SEISMIC MAGNITUDE AND SPECIFIC ABSORPTION COEFFICIENT IN THE IBERIAN REGION.
INSTITUTO GEOGRAFICO Y CATASTRAL MADRID (SPAIN)
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In the report is presented the magnitude scale used by Spanish Seismological Survey SSS for near earthquakes inside the area 5 degrees E-10 degrees W, 35 degrees-44 degrees N, which has been deduced from shear waves and with an explicit term for the specific absorption. The way for computation this coefficient is the difference between a theoretical expression for log E and other empirical one, which was previously determined for the Toledo Observatory. The method requests this base-station, besides the new standard calibration made for the other four stations handled and also abundant events and the corresponding m values as preliminary deduced by Laboratorio Central del Servicio de Sismologia LCSS, Madrid, since 1961 up to 1964. We have obtained Q62.5 delta degrees 67 plus or minus 32 for 1.5 or delta degrees or 7.5 the average Q300 is assumed for the whole crust in the said area. Author