Abstract
This paper presents the results of analysis of the spatial distribution of repeated shocks. Data from the world earthquake catalog of USGS/NEIC from 1973 to 2014 were used. Short time intervals, no more than 10 hours after the main shock, and distances from the epicenter of the main shock, no more than 5°, were considered. The dependence of the number of repeated shocks on the distance from the epicenter was studied. Two properties of the spatial distribution of repeated shocks have been identified. The first property is that the curve describing spatial distribution has its maximum at a certain distance (approximately from 10 to 120 km) from the epicenter of the main shock. The logarithm of this distance is directly proportional to the magnitude of the main shock. The second property is that the position of the maximum does not depend on time, i.e., it is a stable spatial characteristic of the earthquake source. Based on these properties, a new way to determine the size of the rupture zone was proposed.
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ACKNOWLEDGMENTS
We express our gratitude to A.V. Guglielmi and B.I. Klain for many helpful discussions.
Funding
This work was carried out with partial financial support from the Russian Foundation for Basic Research (project no. 18-05-00096), as well as the State Task Programs of the Schmidt Institute of Physics of the Earth RAS.
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Zavyalov, A.D., Zotov, O.D. A New Way to Determine the Characteristic Size of the Source Zone. J. Volcanolog. Seismol. 15, 19–25 (2021). https://doi.org/10.1134/S0742046321010139
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DOI: https://doi.org/10.1134/S0742046321010139