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

134
for different projects, such as SISAN of CERESIS, the Commission for the
Study of an Interoceanic At lan tic-Pacific Canal and Woodward-Clyde Consultants
for the Canucai River. The most important is the tHistoria de los Terremotos de
Colombia, spec iala.1v tie second and final edition (1975).
Naturally, a large number of technical of the Insti -uto Ceofisico collaborated.
The pil-eSCn catalog oF hypocen tecs and intensit ies for project ,ISRA
was prepared under tLhe diri ction of the National Coordinator, P.J. Rafael Goberna,
.,., Directoro f t],, Insr:itutit Genfisico de los Andes Colombianos
(Univers:dnd Jav,,ia:nia.) with the coL ho rattion of Mes rs. Juan A. DIuratc, Tito
A. Vargas, William Arias and Timoleoo Palencta, of the snme InsLitute and
members of the inslit at (eogrl-fico "Agustin Codazzi". They are responsible
for m:n' of to -imi c it erpretat ions and the determination of a great number
of hpcl ra! pjaramieters (ICE); the estimate of intensities was done by
a grolF of sLU-ldnt s of the Universilad de Ios Andes, under the supervision
and di necLioi of Dr. \lberto Sarria Molina.
'.1 AL,:'*,USED
For the historical epicenters, the principal source is the publication
of P. Ramirez "listora de los Torremotos de Colombia" (segunda edicin, 1975),
since it includes daLa obtained from the original sources, on which arc based
many of tLhe determinatinns of the adopted seismic parameters. The original.
I.SLin, are included at tie end of the publication, with the corresponding
r'eferenc'es. For the instrumental earthquakes the values included are those
published by , tho:', on inst i tntions generally accepted, such as 9. Gutenberg
and Ch. r. Nichce-, U .S. CoL;t & Geodetic Survey (and subsequent organizations
such NOAA, NON, and the present NETS), ISS, ISC and BCIS.
n other rass, for hi:S torical earthquakes not included in the publica -
tion of ....r. ir-ez, lie prin.ccipal source is tie Archive of the Instituto Geofisico
(ICF;.), With a refer:,e Lo ti original source from which the information
.nq obtainud. In the case of in-; trumental1 earthquakes, the data is taken
direct1v frm the srisnograms ana lyzed by personnel of the Instituto Geofsico
or from tHe publications of ISS and BCIS and then processed by manual
method; (EI) o by tompu ter (IYIP).
ovrnthleS, ii liet final Cnta giuc for Project SISRA, the va[ues given
by ISC ha,,- been included with preference over those of NETS, which we do not
believe to be compl etely correct, without a more careful analysis and, above
all, beca so i is not easy to have access to the I.SC data; this is even more
pertinent wihen it is a tinst .etiondata of obtained by LASA and LAO, since some
of their inFormation is not correct.
':;L'T 1VK',
The principal objective of project SISRA, in its first stage, is to
adopt and ue a common format so present the seismic information existing in
the institutions of the participating southamerican countries. It was also
int:ended to prepare provisional listings of the hypocenters and intensities
of the seismi events compiled by each country and to prepare maps of maximum
se ismir intensities and seismic zoning which would serve as a reference for