Analysis of Spatial Clustering of Seismic Events in the Northwest Pacific Ocean

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Abstract

The spatial clustering of epicenters of seismic events in the Northwest Pacific Ocean is analyzed using the Discrete Perfect Sets (DPS) topological filtering algorithm. The results of the analysis are presented in this paper. Based on the data shallow earthquakes recorded from 1963 to 2022 by the seismic network of the Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences, stable areas of epicenter clustering are identified. These areas are associated with the Northern and Southern segments of the Kuril-Kamchatka seismofocal zone and do not depend on the time of recording of the earthquakes. The characteristic clustering radius for the Kuril-Kamchatka seismofocal zone is determined and is found to be 42–44 km. The analysis has confirmed the unique pattern of seismicity in the territory of the Commander segment of the Aleutian arc, which differs from that observed in the Northern and Southern segments.

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About the authors

A. S. Agaian

Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences; Moscow State University

Author for correspondence.
Email: nastaagaian@mail.ru

Faculty of Geology

Russian Federation, Moscow, 117997; Moscow, 119991

A. K. Nekrasova

Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences

Email: nastia@mitp.ru
Russian Federation, Moscow, 117997

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Supplementary files

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2. Fig. 1. Seismicity zones of the Kamchatka region and its environs: (a) [Levina et al., 2013] – surface section (1 – seismofocal zone of the Kuril Islands and Southern Kamchatka; 2 – northern part of the Kamchatka seismofocal zone; 3 – Commander segment of the Aleutian Arc). The dotted line marks the area of responsibility of the regional network; (b) – 3D.

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3. Fig. 2. Spatial distribution of earthquake epicenters, h ≤ 70, clustered by the DPS algorithm (q = -2 and  = -0.5) (a) for events with magnitude M ≥ 4.4 recorded from 1963 to 2022; (b) for events with magnitude M ≥ 3.5 recorded from 1996 to 2022

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4. Fig. 3. Spatial distribution of earthquake epicenters with M ≥ 4.4 and h ≤ 70, clustered by the DPS algorithm (q = -2 and  = -0.5), recorded: (a) from 1963 to 1982; (b) from 1983 to 2000; (c) since 2001 until 2022 .

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5. Fig. 4. Spatial distribution of earthquake epicenters, M ≥ 3.5, h ≤ 70, clustered by the DPS algorithm (q = -2 and  = -0.5), registered: (a) from 1996 to 2003; (b) from 2004 to 2014; (c) from 2015 until 2022 .

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6. Fig. 5. Spatial distribution of earthquake epicenters M ≥ 3.5, h ≤ 70 registered in the territory of the K–K seismic focal zone: (a) from 1963 to 1983; (b) from 1984 to 2000; (c) from 2001 to 2022, grouped by the DPS algorithm (q = -2 and  = -0.5).

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7. Fig. 6. Spatial distribution of earthquake epicenters M ≥ 3.5, h ≤ 70 recorded from 1996 to 2022 in the zone of the Commander segment of the Aleutian Arc, grouped into clusters by the DPS algorithm (q = -2 and  = -0.5).

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