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The neotectonics of the islands of Faial, Pico and S. Jorge (Azores) is presented. Preliminary paleoseismology&#13; data from trench exposures across three active fault zones (Lomba do Meio, Lagoa do Capitão and Pico do&#13; Carvão faults) complement the information. Radiocarbon age constraints of paleoearthquakes suggest clustering&#13; of surface rupturing events. Slip rates deduced from paleoseismology analysis range from 0.10 to 0.40 cm/year&#13; and validate long-term slip rates obtained by neotectonic studies (using Pleistocene markers). The studied faults&#13; allowed a preliminary seismic hazard assessment: magnitudes of the largest paleoearthquakes, determined from&#13; slip per event range from Mw = 6.9 to 7.1, and maximum expected magnitudes, estimated from rupture length or&#13; rupture area, vary from Mw = 6.4 to 6.8. The former Mw estimates are in closer agreement with the magnitude of&#13; the major historic and instrumental seismic events in the archipelago, even though the used empirical relations&#13; between magnitude and rupture parameters may not be the most adequate due to the unique tectonic setting of&#13; Azores

Active tectonics and first paleoseismological results in Faial, Picoand S. Jorge islands (Azores, Portugal)