Peculiarities of the within-year distribution of earthquakes in the Kuril region |
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Authors: | M Yu Andreeva E V Sasorova B W Levin |
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Institution: | (1) Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794, USA |
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Abstract: | Recent investigations have shown that the probability of the occurrence of earthquakes in a specified region depends on several
factors, such as the latitude of the study region, as well as the lunar and solar tidal forces, which are governed by the
mutual arrangement of bodies in the Sun-Earth-Moon system. The objective of our work is to prove that the irregularity of
the within-year distribution of seismic events in the Pacific regions (the Kuril Islands and Hokkaido Island) is a statistically
significant process, which is manifested in different ways for earthquakes with various source depths and energy levels. The
hypothesis about the uniform within-year distribution of earthquakes is refuted for shallow events. However, it is shown that
deep earthquakes are distributed uniformly. This work attempts for the first time to determine the stability degree of the
within-year irregularity of seismic events with respect to the observation time interval (from 28 to 5 years). Two peaks are
noted in the annual distribution of the earthquakes. The relation of the peaks of the within-year seismic activity to the
Earth’s position on the ecliptic plane, as well as the relationships between the peaks, the magnitude range of the events,
and the position of the specified subregion, is considered. The principal maximum of the seismic activity falls in the November-March
period, which matches the minimum Earth-Sun distance. |
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