Spatial heterogenity of slip on finite faults in the Kuril-Kamchatka Segment of the Pacific subduction zone

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Abstract

The study aims at gathering detailed information on source-related seismic radiation patterns in the interaction zone of Pacific and North American lithospheric plates (the Kuril-Kamchatka segment). To achieve our goals, we have developed a program capable of mapping zones of relatively high slip and assessing their area based on GIS data. We have analyzed the asperity distribution on a fault plane. A stochastic model of subduction-related interplate earthquakes has been proposed in the framework of fragmentary-based source model. The obtained results can further be used in a stochastic simulation of a catalogue of finite faults for the Japan-Kuril-Kamchatka island arc.

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About the authors

Alexey V. Konovalov

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: a.konovalov@geophystech.ru
ORCID iD: 0000-0003-2997-1524

Candidate of Sciences in Physics and Mathematics, Leading Researcher

Russian Federation, Yuzhno-Sakhalinsk

Evelina E. Voronezhtseva

Sakhalin State University

Email: evorone@mail.ru

Student

Russian Federation, Yuzhno-Sakhalinsk

Yulia A. Stepnova

Far East Geological Institute, FEB RAS

Email: stepnova@fegi.ru
ORCID iD: 0000-0001-5263-5161

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

Russian Federation, Vladivostok

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Supplementary files

Supplementary Files
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2. Fig. 1. Geometry of the seismic rupture plane

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3. Fig. 2. Earthquakes in the region of Kurilo-Kamchatka island arc with magnitude M ≥ 7.0 (1-10), for which data on distribution of finite fault motion vector are available [17]

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4. Fig. 3. Distribution of motion vector on the rupture plane on 11 March 2011 at 5:46 in Tohoku (Japan). Epicentre of this earthquake was located at the point with coordinates 38.297°N, 142.373°E. Moment magnitude was Mw 9.1, strike angle (Str) - 198.0°, dip angle (Dip) - 15.0° [19]

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5. Fig. 4. Subduction and seismotectonic process model for the Kuril island arc. The earthquake number in the figure corresponds to the sequence number given in Table 1

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6. Fig. 5. Surface projection of rupture segments. The earthquake number in the figure corresponds to the ordinal number given in Table 1. Bold line indicates the imaginary exit of the rupture to the free surface. Dark colour indicates segments with mobility values two and more times greater than the average mobility over the whole rupture, light colour shows the rest of the zone

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