Abstract

SALCEDO HURTADO, Elkin de Jesús  and  CASTANO CASTANO, Alba Nidia. MACROSEISMIC RE-ASSESSMENT OF THE EARTHQUAKE OF JULY 12^th , 1785 IN COLOMBIA. bol.geol. [online]. 2011, vol.33, n.2, pp.15-32. ISSN 0120-0283.

The earthquake on July 12, 1785, has been one of the largest shocks in central Colombia. It has left heavy damage in the capital and its surroundings. In files and libraries across the country is located the information left by eyewitnesses who describe the damages and effects in different populations. Several researchers have used this information to make assumptions on macroseismic intensity, applying the Modified Mercalli Scale, MCS and EMS-92. The intensity values reported are conflicting in many cases, and some give wrong interpretations of the information. In the present work is the re-evaluation using the EMS-98, giving new hypothesis of intensity where the maximum value is assigned to Santa Fe, and it also presents the corresponding map of intensity data. The spatial location of the intensity points shows that the effects left by this earthquake spread throughout the Andean Cordillera belt along a linear trend in SW - NE, also coinciding with the trace of the main active faults at the region.

Keywords : Earthquake; seismic intensity; macroseismic scale EMS-98.

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