1946 Dominican Republic earthquake

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1946 Dominican Republic earthquake
1946 Dominican Republic earthquake is located in the Dominican Republic
1946 Dominican Republic earthquake
Date August 4, 1946 (1946-08-04)
Magnitude 8.1 Ms[1]
Epicenter 19°12′00″N 69°18′58″W / 19.2°N 69.316°W / 19.2; -69.316Coordinates: 19°12′00″N 69°18′58″W / 19.2°N 69.316°W / 19.2; -69.316
Areas affected Dominican Republic
Haiti
Max. intensity IX [2]
Peak acceleration .4g (est) [3]
Tsunami Yes
Casualties ~ 100 [4]

The 1946 Dominican Republic earthquake occurred on August 4, 1946 at 17:51 UTC near Samaná, Dominican Republic. The mainshock measured 8.1 on the surface wave magnitude scale and an aftershock occurred four days later on August 8 at 13.28 UTC with a magnitude of 7.6. A tsunami was generated by the initial earthquake and caused widespread devastation across Hispaniola. The tsunami was observed in much of the Caribbean and the southern Atlantic ocean.

Damage[edit]

The earthquake killed around 100, but left some 20,000 people homeless. The death toll was unusually low as it coincided with a holiday in the afternoon, when most people were outdoors. It caused severe damage in the northern Dominican Republic from Samana to Santiago and Puerto Plata. Slumping and sand blows were observed in the Yaque del Norte and Yuna River Valleys. The earthquake was felt strongly in parts of Haiti and Puerto Rico, and to a lesser extent in the Virgin Islands and eastern Cuba.[4]

Tsunami[edit]

The Septentrional-Oriente fault zone in the Caribbean and across Hispaniola

The earthquake also caused a tsunami which struck at Matanza, near Nagua (Julia Molina) where a 2.5-metre (8 ft 2 in) - 4–5-metre (13–16 ft) high wave drowned a number of people and affected an area of land several kilometres inland. Tsunami associated with the quake killed 1600–1800 people, for a total of about 2550 fatalities.[5][6]

A small tsunami was also recorded by tide gauges at San Juan, Puerto Rico, Bermuda and in the United States at Daytona Beach, Florida and Atlantic City, New Jersey.[7]

References[edit]

  1. ^ Dolan, James F. (1998). Paul Mann, ed. Active Strike-Slip and Collisional Tectonics of the Northern Caribbean Plate Boundary Zone. Geological Society of America. p. 44. ISBN 978-0813723266. 
  2. ^ Lynch & Bodle 1948, p. 4
  3. ^ Lynch & Bodle 1948, p. 5
  4. ^ a b Historic Earthquakes: Samana, Dominican Republic 1946, USGS, Retrieved June 10, 2008
  5. ^ Woods Hole Oceanographic Institution (February 8, 2005). "Major Caribbean Earthquakes And Tsunamis A Real Risk". Science Daily. Retrieved December 9, 2012. 
  6. ^ O'Loughlin, Karen Fay; Lander, James F. (2003), Caribbean tsunamis: a 500-year history from 1498-1998, Boston: Kluwer, p. 82, ISBN 1-4020-1717-0 
  7. ^ Lander, James F.; Lockridge, Patricia A. (1989). United States Tsunamis, (including United States possessions) 1690-1988: Publication 41-2. United States Department of Commerce. pp. 219, 220. 
Sources