Historical seismicity in Hispaniola. Location of historical earthquake
is poorly constrained.
Seismotectonic context of the Caribbean plate.
Seismicity from the USGS/NEIC database (1974-Present).
Focal mechanism and surface projection of estimated rupture
planes/geometry for large (M>7.0) historic and a recent M6.5 earthquake in the region
since 1751. NHDF: North Hispaniola Deformation Front; NHF: North Hispaniola Fault;
WP: Windward Passage; EFZ: Enriquillo Fault Zone; SFZ: Septentrional Fault Zone;
MP: Mona Passage; PR: Puerto Rico. From Ali et al., GJI, 2008.
GPS velocities used in Manaker et al. (2008), shown by black arrows.
Ellipses are 95 per cent con#dence. The heavy black ar row (CA) shows
the velocity of the Caribbean plate relative to the North American
Plate, from DeMets et al. (2000). White arrows show the earthquake
slip vectors used in the study. BoF, Bowin Fault; BuF, Bunce fault.
Changes in Coulomb failure stressed caused by the M7.0 earthquake
on January 12, 2010. Red are areas have been brought closer
to rupture. Note that the aftershocks concentrate at the western
end of the rupture, in an area where the model predicts an increase
in Coulomb failure stress. Calculation is done for a friction of
0.2 on receiver faults with strike = 90 degrees, dip = 90 degrees,
rake = 0 (i.e., pure left-lateral strike-slip).
Simulation of coseismic ground motion based on the finite fault model
of USGS/NEIC (left) and Caltech (right). Black arrows show expected
displacements at GPS sites, background color shows interferometric
fringes (ALOS PALSAR ascending, 11.8 cm range change between fringes).