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Radziminovich Ya. B. Filippova A. I. Gileva N. A. Melnikova V. I. 《Izvestiya Atmospheric and Oceanic Physics》2022,58(8):936-953
Izvestiya, Atmospheric and Oceanic Physics - We study in detail the source parameters, seismotectonic position, and macroseismic effects of the February 3, 2016, earthquake that occurred in the... 相似文献
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V. I. Mel’nikova N. A. Gileva S. S. Aref’ev V. V. Bykova O. K. Masal’skii 《Izvestiya Physics of the Solid Earth》2012,48(7-8):594-614
The results of investigating the data of stationary and field observations in the epicentral zone of the Kultuk earthquake of August 27, 2008 with M w = 6.3 localized south of Baikal are presented. The seismic activation amounting to 1790 aftershocks with K p ?? 4 (M w ?? 0.9) affected a part of the general fault bounding the southwestern coast of the lake and shallower intrabasin structures. It was established through the cluster analysis that the main shock was located at the periphery of the cloud of the concentrated seismicity component, and three main clusters reflecting a complex character of rupture in the earthquake source were identified in the zone of aftershocks. Owing to a high accuracy of aftershock hypocenters determinations (ERZ ?? 1.2 km), the local character of the seismisity-generating zones was revealed. Based on the method of mapping seismic regime parameters, it was established that zones of reduced fractionality are recognizable in the central part of the source area; in this case, the entire periphery, except for the southeastern direction (where the main shock epicenter is located), is characterized by a high fractionality, which also points to the complex character of the rupture in the source. On the whole, the aftershock sequence under consideration showed the activation of the southwestern flank of the Southern Baikal region, which remained passive for more than one century, and demonstrated destructive features of the Earth??s crust. 相似文献
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V. I. Melnikova N. A. Gileva S. S. Arefyev V. V. Bykova A. I. Seredkina 《Izvestiya Physics of the Solid Earth》2013,49(4):563-576
We consider the results of reconstructing the stress-strain state of the Earth’s crust in South Baikal from the focal mechanism data for the Kultuk earthquake of August 27, 2008 (M w = 6.3) and its aftershocks. The source parameters of the main shock were determined by calculating the seismic moment tensor. The focal mechanism solutions of 32 aftershocks (M w ≥ 2.3) were obtained through the deployment of a local seismic network at South Baikal. It is found that the main shock and first aftershocks (August–September) gave rise to the activation of latitudinal fragments of the segmented near-edge fault, and the sources of the consequent aftershocks were dominated by the NW-striking planes related to the small intrabasin structures. The calculations of seismotectonic deformations based on the data on the focal mechanisms of the earthquakes show that the area of activation is dominated by the transtension regime (with deformation in the form of extension with shear). The epicentral and hypocentral fields of the aftershocks and the mechanisms of their sources reflect the complex tectonic structure of the source zone of the Kultuk earthquake, which exhibits a clear subvertical zonality of the local seismically active volume and a wedge-shaped area of crustal destruction. 相似文献
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Ya.B. Radziminovich V.I. Mel'nikova A.I. Seredkina N.A. Gileva N.A. Radziminovich A.A. Papkova 《Russian Geology and Geophysics》2012,53(10):1100-1110
The Balei earthquake of 6 January 2006 (Mw = 4.5) was felt over a large part of Transbaikalia. Judging by its updated source parameters (earthquake mechanism, seismic moment, and moment magnitude), the event was generated by the Balei–Darasun fault reactivated in the Cenozoic. Exhaustive macroseismic evidence has been collected for the first time from the study area. The reported results fill up the gap in the seismological knowledge of eastern Transbaikalia and can be used for seismic risk mapping and earthquake prediction. 相似文献
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The January 6, 2006, Balei earthquake as a reflection of the present tectonic activity of the east Trans-Baikal Region 总被引：1，自引：0，他引：1
Mel’nikova V. I. Radziminovich Ya. B. Gileva N. A. Radziminovich N. A. Papkova A. A. 《Doklady Earth Sciences》2011,437(2):552-556
The results of detailed studies of the January 6, 2006, Balei earthquake (K
p = 13.1, M
b = 4.7 [7]), which occurred in an almost aseismic area of the east Trans-Baikal Region, are presented. The focal mechanism
and dynamical characteristics of the focus are considered, and the structural-tectonic position of the focus is analyzed.
It is supposed that the focus of this seismic event coincides with an activated segment of the northwest-striking Balei-Darasun
fault. The maximal observed macroseismic intensity was 5–6 points by the MSK-64 scale (in the town of Baleis). The origination
of foci for the earthquake with such intensity and magnitude takes place substantially owing to subhorizontal northeastern
compression, the varied-rank block structure of the medium, and low rate values of tectonic motions; on aggregate, all these
factors promote the accumulation of stresses in the Earth’s crust. The obtained data can be useful for the purpose of assessment
in seismic danger of the region. 相似文献
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V. I. Mel’nikova N. A. Gileva V. S. Imaev Ya. B. Radziminovich Ts. A. Tubanov 《Doklady Earth Sciences》2013,453(2):1282-1287
Scenarios for developing focal zones of strong (M w = 5.3) earthquakes that occurred in the Middle Baikal region in 2008 and 2011 are considered. The new (submeridional and sublatitudinal) lines of destruction of the Earth’s crust in the water area of the lake are recorded. The facts of seismoactive structures forming in the surrounding mountains (to the southeast) under typical rift conditions of movements are established, which indicates that the basin of Lake Baikal is expanding and growing due to active capturing and processing of its mountain surroundings. 相似文献
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Alena I. Seredkina Valentina I. Melnikova Nadezhda A. Gileva Yan B. Radziminovich 《Journal of Seismology》2015,19(3):685-694
We described the 2014 January 17 earthquake (M w?=?4.3) occurred on the Siberian platform in the area of sublongitudinal part of the Angara river in the zone of possible influence of two large reservoirs—Ust-Ilimsk and Boguchan. This is the first event of such magnitude recorded in this previously aseismic area during the whole period of instrumental observations. A seismic moment, a moment magnitude, a hypocentral depth, and a focal mechanism of the event were calculated on the basis of surface wave amplitude spectra. Analysis of the geological and geophysical data showed that the earthquake origin is connected with high-velocity gradient zone located at the border of the Late Proterozoic cover and the Precambrian basement of the Siberian platform. Some evidences for a natural character of the earthquake were considered. 相似文献
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V. I. Mel’nikova N. A. Gileva N. A. Radziminovich O. K. Masal’skii V. V. Chechel’nitskii 《Seismic Instruments》2010,46(2):193-206
Some characteristics of the seismic regime of the Baikal rift zone for the analogue (1960–2000) and digital (2001–2006) registration
modes are considered. It was ascertained that the general number of seismic events recorded by digital equipment increased
by two times in comparison with the analogue observation period and the catalog completeness level was lowered to K
P = 7.0 as well. The focal mechanisms of 110 earth-quakes with K
P ≥ 8.0 were examined. The overwhelming majority of them during 2001–2006 were due to normal faulting and normal faulting with
strike-slip components. Special attention was given to study of the strong events (K
P ≥ 13.5 and MPSP ≥ 4.7), whose focal solutions reveal the regional stress field. 相似文献
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V. I. Melnikova N. A. Radziminovich N. A. Gileva A. V. Chipizubov A. A. Dobrynina 《Izvestiya Physics of the Solid Earth》2007,43(11):905-921
The paper addresses the spatiotemporal development of the Kichera sequence of earthquakes of 1999 (more than 6000 events over the year) within the Kichera depression, terminating on land in the Northern Baikal basin; the series was the most intense of all earthquake sequences recorded in the Northern Cis-Baikal region (NCBR) since 1960. The spatial coordinates of earthquakes showed that the source rupture, originating in the area of the Kichera-Upper Angara interbasin mountainous isthmus, propagated in the SW direction toward Lake Baikal. Stresses in the sources of the two strongest shocks (Mw = 6.0 and 5.6) of the sequence were released along fault planes striking NE (normal type) and E-W (normal-strike-slip type). Focal mechanisms of aftershocks revealed the presence of differently oriented faults motions on which were controlled by a large rifting fault striking NE. The Kichera earthquakes are shown to have occurred under seismotectonic conditions dominated by NW-SE extension and to have been accompanied by active normal faulting promoting longitudinal growth of the Upper Angara depression and deepening of the Kichera depression. The seismotectonic strain rates calculated for the NCBR before and after 1999 were of the order of (0.1–1.0) × 10?10 yr?1, whereas their values were two to three orders larger during 1999. Thus, the Kichera earthquakes confirmed the high seismic potential of the NCBR and showed that this rift segment developed through growth of depressions and destruction of interbasin mountainous isthmuses. 相似文献
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