Dominican Rep.

M=6.5 Dominican Republic Preliminary Earthquake Report

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Magnitude: 6.5

Date-Time:

Monday, September 22, 2003 at 04:45:35 (UTC)= Coordinated Universal Time
Monday, September 22, 2003 at 0:45:35 AM = local time at epicenter

Location: 19.676°N, 70.669°W

Depth: 10 km (6 miles) set by location program

Region: DOMINICAN REPUBLIC REGION

Distances:

15 km (10 miles) S of Puerto Plata, Dominican Republic
20 km (10 miles) N of Santiago, Dominican Republic
150 km (95 miles) NNW of SANTO DOMINGO, Dominican Republic
1185 km (740 miles) ESE of Miami, Florida

Location Uncertainty: horizontal +/- 5.5 km (3.4 miles); depth fixed by location program

Parameters: Nst=142, Nph=142, Dmin=505.9 km, Rmss=0.94 sec, Gp= 50°, M-type=teleseismic moment magnitude (Mw), Version=R

Tectonic Summary:

The earthquake occurred on the diffuse boundary of the Caribbean and North American plates. The Caribbean plate moves to the east with respect to the North American plate at about 2 cm/y. The plate boundary in the Dominican Republic is oriented slightly oblique to the direction of relative plate-motion. The boundary in this region includes major strike-slip faults that accommodate plate-motion that is parallel to the boundary and also dip-slip faults that accommodate plate motion that is perpendicular to the boundary. The moment-tensor solution of the September 22 earthquake implies that it occurred as the result of dip-slip faulting.