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—The M W = 6.7, M L = 6.9 Khuvsgul (Khubsugul, Khövsgöl) earthquake occurred on January 12, 2021 in the Northern Mongolia close to the border of Russia. The earthquake caused ground shaking which reached intensity IX at the epicenter and was perceptible in the cities and villages of the Eastern and Western Siberia. The earthquake occurred in the re...
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... representation of the evolution of the aftershock process over time which does not take into account the linear dimensions of the activated region is shown in Fig. 5. The diagram in the magnitudetime coordinates reflects all the earthquakes from the smaller box in Fig. ...
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... rate of aftershocks (the number of aftershocks per unit time) and the number of the earthquakes with maximum energies indicate that the aftershock process slowly decays with time. We have fully processed the aftershocks for January and February 2021; however, as can be seen in Fig. 5, practically no earthquakes with magnitudes below 1-1.5 are present in the aftershock ...
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... Less than three months later, on December 9, 2020, the Kudara earthquake (M w = 5.5), comparable in magnitude and area of perceptibility zone, occurred near the Selenga River delta Radziminovich et al., 2022). Finally, on January 11, 2021, the Khövsgöl earthquake (M w = 6.8) (Liu et al., 2021;Emanov et al., 2022)-the strongest in over 60 years in the southern Baikal region-was registered in the water area of Khövsgöl Lake. All three earthquakes caused shaking intensity VI-VII MSK-64 in settlements located within near-field and were accompanied by damage to buildings, while a shaking intensity V and higher was recorded in many remote settlements, including large cities. ...
Представлена информация о сейсмичности Земли на уровне mb≥6.0 во II полуго- дии 2023 г., а также о 65 ощущавшихся на территории Российской Федерации землетрясениях по данным Службы срочных донесений ФИЦ ЕГС РАН. Для 20 наиболее сильных событий в течение одного-двух дней после их реализации были опубликованы Информационные сообще- ния, рассчитаны и приведены параметры механизмов очагов. За рассматриваемый период силь- нейшее землетрясение на земном шаре с MSP=7.6 (Mw=7.6) произошло 2 декабря на восточ- ном побережье острова Минданао, Филиппины. Самые большие человеческие жертвы и мате- риальный ущерб принесло катастрофическое землетрясение с MS=6.9 (Mw=6.9), произошедшее 8 сентября в Марокко. В результате этого землетрясения 2946 человек погибли, ещё 5530 чело- век были ранены. На территории России самым сильным стало землетрясение 28 декабря с MS=6.5 (Mw=6.5) в Тихом океане к востоку от Курильских островов. С наибольшей интенсив- ностью сотрясений (6 баллов) в населённых пунктах России ощущалось землетрясение 27 ноя- бря с mb=4.7, произошедшее на территории Новосибирской области. Выделенная на земном шаре во II полугодии 2023 г. сейсмическая энергия (SE0.5=7.47·1016 Дж) понизилась по сравнению с таковой в I полугодии и оставалась ниже среднего полугодового значения за период 2010–2023 гг. (ΣE0.5 =2.24·1017 Дж).
Using a mathematical statistics approach, we review the procedure for type classification of acoustic emission (AE) events into shear, tension, and collapse, proposed by Zang et al. (1998). The procedure is based on counting the signs of first pulses of waves arriving at acoustic sensors and is widely used in rock physics experiments. Under the assumption that the determination errors of first-pulse signs at sensors have uniform and independent distribution, the statistical significance and power of the type separation test are evaluated for a given number of sensors used. We consider and compare three methods of the construction of a statistical test based on the P-value approach and symmetric and asymmetric statistical hypothesis tests. Considering the results of the statistical study, we propose some practical recommendations for selecting a threshold to classify AE event types in experimental studies.
Information is provided on the seismicity of the Earth at the level of mb≥6.0 in the 2023 first half, as well as on 97 earthquakes felt on the territory of the Russian Federation according to the to the Alert Service of the Geophysical Survey RAS. For the 14 most severe earthquakes, information messages were publishing within one or two days after their implementation, the parameters of the mechanisms of foci were calculated and given. During the period under review, the strongest earthquakes on the globe with MS=8.0 (Mw=7.8) and MS=7.8 (Mw=7.7) occurred on February 6 in Kahramanmaras Province, Turkey. As a result of these earthquakes, 500 people were killed in Turkey, about 115 thousand were injured, about 10 thousand people were killed in Syria, and more than 10 thousand were injured. On the territory of Russia, the strongest earthquake was on April 3 with mb=6.4 (Mw=6.5) on the east coast of Kamchatka. It was also felt with the greatest intensity of concussions (5-6 points) in the settlements of Russia. The seismic energy released on the globe for the 2023 first half (1.93⋅1017 J) increased relative to similar values for the 2022 first and second half, coming close to the average half-year value for the period 2010-2022 (2.31⋅1017 J).
Throughout the history of the Baikal seismic network (since 1901), great efforts have been made to preserve the most detailed information about recorded seismic events. The article considers a method for detailed summary processing of earthquakes in the Baikal and Transbaikalia regions used in the BB GS RAS. The level and quality of regional processing are shown on the example of 2019. 7273 earthquakes were registered during the year, most of them are (62%) weak earthquakes (KР=6), for which the error of determining the coordinates of the epicenters was on average less than 5 km. Localization accuracy of epicenters for earthquakes with a KР≥9 is less than 2 km. The results of some studies using data from the Kultuk and Muyakan local temporary networks are presented. A comparison of the results and volumes of earthquake processing with other branches of the GS RAS is shown. Thus, the number of earthquakes in the region of the Baikal and Transbaikalia (N=63081) exceeds any of the other seismically active regions of Russia by at least 2.4 times for the period 2014–2017 (Altai and Sayan – N=26458; Kamchatka and Commander Islands – N=26301). According to the number of seismic stations which are used in the processing of one earthquake (K≥9) and the number of phases of seismic waves, regions of the Baikal, Transbaikalia and of the North Caucasus are leading and close to each other. There are 29 and 33 stations respectively, 87 and 68 phases. In other words, the volume of earthquake processing in the Baikal branch is much larger than in any of the branches of the GS RAS. It was concluded that currently the processing of earthquakes in the BB GS RAS is carried out in an optimal way in view to the size of the region, the number of seismic stations, the quality of communication and the number of recorded earthquakes. Reforming the system of processing seismic events in the BB GS RAS is expedient after a significant increase in the observation points in the region.
The geological effects of the Khubsugul earthquake of January 12, 2021, with Mw = 6.7, which
became the strongest in the Khubsugul region during the instrumental stage of seismological observations,
are studied and mapped. Using the ESI-2007 scale, the epicentral zone with intensity VIII is contoured. The
primary seismic rupture is represented by the right-lateral strike–slip with a displacement amplitude up to
20 cm, which renewed the Late Holocene tectonic scarp on the western side of the Khubsugul rift basin. The
dynamics of rupturing in the Late Holocene indicates the gradual expansion of the basin due to the destruction
of the adjacent mountain range. The data of satellite interferometry and seismological observations are
in good agreement with the results of the field studies, which allows considering the delineated region of maximum
shaking as a projection of the upper part of the source zone onto the surface.
Using a mathematical statistics approach, we review the procedure for type classification of acoustic
emission (AE) events into shear, tension, and collapse, proposed by Zang et al. (1998). The procedure is
based on counting the signs of first pulses of waves arriving at acoustic sensors and is widely used in rock physics
experiments. Under the assumption that the determination errors of first-pulse signs at sensors have uniform
and independent distribution , the statistical significance and power of the type separation test are evaluated
for a given number of sensors used. We consider and compare three methods of the construction of a
statistical test based on the P-value approach and symmetric and asymmetric statistical hypothesis tests.
Considering the results of the statistical study, we propose some practical recommendations for selecting a
threshold to classify AE event types in experimental studies.
Information is provided on the seismicity of the Earth at the level of mb≥6.0 in the 2022 second half, as well as on 66 earthquakes felt on the territory of the Russian Federation according to the to the Alert Service of the Geophysical Survey RAS. For the 15 most severe earthquakes, information messages were published within one or two days after their implementation, the parameters of the mechanisms of foci were calculated and given. During the period under review, the strongest earthquake on the globe with MS=7.8 (Mw=7.7) occurred on September 19 in the state of Michoacan, Mexico. The greatest human casualties and material damage were caused by a catastrophic earthquake with MS=5.3 (Mw=5.6), which occurred on November 21 on the island of Java, Indonesia. Because of the earthquake, 318 people were killing and more than 7,700 people were injured. On the territory of Russia, the strongest earthquake was on September 20 with MS=6.0 (Mw=6.1) in the area of the Commander Islands. The earthquake of December 8 with mb=5.6 (Mw=5.5), which occurred on the territory of the Republic of Dagestan, was felt with the greatest intensity of concussions (6 points) in the settlements of Russia. The seismic energy released on the globe for the 2022 second half (9.1⋅1016 J) increased after its minimum over the past 13 years (2010–2022), observed in the 2022 first half (2.76⋅1016 J), however, remained below the average value for 2010–2022 (2.31⋅1017 J).
