July 29, 1943 Puerto Rico Earthquake Archive

1943 7/29 03:02 66.97W 18.99N 29Km Mw=7.5 Off North West Coast of Puerto Rico

1. Seismograms
Selected seismograms at the Denver Federal Center from this earthquake were scanned as part of the IASPEI Scanning Project (small PDF versions of large .tif files lilnked below).

link to compressed .tif file format) (includes little .jpg "thumbnails").

2. Selected Information
This earthquake was widely felt throughout Puerto Rico and neighboring islands. Although this earthquake was of significant magnitude (7.5Mw), there was no structural damage anywhere on the island of Puerto Rico. No tsunami observed (O’Loughlin and Lander, 2003). This event begins a decade-long sequence of major earthquakes in the north- central Caribbean. Studied by Dolan and Wald (1998). Source mechanism using waveform inversion completed by Doser et al. (2005).

3. References

Dolan, J.F., and D.J. Wald, The 1943 – 1953 north-central Caribbean earthquakes: Active tectonic setting, seismic hazards and implications for Caribbean- North America plate motions, in Active Strike-Slip and Collisional Tectonics of the Northern Caribbean Plate Boundary Zone, edited by J.F. Dolan and P. Mann, Spec. Pap., Geol. Soc. Am., 326, 143-169, 1998.

Doser, D., C. Rodríguez, C. Flores, 2005, Historical Earthquakes of the Puerto Rico – Virgin Islands region (1915 – 1963), P. Mann ed., GSA Special Paper 385, Active tectonics & seismic hazards of PR, the virgin islands, and offshore areas, 103-115

O’loughlin and Lander, 2003, Caribbean Tsunami, A 500-Year History from 1498-1998., Kluwer Academic Publishers, p 261.

(Last Updated: January 3, 2010) (mfd)