Earthquake Hazard in the Caribbean
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Earthquake Hazard in the Caribbean
Eric CalaisUNDP and Purdue University
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Whose Fault?
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• Hispaniola is “squeezed” at a constant, inexorable, speed of 2 cm per year• This motion puts the whole islandunder pressure – earthquakes release it• As long as plates will move, there will be earthquakesLesson #1: since plate motion is inexorable, seismic hazard is inexorable
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Population at Risk for Natural Hazards
11.3 M
2.7 M
0.3 M
16.5 M
3.9 M
2.0 M
1.1 M
25 M42 M3.0 M
4.0 M
5.4 M
6.8 M
6.6 M
Total = 130 MSource: CIA Factbook
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Seismic Research UnitThe University of the West IndiesSt. AugustineTrinidad
Tel 868 662 4659 Fax 868 663 9293 e-mail [email protected]
-8 5 W -8 0 W -7 5 W -7 0 W -6 5 W -6 0 W
-8 5 W -8 0 W -7 5 W -7 0 W -6 5 W -6 0 W
Longitude
1 0 N
1 5 N
2 0 N
2 5 NLatitude
10 N
15 N
20 N
25 N
Caribbean earthquakes The instrumental Period
This slide shows earthquakes since 1964. Note that although there is far greater detail, the general pattern is the same
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Frankel, A.et al.,Documentation for Initial Seismic Hazard Maps for Haiti, USGS Open-File Report 2010.
Includes GPS and some fault information.
Range of above map
2010
OAS Caribbean Disaster Management Project, mapsimilar to GlobalSeismic Hazard Assessment Program(GSHAP) 1999.
Based on recent seismicity
= 33 % g
= 3 % g
2001
PAP = 0.13 g
PAP = 0.40 g
http://www.oas.org/CDMP/document/seismap/
Grou
nd sh
akin
g
SDQ = 0.5 g
SDQ = 0.3 g
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Jamaica Spectral Hazard Maps
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Compilation R. Bilham (U. Colorado), figure A. Freed (Purdue)