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

132
In column 131 (non-tectonic phenomena) a blank character was assigned
b', because it was estimated that all of the earthquakey of the catalog are
of tectonic origin.
All of the data for maximum intensities, in the catalog for hypocenters,
were obtained from documents which are on file at the Department of Geophysics
of the University of Chile (GUC).
The code SI T wais added as the source for the calculated magnitude, and
this corresponds to the code letters for the seismological staLion Santa Lucia.
In prepar ng the Catalog of Intensities, information provided by E. Silgado
was used (1983, personal letter) for three earthqluakes (1730, 1751 and
1822) and information compiled by E. Kausel (1979f) for the events of 1868
and 1877. This constitutes the catalogue of intenit ies corresponding to
earthquakes whici occurred before 1900.
For the present century, the following information has been used: Montessus
de BaJ.loere (1911-1916) for the Valparaiso earthquake of 1906; Bobillier
(1930), for the ]928 earthquake, mod if ed by Kausel (1979b); Ei-senberg et al
(1972); Kausul (1965-1977); a great amount of data compiled by F. Greve
(1949) in "(Ca Las de Curvas Isos tas", upnpublished; and data from the archives
of the Department of Geology and Geophysics which have been summarized
by Barriantps (I8 1) and others who appear in the references. In the Cartas
de Cuirvas Isosi.s Las the point imtensitius are indicated on a scale from I to
VI. To *onvert t honc ntensitius; to the ercalli scale the criterium used
was to multipiv the Greve intensiti es by a fartor of two and to substract one
"i i t from the resul t.
1c' the coorlinate (t-fold localities, towns and cities, Risopatr5n
(19 2 4) has been consulted. For the earthquakes of 1868 and 1877, names of
localities, for which their coordina.n are unknown, appear; poss. lv the,,
correspond to p1 a- s in southern PerNi, western Bolivia or Chilean localities
which have been abandoned or have changed their name. In these cases . the
corresponding space, in the catalog of intensities, has been left blank.
DeptLhs for earthquakes prior to 1900, have not been estimated, in general,
so that this information has also been left blank in the corresponding
space.
The elevation of the places for which intensities are given, has been
obtained from maps, documents, texts, etc. For some coastal sites and towns
tihe elevation has been estimated at 10 meters.
For the cal culation of hypocentral distances, a straight line between
the hypocenter and the observation point is used, without considering the
elevation of the place.
When two different intensities are shown for the same locality, the real
intensity rorcrrlond; to the information of intensity which is between the
two values indicated. For example, Santiago V-V1 appears in the intensity
catalog as Santia go V and Santiago VI.
ADDITIONAL REFERENCES: See page 32.