El temblor de Huajuapan de León, Oaxaca, México, del 24 de octubre de 1980

Abstract

The analysis of arrival times and first motion data indicates that the focus of the October 24, 1980 (14:54 GMT; 6.6 mb; 7.0 Ms) Huajuapan de León, Oaxaca earthquake islocated at 18.03°N and 98.20°W and 65 km deep inside the Continental Plate. The main rupture occurred as normal faulting probably along a fault striking N 88º W and dipping approximately 26º toward NNE. The aftershock activity defines a 32 km long and 10 km wide elongated area oriented NW-SE. The seismic intensity distribution shows a clear amplification toward the sou theast as compared to the north due possibly to an energy focusing phenomenon, caused by the orientation of the fault and the rupture mechanism itself.