catalogo de terremotos para america del sur catalog of earthquakes ...

INTRODUCTION
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CATALOG OF EARTHQUAKE FOP BOLIVIA
HYPOCENTER AND INTENSITY DATA
NATIONAL REPORT
Angel Vega
Estela Minaya
Ram6n Cabr6 S.J.
Good catalogs both of seismic foci and intensity data have been a dream
of many years in the Observatorio San Calixto.
The father of seismology in the country, Pierre M. Descotes S.J. has
been collecting all available materials, being his main sources Ballivi~n
(1909) and Montessus de Ballore (1912-1916), for ancient earthquakes.
A light increase in resources (always so meager in Bolivian seismological
work) through the project SISAN (sponsored by the Organization of American
States) made possible a first systematization of seismological informa ­
tion concerning Bolivia, beginning with those old Descotes' papers, continuing
with locations obtained by world seismological agencies such as the U.S.
Coast & Geodetic Survey, continued by the National Oceanic and Atmospheric
Administration and finally by the U.S. Geological Survey, and the Internationai
Seismological Summary, continued by the present International Seismolo­
gical Centre.
Vega had the primary responsibility over the critical revision and completion
of the hypocenter catalog. Minaya was responsible for the intensity
catalog. Cabr assisted mostly with the use of available sources. Remberto
Cardona and Marcos Capriles complemented readings mostly dealing with small.er
Bolivian earthquakes and preparing that data for epicenter computation as a
background control for probability of destructive earthquakes.
MATERIAL USED
Preliminary catalogs produced within the SISAN Project have been critically
revised and complemented.
The hypocenter catalog had been obtained basically after the hypocenter
determiantions published by Gutenberg and Richter (1949), those of the International
Seisnological Summary, U.S. Coast and Geodetic Survey (and con ­
tinuing institutions through the U.S. Geological Survey) and the International
Seismological Centre.
The catalog has been continued until the end of 1981, using determinations
of both the U.S. Geological Survey and the International Seismological
Centre. A few of those determinations (obtained from data of remote seismographs)
had to be recalculated in the Observatorio San Calixto, using dependable
readings of near seismographs (The anomalously low velocity beneath the