Abstract
Data on earthquake focal mechanisms from the Bulletin of the International Seismological Center (ISC) have been used to study the effect of the choice of the nodal plane on the estimate for potential energy of the initial elevation in the tsunami source. For the majority of seismic events, the energy estimate has been shown to weakly depend on the choice of the nodal plane. However, in some rare cases, the energy estimates can differ significantly (by up to one order of magnitude). Usually, these significant differences are characteristic of strong shallow earthquakes, i.e., the seismic events that can effectively generate tsunami waves. In all cases when the ratio of the rupture length to the earthquake depth is small the choice of the nodal plane has almost no effect on the energy estimate.
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ACKNOWLEDGMENTS
The authors are grateful to the International Seismological Center for providing us with necessary data.
Funding
This work was supported by the Russian Foundation for Basic Research, project nos. 19-05-00351, 20-07-01098, and 20-35-70038.
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Translated by V. Arutyunyan
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Nosov, M.A., Kolesov, S.V., Bolshakova, A.V. et al. The Effect of the Choice of the Nodal Plane on Tsunami Energy Estimates. Moscow Univ. Phys. 75, 501–506 (2020). https://doi.org/10.3103/S0027134920050197
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DOI: https://doi.org/10.3103/S0027134920050197