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Ring-shaped seismicity structures in two subduction zones of the Pacific: possible preparation for large earthquakes

Authors: Копничев Ю.Ф., Соколова И.Н.

Keywords: характеристики сейсмичности в зонах субдукции, Новая Зеландия, Центральная Америка

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We have been studying some seismicity characteristics in two subduction zones: in the regions of New Zealand (North island, between 42° and 38.5° S) and Central America (El Salvador and Guatemala, between 12° and 14.5° N). It was shown that ring-shaped seismicity structures are being formed after 1973 in two depth ranges: 0-33 and 34-70 km in both zones, like in many other regions. We have obtained estimates of threshold magnitude values (Mt1 and Mt2 in the ranges mentioned respectively), and also dimensions of ring structures (L and l) for these zones. Earlier correlation dependences of these parameters on magnitudes Mw of main events for the west and east of the Pacific were constructed. Using these dependences we estimated magnitudes of possible large earthquakes: Mw=8.4±0.2 and 8.0±0.3 for the regions of New Zealand and Central America correspondingly.

Ring-shaped seismicity structures in the Cascadia subduction zone: possible preparation for large earthquakes

Authors: Копничев Ю.Ф., Соколова И.Н.

Keywords: характеристики сейсмичности в зоне субдукции Каскадия, Северная Америка

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We have been considering seismicity characteristics in the Cascadia subduction zone, located in the west of North America. It was established, that since 1964 shallow (h=0–33 km) ring-shaped seismicity structures with threshold magnitudes Mt1 of 4.3 and 4.8 respectively have been formed prior to two large earthquakes (17.08.1991, Mw=7.1 and 25.04.1992, Mw=7.2). At the same time deep ring-shaped structures (h=34–70 km) were not observed here, in contrast to many other subduction zones. We have been identified three new ring-shaped structures with values Mt1varying from 4.7 to 5.2, which began to form since 1973. It is supposed that large earthquakes can be prepared in these areas. At the base of correlation dependences of ring sizes and Mt values on magnitudes of major events, obtained earlier for the east of Pacific, we estimated magnitudes for possible large earthquakes: Mw=7.6–7.9 (the largest value – for the Vancouver island area). It follows from this data that the giant earthquake with Mw~9, analog of the 1700 event is not being prepared now in the subduction zone. At the same time a realization of large earthquake (Mw=7.9±0.3) is most probable in the area of Vancouver island in the nearest years. We discuss the reasons for the deep rings absence in the Cascadia subduction zone.

Computation of the ampule lid of IGR reactor’s loop channel

Authors: Сулейменов Н.А., Котов В.М., Витюк Г.А.

Keywords: экспериментальное устройство (ЭУ), крышка ампулы петлевого канала ИГР, проблемы при организации связи элементов внешнего натриевого контура

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The paper addresses the problems occurred during organization the element connection of outer sodium loop with experimental device through the ampule lid of IGR reactor loop channel and engineering solutions to overcome these problems. In particular, it is suggested the engineering solution to avoid anchoring elements overheating of the ampule lid and to ensure safe operating parameters of experimental device. 

Influence of plasma on tungsten and molibdenum as candidate materials for fusion reactor

Authors: Скаков М.К., Соколов И.А., Туленбергенов Т.Р., Рахадилов Б.К.

Keywords: термоядерные реакторы, вольфрам, молибден, характеристики плазменно-пучкового разряда в среде водорода

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The paper presents the results of experimental studies of helium, deuterium and hydrogen plasma interaction with candidate materials of thermonuclear reactor’s diverter in simulation test bench with plasma beam installation. The characteristics of beam-plasma discharge in hydrogen are studied, wherein the modes of plasma impact in plasma beam installation provide more approximate characteristics of Tokamak’s plasma. To study the structure and to determine tungsten and molybdenum samples ultimate composition and their physical mechanical properties and also in order to study the fracture mode of irradiated layer materials the following methods were used: X-ray phase analysis, transmission electron microscopy, scanning electron microscopy and emission spectroscopy. 

Computation of burden inductive heating in the electric melting furnace of LAVA-B facility

Authors: Акаев А.С., Хажидинов А.С., Гановичев Д.А.

Keywords: ЛАВА-Б, жаростойкие материалы, электроплавильная печь (ЭПП), нагрев и плавление шихты

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The idea beyond of this work is to develop and validate conjugated thermophysical model of burden heating and melting in the electric melting furnace (EMF) of LAVA-B facility. The use of thermophysical computational model of the EMF makes possible to develop the diagram of burden heating and melting in EMF before the experiment on study of melt interaction with candidate heat-resisting material, which can be used in the systems of the nuclear reactor core melted fuel location in the case of severe accident. The use of burden heating and melting diagram in the EMF enhances the possibility to carry out expensive experiment successfully.

The origin and consequences of the largest Hindu Kush earthquake of october 26, 2015 (Mw=7.5)

Authors: Соколов А.Н., Мусрепов А.В.

Keywords: землетрясение, Гиндукуш

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On October 26, 2015 there was a catastrophic earthquake Mw=7.5 at Hindu Kush region. The slip history was complex, it revealed two consecutive shocks with a difference of ~ 10 seconds of the first M = 5.9, the second was characterized by a maximum of released seismic energy with Mw = 7.5. The waveform peculiarities using data IGR RK seismic network studied. Earthquake parameters were compared with the results of the processing of International and regional seismological centers. The work considers seismicity characteristics of Hindu Kush area by data of global seismic stations networks since 1973. The regularities of aftershock activity investigated. The records of strong motion by data of Kazakhstan and Central Asia stations analyzed.

Seismic stations effectiveness in earthquake monitoring of Central Asia territory

Authors: Михайлова Н.Н., Рябенко П.В.

Keywords: Казахстанский национальный центр данных (КНЦД), бюллетени сейсмических событий

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Kazakhstan Data Centre compiles several types of seismic bulletins. The contribution of RSE IGR and SEME MES RK stations into the joint operative bulletin is assessed. The most effective are seismic arrays Makanchi and Karatayu located in seismically active regions of Kazakhstan. For the West Kazakhstan, the significant role of Akbulak station (seismic array) and Aktyubinsk station is noted as the stations contribute much into the monitoring of induced events at oil and gas field deposits.

Change in seismotectonic conditions in the area of platform research nuclear reactor VVR-K INP the study of focal mechanisms recent years

Authors: Полешко Н.Н., Узбеков А.Н.

Keywords: ИЯФ, ВВР-К, результаты исследования сейсмотектонической деформации

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The results of the study seismotectonic deformation in the vicinity of the site of placement of the nuclear reactor VVRK INP near Almaty. One of the most important ways of getting information about the stress-strain state of deep parts of the Earth's crust is the study of focal mechanisms. According to the results of monitoring of seismicity in 2015 the catalog of focal mechanisms, comprising more than 250 earthquakes studied parameters earthquake focal mechanisms are constructed, a map of the types of movements of earthquakes. The conclusions about the seismic situation in the area of reactor VVR-K INP.

Nuclear test in North Korea 2016

Authors: Сейнасинов Н.А., Узбеков Р.Б.

Keywords: Ядерные испытания, Северная Корея

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Monitoring of the Nuclear Tests is one of the main objectives of the seismic and infrasound stations of IGR RK. These stations had successfully registered all 4 North Korean nuclear tests (10.9.2006, 05.25.2009, 02.12.2013 и 01.06.2016). The epicentral distances from the North Korean test site Punggye-ri are in the range of 3725–5375 km. Kazakh National Center succeeded in determining the parameters of these explosions with sufficient accuracy. To improve the results, the explosion conducted on January 6, 2016 is relocated after introducing azimuthal corrections for the Akbulak , Kurchatov and Makanchi seismic arrays. As a result of the parameters correction the coordinates of the explosion epicenter became considerably closer to the solutions of the International Data Centers as well as to the original location of the tunnel. A comparative analysis of the kinematic and dynamic parameters is conducted for 4 tests using the data from Kazakh seismic stations.

Instrumental precision of peaceful nuclear explosions conducting sites on the territory of Kazakhstan

Authors: Абишев А.Х., Яковенко А.М., Маккей К.Г.

Keywords: мирные ядерные взрывы, определение эпицентров сейсмических событий (землетрясений либо взрывов)

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Correct and accurate determination of seismic events (earthquakes or explosions) epicenters is important for seismic and nuclear monitoring. The results of instrumental determination of peaceful nuclear explosions (PNE) location sites conducted in the Soviet time are described. This allowed reviewing the data published before and suggesting its application for development of discrimination techniques for events of different nature (nuclear explosions, industrial blasts, earthquakes).