Accession Number : AD0618611

Title :   A SEISMIC PROBABILITY MAP,

Corporate Author : INSTITUTO GEOGRAFICO Y CATASTRAL MADRID (SPAIN)

Personal Author(s) : Munuera,J. M.

Report Date : 03 OCT 1964

Pagination or Media Count : 15

Abstract : The material included in two former papers which sums 3307 shocks corresponding to 2360 years, up to 1960, was reduced to a 50 years period by means the weight obtained for each epoch. The weighting factor is the ratio 50 and the amount of years for every epoch. The frequency was referred over basis VII of the international seismic scale of intensity, for all cases in which the earthquakes are equal or greater than VI and up to IX. The sum of products: frequency and parameters previously exposed, is the probable frequency expected for the 50 years period. On each active small square, the corresponding computation was made and the Map No 1 drawn, in percentage. The epicenters with intensity since X to XI are plotted in the Map No 2, to present complementary information. A table shows the return periods obtained for all data (VII to XI), and after checking them with other computed from the first up to last shock, a list includes the probable approximate return periods estimated for the area. The solution is an appropriated form to express the seismic contingent phenomenon and it improves the conventional maps showing the equal intensity curves corresponding to the maximal values of given side. (Author)

Descriptors :   (*SEISMIC WAVES, MAPS), (*MAPS, SEISMIC WAVES), (*PROBABILITY, EARTHQUAKES), SPAIN, SEISMOLOGY, MATHEMATICAL PREDICTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE