.[4]

1918 Celebes Sea earthquake
UTC time1918-08-15 12:18:21
ISC event913230
USGS-ANSSComCat
Local dateAugust 15, 1918 (1918-08-15)
Local time20:18
Magnitude8.3 Mw[1]
Depth20 km (12 mi)[1]
Epicenter5.967°N 124.377°E / 5.967; 124.377[1]
Max. intensityMMI X (Extreme)
TsunamiYes
Casualties52
1976
1918
2002
Near the Cotabato Trench, two of the largest 20th century Philippine earthquakes: the 1918 Celebes Sea earthquake (8.3 Mw) and the 1976 Moro Gulf earthquake (8.0 Mw). Also included is the recent 2002 Mindanao earthquake (7.5 Mw). The Moro Gulf, part of the Celebes Sea, is labeled for context.

Earthquake

The earthquake had a magnitude of 8.3 on the Moment magnitude scale, it had an estimated depth of 20 kilometers. The earthquake was 75 kilometers South southwest of Palimbang, Sultan Kudarat.[5] A station at Butuan registered over 600 aftershocks.[6]

Tsunami

This event in the southern Philippines triggered a large tsunami, with a maximum run-up of 7.2 m,[7] which affected the coasts of the Celebes Sea, causing widespread damage. The combined effects of the earthquake and the tsunami caused 52 casualties. With some sources stating that the tsunami alone caused up to 1,000 casualties.[8]

Losses

The estimated losses were up to 5-25 million dollars. There was damage to a stone bridge at Paleleh, Central Sulawesi.[6]

See also

References
  1. "M 8.3 - Mindanao, Philippines". United States Geological Survey. August 15, 1918. Retrieved August 27, 2017.
  2. "Comments for the Significant Earthquake". Significant Earthquake Database. National Geophysical Data Center. Retrieved June 27, 2015.
  3. ISC (June 27, 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  4. Stewart, G.S.; Cohn, S.N. (1979). "The 1976 August 16, Mindanao , Philippine earthquake (Ms = 7.8) - evidence for a subduction zone south of Mindanao". Geophysical Journal of the Royal Astronomical Society. 57 (1): 51–65. Bibcode:1979GeoJ...57...51S. CiteSeerX 10.1.1.926.8672. doi:10.1111/j.1365-246X.1979.tb03771.x.
  5. earthquake.usgs.gov https://earthquake.usgs.gov/earthquakes/eventpage/iscgem913230/executive#executive. Retrieved June 19, 2024. {{cite web}}: Missing or empty |title= (help)
  6. "Major mag. 8.3 Earthquake - Celebes Sea, 143 km southwest of Koronadal, Philippines, on Thursday, Aug 15, 1918, at 12:18 pm (Universal Time time)". volcanodiscovery.com. Retrieved June 19, 2024.
  7. "Comments for the Tsunami Event". NGDC/WDS Tsunami Event Database. National Geophysical Data Center. Retrieved June 27, 2015.
  8. Andrew (December 11, 2022). "The Philippines vs The Pacific Ring of Fire". Naked Expat. Retrieved June 19, 2024.
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