Two attempts of study of seismic source from teleseismic data by simulated annealing non-linear inversion

摘要: Two seismic source studies usingteleseismic data are performed by Simulated Annealing(SA), a non-linear inversion method. The Very FastSimulated Annealing (VFSA) algorithm is used and onlyteleseismic inverted. We have designed fastand efficient way of multiple direct problemevaluation, which based on pre-calculating theelementary Green's function. During the process we setthe values control parameters(temperature, number iterations) modified thecooling schedule. In current version, theinversion seeks for point mechanism, thedepth source, scalar moment sourcetime function (STF). method applied to twoearthquakes: 18 Nov. 1992 in Greece, M 5.9 14 Sep.1995 Mexico, M7.3. calculation ona simple 1D model structure. For firstearthquake recovered solution fairlywell; second was less acceptable.However, do not consider this fact be failureof method, but consequence an inadequatemodel medium Acasual attempt reliability determination alsoperformed; obtained errors arereasonable, except few cases when methodfailed.