Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seasmograms in Sweden 69Obviously, the method cannot reveal all fine details of a rather complex ruptureprocess. On the other hand, as illustrated by the Parkfield and northern Algeriaexamples, basic information on faulting styles may be revealed by the comparativeanalysis described above. It seems that this is one of a few currently availablemethods for studying focal processes of large earthquakes, in more active areas,from the beginning of this century when the geographical coverage by seismographstations was rather poor and seismograms were scarce.ACKNOWLEDGEMENTSI wish to thank my colleague W. Y. Kim for discussing the subject and forproducing the computer plots.REFERENCESAlsan, E., L. Tezucan, and M. B%th (1975). An earthquake catalogue for Turkey for theinterval 1913-1970, Kandilli Observatory, Istanbul, and Seism. Inst., Uppsala, Report7-75, 166 pp-Clark, R. D. (1984). Earthquake prediction, Geophysics: The Leading Edge of ezploration,3(8), 24-28.Deschamps, A., Y. Gaudemer, and A. Cisternas (1982). The El Asnam, Algeria, earthquakeof 10 October 1980: multiple-source mechanism determined from long-periodrecords, Bull. Seismol. Soc. Am., 72, 1111-1128.McKenzie, D. P. (1972). Active tectonics of the Mediterranean region, Geophys. J. R.Astr. SOC., SO, 109-185.RothC, I. P. (1969). The Seismicity of the Earth Ig53-1965, UNESCO, 336 pp.Singh, S. K., M. Rodriguez, and I. M. Espindola (1984). A catalogue of shallow earthquakesof Mexico from 1900 to 1981, Bull. Seism. SOC. Am., 74, 2G7-279.