Abstract
Abstract. In the last decade, there has been growing interest in problems related to searching global spatiotemporal regularities in the distribution of seismic events on the Earth. The worldwide catalogs ISC were used for search of spatial and temporal distribution of earthquakes (EQ) in the Pacific part of South America. We extracted all EQ from 1964 to 2004 with Mb>=4.0. The total number of events under study is near 30 000. The entire set of events was divided into six magnitude ranges (MR): 4.0
Highlights
The search for global regularities in the latitudinal distribution of earthquakes even in the epoch of the formation of seismological science demonstrated a clear inhomogeneity in the distribution of epicenters over the Earth despite low representativeness of the observational material in the middle of the 20th century (Gutenberg, Richter, 1954).Quantitative estimates of earthquake distribution by latitudinal zones of the planet based on electronic catalogues were obtained firstly by Mogi (1985), (Sun, 1992; Levin and Chirkov, 2001)
It was shown that the seismic activity of the planet, which is almost absent at the poles and polar caps of the Earth, increases significantly at mid-latitudes reaching the maximum in the region of 40◦–50◦ N and 10◦–20◦ S with a stable local minimum near the equator
Double normalized latitudinal distributions of the EQ number (Fig. 1) have clearly expressed bimodal character with two peaks located in Northern Hemisphere (40◦–50◦ N, i.e. Kuril Islands and Japan) and in Southern Hemisphere (20◦–30◦ S, i.e. Oceania northward to New Zealand and South America), local minimum near the equator (10◦–20◦ N) and almost zero values in the regions of the polar caps
Summary
The search for global regularities in the latitudinal distribution of earthquakes even in the epoch of the formation of seismological science demonstrated a clear inhomogeneity in the distribution of epicenters over the Earth despite low representativeness of the observational material in the middle of the 20th century (Gutenberg, Richter, 1954). Taking into account the fact that the earthquakes occur generally along the boundaries of the lithosphere plates and that the modern kinematics of the plate boundaries is studied quite well was applied normalizing the number of events in the latitudinal zone by the total length of the plate boundaries in the given zone (Levin and Sasorova, 2009). Double normalized (binormed) latitudinal distributions of the EQ number (Fig. 1) have clearly expressed bimodal character with two peaks located in Northern Hemisphere (40◦–50◦ N, i.e. Kuril Islands and Japan) and in Southern Hemisphere (20◦–30◦ S, i.e. Oceania northward to New Zealand and South America), local minimum near the equator (10◦–20◦ N) and almost zero values in the regions of the polar caps. Lines correspond to peaks of binormed distribution; blue number of seismic event generated per one kilometer of plate dotted lines correspond to local minimum and green dotted line is boundary. We obtain average relative situated orendeqduoatttoerd. lines correspond to peaks of binormed distribution; blue number of seismic event generated per one kilometer of plate dotted lines correspond to local minimum and green dotted line is boundary. situated on equator
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