Statistical analysis of seismic data from north-western and western Argentina

OSELLA, A.,; SABBIONE, N; CERNADAS, D.

PURE AND APPLIED GEOPHYSICS

BIRKHAUSER VERLAG AG

Lugar: BASEL; Año: 1992 vol. 139 p. 278 - 292

0033-4553

Due to the process of subduction of the Nazca Plate, high seismic activity is observednear the Argentine Andean range between 21~ and 36~ The new version of the Argentine SeismicCatalogue, which includes well-defined events during the period 1964-I989, allows us to perform ananalysis of seismic risk.Earthquakes with epicenters in the provinces included in the north-western and western regions werestudied using Gumbel III extreme value distribution. Modal extreme magnitudes and return periods werecalculated for both regions and the results were compard with the ones obtained through the entireprocess techniques (both analytical and graphical).As a first study, we analyzed each province separately, after which mean values for each region wereobtained. Modal values around 5-5.5 have been found and times of recurrence for events with m b > 6of approximately 25 years were obtained.