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pure and applied geophysics

, Volume 146, Issue 1, pp 43–66 | Cite as

Source processes of large (M≥6.5) earthquakes of the Southeastern Caribbean (1926–1960)

  • Diane I. Doser
  • Shelley R. Vandusen
Article

Abstract

We have conducted body waveform modeling studies of 13 historic earthquakes to provide a better understanding of the long-term spatial and temporal pattern of seismicity and deformation within a region extending from Barbuda, Lesser Antilles, to Cumana, Venezuela. Our results suggest that shallow earthquakes (<50 km deep) along the South American-Caribbean plate margin reflect right-lateral and extensional deformation. Intermediate depth events (≥100 km) show left-lateral strike-slip motion beneath the Paria peninsula of Venezuela. In the Lesser Antilles the 1960 Barbuda and 1946 Martinique earthquakes appear to be interplate thrust events, however the greatest moment release in the region has occurred at intermediate depths as a mixture of normal and strike-slip faulting, generally along trends oblique to the arc. The deformation rate estimated from the seismic moment release between 1926 and 1960 is only 1 to 10% of the estimated plate convergence rate for the region.

Key Words

Historic earthquakes southeastern Caribbean earthquakes 

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Copyright information

© Birkhäuser Verlag 1996

Authors and Affiliations

  • Diane I. Doser
    • 1
  • Shelley R. Vandusen
    • 1
  1. 1.Department of Geological SciencesUniversity of Texas at El PasoEl PasoUSA

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