A coda-length magnitude scale for some Mexican stations

Abstract

An empirical coda length magnitude scale is developed for some Mexican short period stations using a least squares regression of mb versus log10T, where T is the coda-length in seconds. A total of 61 events in the magnitude range 4.0 5.8 and recorded on up to 12 stations were used, giving the following average relation Mc= -1.59+ 2.40 log10T+ 0.00046xD, where Mc is the coda-length magnitude and D the epicentral distance in km. Furthermore, station corrections to be added to magnitudes obtained by the average relation were calculated for all 12 stations.