ПРИМЕНЕНИЕ ДЕФОРМАЦИОННОГО МЕТОДА ПРИ АНАЛИЗЕ ЦУНАМИГЕННЫХ ЗЕМЛЕТРЯСЕНИЙ

С.Г. Долгих

doi:10.34753/HS.2022.4.1.8

APPLICATION OF THE DEFORMATION METHOD IN THE ANALYSIS OF TSUNAMIGENIC EARTHQUAKES

Authors

Stanislav G. Dolgikh V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия

DOI:

https://doi.org/10.34753/HS.2022.4.1.8

+ Keywords

tsunami, deformation anomaly, laser strainmeter, divergence coefficient, earthquake; elastic wave

+ Abstract

The deformation method for determining the degree of tsunamigenic of earthquakes according to the data of a non-uniform laser strainmeter was used in the analysis of tsunamis in the period from 2010 to 2018. The essence of this method is to identify the deformation anomaly (deformation jump) characteristic of a tsunamigenic earthquake. The presence of a deformation jump at the moment or after an earthquake indicates a displacement of the bottom, characteristic of the occurrence of a tsunami. When analyzing numerous data on variations of micro-deformations of the Earth's crust obtained using an unequal-beam laser strainmeter with a measuring arm length of 52,5 meters and a north-south orientation, deformation anomalies that occur during tsunami generation were revealed. Tsunamigenic earthquakes that occurred in three areas were identified - Indonesia, Chile and the west coast of North America. As a result of the assessment of deformation anomalies, general patterns of their propagation in three seismically active zones have been established. The main regularity revealed as a result of processing is the general law of divergence, confirming the fact of the connection of these deformation anomalies with the process of tsunami generation. The obtained divergence coefficients allow not only to determine the degree of earthquake tsunamigenic, but also to calculate the magnitude of displacement in the earthquake focus, based on the revealed deformation anomaly on the laser strainmeter data. The deformation method for determining the degree of tsunamigenic of underwater earthquakes is a good addition to the already existing methods for registering near-range tsunamis.

+ Author Biographies

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APPLICATION OF THE DEFORMATION METHOD IN THE ANALYSIS OF TSUNAMIGENIC EARTHQUAKES

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