Zones of catastrophic earthquakes of Central Asia: Geodynamics and seismic energy

Gatinsky, Yu. G.; Прохорова, Т. В.; Rundquist, D. V.; Vladova, G. L.

doi:10.2205/2009es000326

Cited by 10 publications

(23 citation statements)

References 16 publications

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“…2) is characterized by intensive seismicity in the Late Holocene and the current time. It coincides mainly with the block boundaries and interblock zones within the Central Asian and East Asian transitional zones discussed in detail in [Gatinsky et al, 2009[Gatinsky et al, , 2011.…”

Section: Adjacent Blockssupporting

confidence: 67%

“…Transpressive tensions predominate in the western Tunka Trough, wherein left-lateral strike-slips are developed [Gatinsky et al, 2009;San'kov et al, 2014]. It should be noted that strike-slips are replaced in the east by later normal faults in the flanks of the Barguzin depression being a part of the Baikal Rift Sys-tem east of Lake Baikal.…”

Section: Adjacent Blocksmentioning

confidence: 99%

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The 102–103° E geodivider in the modern lithosphere structure of Сentral Asia

Гатинский

Прохорова

Рундквист

2018

Geodin. tektonofiz.

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A quasi-linear zone of noticeable geological and geophysical changes, which coincides approximately with 102–103° E meridians, is termed by the authors as “geodivider”. Active submeridional faults are observed predominantly along the zone and coincide with its strike. Seismicity is most intensive in the central part of this zone, from the Lake Baikal to the Three Rivers Region at the Sino-Myanmar frontier. Transects with deep seismic sections and energy dissipation graphs show most sharply increasing seismic energy amounts and hypocenter depths in the western part of the geodivider which delimits (in the first approximation) the Central Asian and East Asian transitional zones between the North Eurasian, Indian and Pacific lithosphere plates. The transpression tectonic regime dominates west of the geodivider under the influence of the Hindustan Indentor pressure, and the transtension regime prevails east of it due to the Pacific subduction slab submergence and continuation. The regime change coincides with an abrupt increase in the crust thickness – from 35–40 km to 45–70 km – west of the geodivider, as reflected in the geophysical fields and metallogenic characteristics of the crust. The direction ofP- andS-waves anisotropy together with the GPS data show decoupling layers of the crust and mantle in the southern part of the geodivider. According to our investigations, the 102–103° E geodivider is a regional geological-geophysical border that may be compared with the Tornquist Line, and, by its scale, with the Uralian and Appalachian fronts and some others large structures.

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Section: Adjacent Blockssupporting

confidence: 67%

Section: Adjacent Blocksmentioning

confidence: 99%

The 102–103° E geodivider in the modern lithosphere structure of Сentral Asia

Гатинский

Прохорова

Рундквист

2018

Geodin. tektonofiz.

Self Cite

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“…It is supposed by S-waves velocities distribution and recent plume-connected volcanism development [26,39]. Projections of these velocities decreasing coincide with maximal heat flow anomalies and most intensive earthquakes distribution.…”

Section: Interblock Zonesmentioning

confidence: 99%

“…A transtension tectonic regime predominates here with development of numerous rifts in the Baikal System, around the Ordos Block, inside the JapaneseKorean and SE China blocks. Such sharp change of vectors direction has different explanations: squeezing out some blocks including Amurian one to the east under influence of the collision process [25], rising of mantle plumes underneath north Mongolia and the Lake Baikal [26], a gravitational rolling down of crust layers from the highly emerged Tibet Plateau [27].…”

Section: Block Kinematicsmentioning

confidence: 99%

Up-To-Date Geodynamics and Seismicity of Central Asia

Gatinsky¹,

Rundquist²,

Vladova³

et al. 2011

IJG

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The analysis of the seismicity in central Asia shows its distribution within a "triangle" of maximal inner-continental seismic activity, which is situated between south edge of the Lake Baikal and the Himalayas. The "triangle" coincides with the central Asian transit zone which divides the north Eurasian and Indian lithosphere plates and provides transfer and relaxation of tectonic stresses that arise between them. The central Asian transit zone consists of numerous crust blocks of different sizes. Blocks' boundaries are often represented by not only single faults but relatively wide interblock zones characterized by intensive shattering of rocks and releasing a significant quantity of the seismic energy. The most active interblock zones limited the Pamirs, Tien Shan, Shan, and Bayanhar blocks as well as north boundaries of the Indian Plate. The quantity of the seismic energy releasing along each of them reaches ≥ 5 × 10 15 J, while along other boundaries it doesn't exceed 3 × 10 12 -2 × 10 15 J. The majority of the most intensive seismic events took place just in these interblock zones. The total quantity of seismic energy is generally diminished away from the boundary of the Indian Plate, but sometimes the maximal quantity releases in inner parts of the transit zone at the distance 500-1500 km from the plate boundary. The most active interblock zones of central Asia differ from subduction and collision zones by depth of their penetration in lithosphere and at the same time are rather near to them by the volume of energy realizing. The examination of interblock zones shows that the majority of intensives earthquakes occur within them in regions with sharp changes of geodynamic conditions. On the whole the most part of central Asia is situated under the influence of the Indian indenter, which causes the prevailing of transpression tectonics. An abnormal high seismic energy releasing depends of deep continuation of the plate slab in collision zones (Pamirs, Himalayas), intensive displacements along strike-slips and thrusts due to collision processes and deep lithosphere unhomogeneity (Tien Shan, Bayanhar), as well as of sharp changes of geodynamic conditions because of influence of plate movement and supposed mantle plumes (north Mongolia, the Baikal region).

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“…5) It is reasonably during projecting new electric stations to avoid areas within interblock zones in the transit zones, in which as a rule the maximal seismic energy releases. Methods of such interblock zones establishing and the calculation energy in them are done in the work [9].…”

Section: Discussionmentioning

confidence: 99%

Seismic-Geodynamic Monitoring of Main Electric Power-Stations in East Europe and North Asia

Gatinsky¹,

Rundquist²,

Vladova³

et al. 2011

IJG

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In east Europe and north Asia the majority of nuclear power-stations (NPS) as well as large hydro-electric (HES) and thermal electric stations (TES) are located within the north Eurasian lithosphere plate, which is characterized by the low seismicity and weak modern tectonic activity besides the different exogenetic processes. Some operating and projected NPS are relatively near to zones of the moderate seismicity in the Kaliningrad Region of northwest Russia and in south Ukraine. HES and TES in Baltic, Byelorussia and Ukraine are in the same position. Zones of more intensive seismicity and existence of active faults include NPS, HEP and TEP in the Urals, the Kola Peninsula, south Siberia, Transbaikal and Far East regions of Russia. Some of these stations are situated within crust blocks in transit zones, which separate main lithosphere plates and are characterized by increased tectonic mobility. The electric power-stations are most danger in the transit zones between north Eurasian, Arabian and Indian lithosphere plates, where collision processes have yet not stopped. This concerns electric stations in central Asia and Caucasus including NPS in Armenia. Seven schemes of the seismic energy distribution are composed for different parts of east Europe and north Asia. The location of nuclear and main other electric power-stations on them makes it possible to form a correct estimate of negative consequences connected with the up-to-date inner-continental tectonic activity

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Zones of catastrophic earthquakes of Central Asia: Geodynamics and seismic energy

Cited by 10 publications

References 16 publications

The 102–103° E geodivider in the modern lithosphere structure of Сentral Asia

The 102–103° E geodivider in the modern lithosphere structure of Сentral Asia

Up-To-Date Geodynamics and Seismicity of Central Asia

Seismic-Geodynamic Monitoring of Main Electric Power-Stations in East Europe and North Asia

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