The article presents the results of FCAZ-recognition of the strongest (≥ 7.75) earthquakeprone areas on the Pacific coast of the Kamchatka Peninsula and strong (≥ 6.5) earthquakeprone areas in California. For the first time, earthquake epicenters from declustered catalogs were used as recognition objects. Based on the example of the considered regions it is shown that the presence of foreshock and aftershock sequences in the earthquake catalogs does not significantly affect the results of FCAZ-recognition based on the clustering study of weak earthquake epicenters.
The annual review of seismicity in the territory of Belarus based on the data of two analog and eighteen digital stations is presented. Forty three events with Кd=4.6-8.2 were recorded. These were attributed to the southern part of the territory, which includes the Soligorsk mining area. The map of epicenters of all the events and the table showing their distribution by months are presented. The N(K) function for 2013 was compared with those for 1983-2012. The amount of seismic energy released in 2013 is 1.89 times higher than in 2012 and 5.13 times lower than its average value for previous 30 years. The distribution of the events according to their energy classes and total seismic energy by months in 2013 as well as for the period of 31 years since 1983 till 2013 was provided. The time history, time of day and day of week distributions of seismicity recorded in 2013 are presented.
Data on the earthquakes recorded in the Soligorsk mining area during the years 1983–2017 were used to investigate their distribution features both in the energy, and space-time characteristics. Based on the sketch maps of the epicenters and the graphs of the accumulated numerical values of the earthquakes the periods and areas of the repre sentative earthquakes were determined for each energy class К = 5, 6, 7, 8. A normalized graph of the earthquake recurrence was created.
Аннотация. Контроль состояния геологической среды-это одна из наиболее важных задач сейсмологического мониторинга территории Беларуси. Сейсмологический мониторинг в Беларуси представляет собой систему непрерывных круглосуточных наблюдений за происходящими сейсмическими событиями естественного и искусственного происхождения в широком диапазоне энергий и расстояний с использованием автоматизированных систем. Основная задача сети сейсмических наблюдений на территории Беларуси заключается в регистрации далёких, региональных и местных сейсмических событий. За период с 1966 г. по настоящее время сетью сейсмических станций, расположенных на территории Беларуси, зарегистрировано 60827 землетрясений в разных регионах Земли. Выполнен анализ полученных сведений о сильных далёких, региональных и местных землетрясениях, зарегистрированных сейсмическими станциями. Проведён расчёт интенсивности сейсмических воздействий этих землетрясений на изучаемой территории с использованием формулы Н.В. Шебалина. Исследования позволили оценить уровень сейсмических воздействий на территорию Беларуси. Наибольшее влияние на исследуемую территорию среди сильных землетрясений Земли оказало катастрофическое землетрясение, произошедшее 26 декабря 2004 г. на западном побережье Северной Суматры. Из сильных землетрясений Европы и смежных территорий наибольшее воздействие оказали два землетрясения-8 января 2006 г. в Южной Греции и 23 октября 2011 г. в Турции. Из региональных землетрясений наибольшее воздействие оказало землетрясение, произошедшее 23 сентября 2016 г. в Румынии. Количественная оценка сотрясаемости от землетрясений разной удалённости на территории Беларуси находит своё практическое применение для совершенствования карт общего и детального сейсмического районирования, решения других научных и практических задач.
. The review of annual seismicity in the territory of Belarus based on the data of two analog and seventeen digital stations is presented. 57 events with Кd=4.6–8.8 are recorded, all of them are located in the southern part of the territory, including the Soligorsk mining area. The maximum seismic energy released in March, August, October and November. The maximum number of earthquakes was observed from July to August and from October to November. The N(K) andΣE functions in 2014 were compared with those within 1983–2013. The number of events in 2014 is 1.34 times more than its average value for previous 31 years. The level of the seismic energy released in 2014 is 2.43 times more than in 2013 and 2.05 times lower than its long-time average value. The distributionof earthquakes by depth intervals showed that the earthquake foci are mostly located in the upper 20 km part of the Earth’s crust. However, the foci of 47 earthquakes are located at depths below 10 km. A slope of the graph showing the recurrence of the events with representative energy classes Кd=6–8 in 2014 was calculated. Its modulus γ=|0.48| is lower than the value γ=|0.5| in 2013. The distribution of all the events in 2014 is represented in real time. Quiet seismic periods and seismic activation periods were determined. The distribution of the seismic events by the hourly intervals showed the periods of the daytime and nighttime increase of the seismic event number. The maximum and minimum values N in the seismic event distribution by the days of the week were determined. The seismicity analysis has shown that the seismic activity level in 2014 was higher than that in 2013, but lower than its long-time average value.
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