Physics – Geophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmng51b1017s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #NG51B-1017
Physics
Geophysics
3215 Instability Analysis, 3252 Spatial Analysis (0500), 3270 Time Series Analysis (1872, 4277, 4475), 4400 Nonlinear Geophysics (3200, 6944, 7839)
Scientific paper
The earthquake (EQ) occurrence is considered now as a random phenomenon. But it was observed during written history that the seismic events occur in various regions of the Earth in some months of a year significantly more often than in another. If the variability exists, then occurrences of the seismic events depend on the position of the Earth -Moon system on ecliptic plane or on factors that are varied during motion of the Earth-Moon system along ecliptic plane. The goal of our work is testing of hypothesis about within-year variability existence for the events of various energy levels (from Mb >= 4.0) for the Pacific region (PO). The whole PO was subdivided into 31 subregions (Japan, Kuril Islands, Kamchatka, Aleutian Islands, Alaska, California, and so on along the perimeter of the Pacific). The worldwide catalog ISC was used for analysis of annual earthquake distributions. The aftershocks were canceled from the list. All events for each region were divided into following magnitude levels: 4 <= Mb < 4.5; 4.5 <= Mb < 5; 5 <= Mb < 5.5; 5.5 <= Mb < 6.0; 6 <= Mb. And the events in each magnitude level were subdivided once again into two groups: shallow events (H <= Htr) and deep events (H > Htr), where Htr is depth threshold value. Then we are checking if the distributions of the events during the year period are uniform or these distributions are nonuniform. We are testing it separately for each region, for every magnitude level and for every depth level. It was disproved the null hypothesis about uniform EQ distributions in the course of year for shallow events (with less than 5 percents of significance level), and it was confirmed the null hypothesis for deep earthquakes. It was found that the Htr boundary between the shallow and deep events was arranged at deep 60-80 km. The noticeable increase number of seismic events in short time intervals as a rule two times in year, and significant reducing of seismic activity in the rest part of the year was shown. It was determined where peaks of seismic activity are located. We detect two more significant peaks for each distribution and we take into considerations only distributions for shallow events. The locations of these peaks vary from one region to another and they vary also for different MRs. It was shown that the main maximum of the seismic events occurs from November to March (minimum of the Earth-Sun distance).
Levin Boris W.
Sasorova E. V.
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