Pacific tsunamigenic earthquakes of early 2024

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Abstract

Using the example of two tsunamigenic earthquakes, a method for determining the magnitude of the displacement of the seabed, which is the cause of the tsunami, is being worked out. It is shown that with an average coefficient of divergence of deformation anomalies recorded by a laser strainmeter for the entire planet, it is possible to approximately estimate the amount of displacement of the seabed at the site of tsunami formation. For each region where the tsunami originated, there are more accurate divergence coefficients that can be estimated experimentally and from which the values of seabed displacements can be more accurately determined.

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About the authors

G. I. Dolgikh

Il'ichev Pacific Oceanological Institute FEB RAS

Author for correspondence.
Email: dolgikh@poi.dvo.ru
Russian Federation, Baltiyskaya str., 43, Vladivostok, 690041

S. G. Dolgikh

Il'ichev Pacific Oceanological Institute FEB RAS

Email: sdolgikh@poi.dvo.ru
Russian Federation, Baltiyskaya str., 43, Vladivostok, 690041

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Horizontal laser strainmeter with a measuring arm length of 52.5 m. a – central interference unit of the laser strainmeter; b – underground pipeline with a vacuum pipe.

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3. Fig. 2. Earthquake in the Sea of ​​Japan on 01.01.2024

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4. Fig. 3. Earthquake in the Sea of ​​Japan on January 1, 2024, as recorded by a laser strainmeter and a broadband seismometer (UTC time). a ‒ fragment of a laser strainmeter recording lasting 137 min, b ‒ enlarged fragment of the earthquake recording by a laser strainmeter, c ‒ fragment of a broadband seismometer recording.

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5. Fig. 4. Earthquake in Taiwan 02.04.2024

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6. Fig. 5. Taiwan earthquake as recorded by a laser strainmeter (UTC time). a — fragment of a 70-minute laser strainmeter recording, b — enlarged fragment of the earthquake recording, c — fragment of a broadband seismometer recording.

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