Comment on “Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region” by U. ten Brink et al.

Prentice, Carol S.; Mann, Paul; Peña, Luis R.

doi:10.1002/jgrb.50170

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“…Both events are commonly ascribed to the offshore portion of the Septentrional fault, because paleoseismological studies show that no surface rupture has occurred on the onshore portion of the Septentrional fault in the central Dominican Republic in the last 800 years (Prentice et al ., ). Recent studies of historical earthquake accounts (ten Brink et al ., ; Bakun et al ., ) that have assigned historical earthquakes to the onshore strike‐slip faults are challenged by the available paleoseismological studies (Prentice et al ., ). The late Holocene slip rate of 6–12 mm a −1 for the Septentrional fault derived from paleoseismological restoration (Prentice et al ., ) agrees with the rate of 9.8 ± 2 mm a −1 computed from GPS along the Septentrional fault (Benford et al ., ; Fig.…”

Section: Introductionmentioning

confidence: 97%

Segmentation and kinematics of the North America‐Caribbean plate boundary offshore Hispaniola

et al. 2015

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Highlights: 27• We explored submarine portions of fault systems bounding the Gonâve microplate 28• Structures are a series of delineated left--lateral strike--slip fault segments 29• The distinct segments 50 to 100 km--long cut across pre--existing structures 30• A 16.5km total strike--slip displacement on the northern system estimated since 1.8 Ma 38Haiti and Jamaica (EPGFZ) and 300--km between Dominican Republic and Cuba (SOFZ). The primary 39 plate--boundary structures are a series of strike--slip fault segments associated with pressure ridges, 40restraining bends, step--over, and dogleg offsets indicating very active tectonics. Several distinct 41 segments 50 to 100 km--long cut across pre--existing structures inherited from former tectonic 42 regimes or bypass recent morphologies formed under the current strike--slip regime. Along the most 43 recent trace of the SOFZ, we measured a strike--slip offset of 16.5 km that indicates steady activity for 44 the past ~1.8 Ma if its current GPS--derived motion of 9.8 ±2 mm/yr has remained stable during the 45 entire Quaternary. 47 48 -Introduction 49 50Following the 2010 Mw 7.0 Haiti earthquake, an international effort was initiated to investigate the 51 corresponding fault system and to constrain both the individual fault slip rates and their seismic 52 history. Such an effort depends critically on knowledge of the detailed geometry of the fault system 53 delineating the northern boundary of the Caribbean domain (Fig. 1). The Caribbean plate is currently 54 moving eastward relative to North America and the plate motion is accommodated along a complex, 55200 km--wide deformed zone, the Northern Caribbean plate Boundary (NCarB). The NCarB is a 56 seismogenic zone extending over 3000 km along the northern edge of the Caribbean Sea ( Fig. 1) and 57 a deforming region that includes two large strike--slip fault systems, the Septentrional--Oriente fault 58 zone (SOFZ) in the north and the Enriquillo--Plantain--Garden fault zone (EPGFZ) in the south (Mann et 59 al., 1991; Calais and De Lépinay, 1995). The SOFZ extends from the Mid Cayman spreading center, 60 initiated 50 Ma ago (Leroy et al., 2000), runs along the Southern coast of Cuba to cut across the 61 northern Hispaniola (Calais and Mercier de Lépinay, 1989; Mann et al., 1998). The EPGFZ, the 62 prolongation to the east of Jamaica of the Walton fault, cuts across the Southern Peninsula in Haiti 63and dies out eastwards in the vicinity of the Muertos trough south of Hispaniola, delimiting the 64Gonâve microplate (DeMets and Wiggins--Grandison, 2007) (Fig. 1). Between the two strike--slip 65 systems, the middle to late Eocene East Cayman margin is described offshore Jamaica (Leroy et al., 66 1996) and the early Miocene to Present collisional wedge of Haiti, well--described onshore (Pubellier 67 et al., 2000), continues offshore in the Gonâve Gulf ( Figs. 1 and 2). 68Destructive earthquakes are reported along the NCarB both onshore and offshore (Ali et al., 2008; 69 96 -Geometry and segmentation o...

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Section: Introductionmentioning

confidence: 97%

Segmentation and kinematics of the North America‐Caribbean plate boundary offshore Hispaniola

et al. 2015

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Comment on “Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region” by U. ten Brink et al.

Abstract: Citation: Prentice, C. S., P. Mann, and L. R. Pen˜a (2013), Comment on "Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region" by U. ten Brink et al.,

Cited by 1 publication

References 13 publications

Segmentation and kinematics of the North America‐Caribbean plate boundary offshore Hispaniola

Segmentation and kinematics of the North America‐Caribbean plate boundary offshore Hispaniola

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