Abstract
At 01:51 on 3 October 1995 (UT) a M w 6.8 earthquake located at 2.80°S, 77.96°W at a depth of 16 km (Figure 1) occurred on the southeastern flank of Cutucu cordillera, a NNE-SSW Jurassic-Cretacic anticline, located on the western edge of the Subandean zone (Figure 1). This uplift overthrusts the Eastern flank of the Subandean zone along several reverse N-S faults. No foreshock activity was detected before the main shock at the M l 3.0 detection level of the National Ecuadorian Network run by the Instituto Geofisico of the Escuela Politecnica Nacional of Quito. Four large aftershocks (magnitude ≥ 5.1) were observed within the first 4 days after the main event, including a m b 5.6 six minutes later and the M w 6.4 main aftershock eleven hours later. Three other aftershocks with m b 5.1 occurred in the period 21-29 October. About 750 aftershocks ( M l 3.0) were detected by the permanent network one...
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