Time-Dependent Fractal Characteristics of Sets of Seismic Eventsстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Abstract — The spatial and temporal interrelations in a set of seismic events were studied using catalog data on M>1 earthquakes in the Garm area (the junction zone between the Pamirs and Tien Shan) over the period from 1955 through 1991. For this purpose, the correlation integrals (CIs) over both distance and time were calculated for pairs of seismic events. The CIs were calculated separately for earthquakes closely and widely separated in time, if the current parameter was distance, and for events close and remote in space, in the case of integration with respect to time. The calculations showed that mean Cl slopes for events that are close in time and space are much smaller than for widely spaced events. This result indicates that events close in space (time) are more ordered in time (space) than widely separated events. The Cl curves calculated for events close in time have bends at separations of about 3, 10, and 40 km. This fact may be considered as evidence for the presence of
characteristic elements with the aforementioned linear dimensions in the set under consideration. Based on such treatment of the time component of the seismic process, the above pattern o f the variation in the IC curve was also revealed in the analysis of two catalogues of earthquakes in the Caucasus (1962-1990, M > 2.5) and Fennoscandia (1972-1992, M > 4).