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Article information
2019 , Volume 24, ¹ 1, p.73-85
Nosov M.A., Kolesov S.V., Nurislamova G.N., Bolshakova A.V., Sementsov K.A., Karpov V.A.
The role of Coriolis force in the dynamics of the waves excited in the ocean by deep-focal earthquakes
Using the example of a seismic event with the same magnitude and mechanism as for the 2018 Fiji deep-focus earthquake the relationship between the parameters of a tsunami source and the depth of an earthquake was theoretically investigated. It is shown that strong deep-focus earthquakes are capable of creating extensive areas of co-seismic deformations for the ocean bottom, the size of which is comparable to the barotropic Rossby deformation radius. Tsunami waves generated by such sources have an unusually large length, and therefore they are subject to the influence of the Coriolis force. The influence of the Coriolis force on the weak tsunami waves caused by the 2018 Fiji earthquake has been studied by numerical simulation. It was found that for a virtual sea-level station located to the south of the source at latitude of 40∘ S, the amplitude of the leading tsunami wave under the influence of the Coriolis force decreased by ≈ 30%. For virtual stations located at the equator or at latitude of 20∘ S, taking into account the Coriolis force changes the amplitude of the waves by no more than 10%. For stations located in the equatorial zone, the effect of delaying of the manifestation of differences in sea-level fluctuations, calculated with and without Coriolis force, as compared with the entry of the leading tsunami wave was discovered. A physical interpretation of the observed delay effect is proposed.
[full text] [link to elibrary.ru]
Keywords: deep-focus earthquake, tsunami, shallow water theory, Coriolis force, Rossby deformation radius, numerical simulation
doi: 10.25743/ICT.2019.24.1.006
Author(s):
Nosov Mikhail Aleksandrovich
Dr. , Professor
Position: Leading research officer
Office: Lomonosov Moscow State University, Institute of Marine Geology and Geophysics
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: nosov@phys.msu.ru
SPIN-code: 2040-0440Kolesov Sergey Vladimirovich
PhD.
Position: Senior Research Scientist
Office: Lomonosov Moscow State University, Institute of Marine Geology and Geophysics Far Eastern Branch of Russian Academy of Sciences
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: kolesov@ocean.phys.msu.ru
SPIN-code: 9387-0681Nurislamova Gulnaz Nurovna
PhD.
Office: Lomonosov Moscow State University, Institute of Marine Geology and Geophysics Far Eastern Branch of Russian Academy of Sciences
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: nurislamova@physics.msu.ru
SPIN-code: 5112-2401Bolshakova Anna Vladimirovna
PhD.
Office: Lomonosov Moscow State University, Institute of Marine Geology and Geophysics Far Eastern Branch of Russian Academy of Sciences
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: annabolshakova@list.ru
SPIN-code: 1823-1216Sementsov Kirill Aleksandrovich
PhD.
Position: expert
Office: Lomonosov Moscow State University
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: sebbest@yandex.ru
SPIN-code: 5370-7435Karpov Vyacheslav Aleksandrovich
Position: Student
Office: Lomonosov Moscow State University
Address: 119991, Russia, Moscow, GSP-1, 1-2 Leninskiye Gory
Phone Office: (495)939-36-98
E-mail: va.karpov@physics.msu.ru
SPIN-code: 7081-4143 References:
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Bibliography link:
Nosov M.A., Kolesov S.V., Nurislamova G.N., Bolshakova A.V., Sementsov K.A., Karpov V.A. The role of Coriolis force in the dynamics of the waves excited in the ocean by deep-focal earthquakes // Computational technologies. 2019. V. 24. ¹ 1. P. 73-85
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