earthquake hazard in the caribbean eric calais undp and purdue university
TRANSCRIPT
Earthquake Hazard in the Caribbean
Eric CalaisUNDP and Purdue University
Whose Fault?
• 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
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
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
1 0 N
1 5 N
2 0 N
2 5 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
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/
Gro
und
shak
ing
SDQ = 0.5 g
SDQ = 0.3 g
Jamaica Spectral Hazard Maps
Compilation R. Bilham (U. Colorado), figure A. Freed (Purdue)