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Оценка активности афтершокового процесса с помощью закона Гутенберга ‒ Рихтера и ETAS-модели

Оценка активности афтершокового процесса с помощью закона Гутенберга ‒ Рихтера и ETAS-модели

Abstract

В работе вводится авторское формализованное понятие активности афтершокового процесса, основанное на совместном использовании закона Гутенберга – Рихтера и ETAS-модели. Закон Гутенберга – Рихтера используется для характеристики сейсмического режима афтершокового процесса в некоторый момент времени, ETAS-модель – для оценки сейсмичности, не являющейся частью афтершокового процесса. Предложенный вариант активности имеет смысл вероятности того, что на некотором интервале времени произойдет сильное землетрясение, являющееся афтершоком, а не фоновым событием. В качестве примеров приводятся расчеты активности для трех афтершоковых процессов сильных землетрясений из районов с различным сейсмогенезом (Камчатка, Алтае-Саянская складчатая область и Северный Кавказ). Расчеты показали, что сильные афтершоки происходят либо во время спада активности (затишье), либо сразу после его окончания. Таким образом, фиксируемый методикой спад сейсмической активности может использоваться в работе центров сейсмического мониторинга после сильного землетрясения как предвестник сильных афтершоков.

In this paper the author introduces a formal definition of an aftershock process activity which is based on the joint use of Gutenberg – Richter law and ETAS-model. Gutenberg – Richter law is used for description of seismic regime of the aftershock process, ETAS model is used for estimating seismicity which is not a part of the aftershock process. The suggested activity is formulated in the terms of probability that at some time interval a strong earthquake which is a part of the aftershock process but not a background event would happen. Results of calculations of the activity for three aftershock processes due to strong earthquakes occurred in the areas with different types of seismicity (Kamchatka Peninsula, Altai – Sayan area and the North Caucasus) are provided as an example. The results show that strong aftershocks occur either during the period of a decay of the activity or just after the decay ending. Thus, the observed regularity can be used in the work of centers of seismic monitoring as a precursor of strong aftershocks.

Keywords

АФТЕРШОКИ, СЕЙСМИЧЕСКАЯ АКТИВНОСТЬ, СЕЙСМИЧЕСКОЕ ЗАТИШЬЕ, ПРЕДВЕСТНИК СИЛЬНЫХ СОБЫТИЙ, ЗАКОН ГУТЕНБЕРГА – РИХТЕРА, ETAS-МОДЕЛЬ, GUTENBERG – RICHTER LAW

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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