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

Institute Sismol 6 gico .. :vw iad Nacional de San Juan, were
installed and contribut, i A.a.
It was only after 1982, when the National Seismological Network was implemented
by INPRES, that it has been possible to calculate seismological
parameters in a continuous and reliable manner, specialvy for the provinces
of San Juan :nd Ienduza.
In order to integrate the catal]g, cf hypocenters and intensities, all.
of the existing, information was compiled, including some quantitative determinations
made by the institutions above mentioned, generally for short
periods of tLime and sometimes withouit speciafying the methodology used.
Fu'rthermore, a great quantity of new information, pertinent to destructive
earthquwnakes , obtnained from different historical archives, specially newspaper;
and magazines of the time, for different places in the country was
added. 'Thns, an archive with all of the available data of the Argentine
seismic activity was cnmpleted; it was then processed by computer. Archives
were -encrated grouping the events by latitude/longitude and chronologically
by dates, so that they can be used for different studies and applications.
With information now available, more complete than that from the international
centers: NOAA, NEIS, US-COAST, ISC, etc., a comparison was made
between the INPRES data and that from the international centers. In this
manner all of the available seismic information was processed resulting in
the present catalog of Argentine earthquakes, in SISRA format. We are now
keeping the catalog up to date with all of the available information.
The same procedure carried out for the hypocenter catalog was adopted
for the intensity catalog.
METhODS USE) IN THE DEVELO 1)IHMENT OF TIIE CATALOG
1. iiypocenter Parameters
'or the preparation of the catalog the hypocentral parameters and complementary
information were processed in accordance with the present SISRA
requirements, including data of macroseismis, based on historical information,
instrumental data obtained from international sources and that from local
sources, for local events.
The method used was to make all of the information compatible, by means
of a comparison process by computer to select the best information from two
or more events with different sources but with similar times of origin and
epicentral coordinates and the same dates; in such cases, it was left to the
ar""r n to maps the selection on the basis of quality factors and complemen­
':. diata.
In this manner all of the existing information was convalidated and
ordered chronologically.
The parameters determined with data from the INPRES instrumental net
have been added to the catalog since 1981.