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INSTITUTO DE GEOFISICA UNAM, C.U. MEXICO 04510, D.F. Mexico
INSTITUTO DE INGENIERIA UNAM, C.U., MEXICO04510, D.F. Mexico
Abstract
A catalog of shallow earthquakes (depth
65 km) of Mexico (15° to 20°N, 94.5° to 105.5°W) covering the period 1900 to 1981 is presented. The catalog includes only those events whose magnitudes (M, Ms, or magnitude from Pasadena) are
5.9. It is most likely complete for shocks with Ms
6.5 from July 1906 to December 1981. For many shocks, Ms has been determined from Uppsala bulletins and/or Uppsala and Göttingen Wiechert Seismograms. The statistics of incremental frequency n(Ms) shows a peak at Ms
7.7, reinforcing a previous observation by Singh et al. (1981). In the range 6.4
Ms
7.5, the observed n(Ms) deviates significantly from an exponential distribution. The catalog provides a basis for further statistical analysis of earthquakes in Mexico.
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