Estimating magnitude and location from macroseismic data of the 1925 Colombian earthquake

The earthquake of 7 June 1925, which occurred in south-western Colombia, is one of the most important intraplate seismic events in the region. This earthquake caused damage at several localities along the Cauca valley. The distribution of the intensity data points reveals a trend line in the SW-NE direction, corresponding to the Andean mountain range, which coincides with the strike of the main geological faults existing in the SW of the country. In this work, earthquake parameters are computed from macroseismic data. The moment magnitude obtained is 6.6 +/- 0.2. The epicentre is located at the coordinates 3.29 degrees N and 76.91 degrees W, at approximately 50 km SW from the town of Cali.