A regional surface wave magnitude scale for the earthquakes of Russia’s Far East


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The modified scale Ms(20R) is developed for the magnitude classification of the earthquakes of Russia’s Far East based on the surface wave amplitudes at regional distances. It extends the applicability of the classical Gutenberg scale Ms(20) towards small epicentral distances (0.7°–20°). The magnitude is determined from the amplitude of the signal that is preliminarily bandpassed to extract the components with periods close to 20 s. The amplitude is measured either for the surface waves or, at fairly short distances of 0.7°–3°, for the inseparable wave group of the surface and shear waves. The main difference of the Ms(20R) scale with the traditional Ms(BB) Soloviev–Vanek scale is its firm spectral anchoring. This approach practically eliminated the problem of the significant (up to–0.5) regional and station anomalies characteristic of the Ms(BB) scale in the conditions of the Far East. The absence of significant station and regional anomalies, as well as the strict spectral anchoring, make the Ms(20R) scale advantageous when used for prompt decision making in tsunami warnings for the coasts of Russia’s Far East.

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O. Chubarova

Institute of Volcanology and Seismology

编辑信件的主要联系方式.
Email: ochubarova@emsd.ru
俄罗斯联邦, bulv. Piip 9, Petropavlovsk-Kamchatskii, 683006

A. Gusev

Institute of Volcanology and Seismology; Kamchatka Branch, Geophysical Survey

Email: ochubarova@emsd.ru
俄罗斯联邦, bulv. Piip 9, Petropavlovsk-Kamchatskii, 683006; bulv. Piip 9, Petropavlovsk-Kamchatskii, 683006

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