Vestnik of the Far East Branch of the Russian Academy of SciencesVestnik of the Far East Branch of the Russian Academy of SciencesВестник Дальневосточного отделения Российской академии наук0869-7698The Russian Academy of Sciences69877410.7868/S3034530825050088Earth and Environment SciencesНауки о Земле и окружающей средеResearch ArticleCalibration and testing of a new magnitude scale: the case study of a strong crustal earthquake on 01.01.2024 in Japan (Mw = 7,5)Калибровка и апробация новой магнитудной шкалы на примере сильного корового землетрясения 01.01.2024 в Японии (Mw = 7,5)https://orcid.org/0000-0003-2997-1524KonovalovA. VКоноваловА. В

Candidate of Sciences in Physics and Mathematics, Leading Researcher

кандидат физико-математических наук, ведущий научный сотрудник

a.konovalov@geophystech.ruOrlinI. DОрлинИ. Д

Engineer

инженер

office@geophystech.ruhttps://orcid.org/0000-0001-5263-5161StepnovaYu. AСтепноваЮ. А

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

кандидат геолого-минералогических наук, старший научный сотрудник

stepnova@fegi.ruFar East Geological Institute, FEB RASДальневосточный геологический институт ДВО РАН151120255NO5 (2025)№5 (2025)10411516122025Copyright ©; 2025, Russian Academy of SciencesCopyright ©; 2025, Российская академия наук2025Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0869-7698/article/view/698774

A crustal earthquake and its aftershocks that occurred in Japan (Mw = 7,5, 01.01.2024) were studied to make measurements and analyze the parameters of strong ground motion, including the Arias intensity. The latter is one of the key physical parameters used in engineering seismology. The level of the Arias intensity is directly connected with the stress drop in an earthquake source. Therefore, developing and calibrating a magnitude scale that would take into account not only fault dimensions, but also the stress drop in an earthquake source is a vital task of seismological observations. In this paper we present our test results of a new magnitude scale (MIa3) based on a modified Arias intensity. The scale was calibrated to medium and moderate earthquakes in the target area (M ~5). The high efficiency of the proposed scale is evidenced by the magnitudes, determined through the new method, that are almost consistent with the moment magnitude (Mw).

На примере корового землетрясения в Японии (Mw = 7,5, 01.01.2024) и его афтершоков проведены измерения и анализ параметров сильных движений грунта, в том числе интенсивности по Ариасу. Интенсивность Ариаса является одной из главных физических метрик, используемых в инженерной сейсмологии. Уровень интенсивности Ариаса непосредственно связан со сброшенным напряжением в очаге землетрясения, поэтому разработка и калибровка магнитудной шкалы, учитывающей не только размеры разрыва, но и сброшенное напряжение в очаге землетрясения, является актуальной задачей сейсмологических наблюдений. В настоящей работе апробирована новая магнитудная шкала (MIa3>), основанная на модифицированной интенсивности Ариаса. Калибровка шкалы выполнена по средним и умеренным землетрясениям в целевом регионе (M ~5). Высокую эффективность предложенной шкалы подтверждают оценки магнитуды, полученные по новой методике, которые близки к моментной магнитуде (Mw).

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