Modelo de velocidades sísmicas de Cuba Oriental

Abstract

This study determines a one-dimensional seismic velocity model to be used in the daily routine analysis of earthquake data. This is useful for the geographical localization of the seismic events as well as an initial model for 3D seismic tomography studies. In order to calculate the velocity model, the Cuban earthquake catalogue from 1998 until the 2004 was used. The chosen area for the study is located in the eastern part of the Cuban Island, specifically between 19.80-21.00 north latitude and 74.33-77.00 west longitude. From a total of 209 local events, 117 events with RMS between 0 and 1 seconds, GAP between 0-180° and recorded for 3 or more stations were selected. The obtained velocity model has mainly three layers. A shallow layer 1 km-thick and P-wave velocity of 3.6 km/s, an intermediate layer 6 km-thick and P-wave velocity of 5.8 km/s and a bottom layer 13 km-thick and P-wave velocity of 6.9 km/s. The results suggest a transitional crust with an average thickness of 20 km.