Microseismicity and stresses in the Lesser Antilles dipping seismic zone

Details Microseismicity and stresses in the Lesser Antilles dipping seismic zone Microseismicity and stresses in the Lesser Antilles dipping seismic zone

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..340g&link_type=abstract

Earth and Planetary Science Letters, Volume 62, Issue 3, p. 340-348.

Computer Science

9

Scientific paper

Microearthquake data from a telemetered array have been used to study the central Antilles arc system. The zone lying between lat. 14-17°N and long. 59.5-62°W has been investigated. During the period 1979-1980 no shock with a magnitude larger than 4.5 was recorded. Results are well correlated with previous conclusions derived from teleseismic records. The dip of the subducting plate is 60° everywhere in this area. No composite focal mechanism can be produced for the region north of Dominique. For the southern region, composite focal mechanisms reveal two zones: For depths between 45 and 80 km, the stress field seems mainly related to the interplate action. Beneath 80 km, the slab dominantly neither in compression nor in tension, earthquakes are more likely related to local stress fields. A double-layered structure has not been found in the earthquake distribution in the subducted plate nor in the stress field deduced from focal mechanisms.

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