Activation of seismicity in Central and South Asia after the Makran earthquakes: Possible acceleration of preparation of large seismic events in the Tien Shan region

2017 ◽  
Vol 53 (3) ◽  
pp. 234-243
Author(s):  
Yu. F. Kopnichev ◽  
I. N. Sokolova
Keyword(s):  
South Asia ◽  
Tien Shan ◽  
Seismic Events

scholarly journals Disjunctive dislocations of the upper crust of Tien Shan

2019 ◽  
Vol 484 (3) ◽  
pp. 316-319
Author(s):  
V. S. Burtman
Keyword(s):  
Active Faults ◽  
Tien Shan ◽  
Late Paleozoic ◽  
Seismic Events ◽  
Upper Crust ◽  
No Formation ◽  
The Rose

This paper analyzes the rose diagrams of the directions of 439 faults of the Variscian province, 476 faults of the Caledonian province, and 603 presently active faults of Tien Shan. It is shown that more than half of the faults of the Caledonian province of Tien Shan are a result of Late Paleozoic orogenesis, which spanned its entire territory. Our data indicate that seismic events of Tien Shan have resulted in no formation of new disjunctive dislocation in many cases exhibiting displacements along Paleozoic faults.

scholarly journals KAZAKHSTAN

2019 ◽  
pp. 131-138 ◽  
Author(s):  
N. Neverova ◽  
N. Mikhailova ◽  
Inna Sokolova
Keyword(s):  
Urban Areas ◽  
Seismic Energy ◽  
Focal Mechanisms ◽  
Tien Shan ◽  
Seismic Events ◽  
Ministry Of Education ◽  
Geophysical Research ◽  
Seismic Arrays ◽  
The Republic ◽  
Northern Tien Shan

In 2013, seismic monitoring in Kazakhstan was conducted by two organizations: the Seismological Experience-Methodical expedition of the Ministry of Education and Science of the Republic of Kazakhstan (SEME), and the Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan (IGR). The station network consists of three-component stations and seismic arrays. The work presents detailed information on seismic observation networks. The catalogue of seismic events of Kazakhstan is made by da-ta of above mentioned Organizations. It includes 1036 earthquakes with energy class КР=6.6–14.7. The catalog contains several additional sheets with Attachments: Microseismic data on felt earthquakes, parameters of focal mechanisms of 55 earthquakes, information on coordinates of 29 urban areas with felt shakes, parameters of 1123 aftershocks, and two forshocks of Saryzhas (Narynkol) earthquake in the range of energy classes КР=4.5–11.8. Two maps of earthquake epicenters are shown in the paper: for the whole Kazakhstan territory with КР≥8.6 and for Northern Tien Shan territory with КР≥6.6. The largest earthquake of the year was the Saryzhas earthquake that occurred in Northern Tien Shan on January 28, MS=6.0, КР=14.7. The earthquake was felt on the territory of Kazakhstan and China and was followed by numerous aftershocks. For the first day, only its number exceeded 500. It was noted that the total released seismic energy in 2013 exceeded significantly the same parameter of 2012.

scholarly journals Analysis of the features of the spatio-temporal distribution of geoelectric inhomogeneities in the Earth’s crust and seismic events

2021 ◽  
Vol 254 ◽  
pp. 02003
Author(s):  
Elena Bataleva
Keyword(s):  
Temporal Distribution ◽  
Physical Nature ◽  
Tien Shan ◽  
Earth’S Crust ◽  
Seismic Events ◽  
Magnetotelluric Data ◽  
Geological Conditions ◽  
Spatio Temporal ◽  
Earth's Crust ◽  
The Relationship

The paper presents the results of experiments carried out at the regime points of magnetotelluric monitoring both on the territory of the Bishkek geodynamic test site (Northern Tien Shan) and on a series of monitoring profiles in various geological conditions. Previous studies indicate the relationship of variations in the electromagnetic and seismic fields, lunisolar tidal effects, seismic regime with the processes of fracturing. The purpose of this work is to establish the features of the relationship between the spatio-temporal distribution of seismicity and the distribution of geoelectric inhomogeneities in the Earth’s crust (fault-block tectonics of the region). Based on the analysis of the results of the interpretation of magnetotelluric data (2D inversion) and new detailed seismotomographic constructions, the verification of geoelectric models was carried out, the analysis of the distribution of hypocenters of seismic events was carried out. Special attention was paid to the confinement of earthquakes to listric fault structures. The relationship between the distribution of the hypocenters of seismic events and the spatial position of the electrical conductivity anomalies is confirmed by the authors explanation of the physical nature of the identified conducting structures, based on hypotheses of fluidization and partial melt of the Earth’s crust.

scholarly journals GEODYNAMICS

GEODYNAMICS ◽  
2011 ◽  
Vol 2(11)2011 (2(11)) ◽  
pp. 263-265
Author(s):  
O.Y. Riznichenko ◽  
◽  
I. Sanina ◽  
O.A. Usoltseva ◽  
◽  
...  
Keyword(s):  
Seismic Tomography ◽  
Temporal Variations ◽  
Energy Migration ◽  
Tien Shan ◽  
Seismic Events ◽  
Seismic Process ◽  
Velocity Models ◽  
Process Characteristics ◽  
Seismicity Parameters

Spatial-temporal variations of weak seismicity parameters were analyzed in the region of Talasso-Fergana fault in Tien Shan on the period 1962-1995 years. Heterogeneity of seismic process characteristics was showed in different fault sections. Relatively movable areas were revealed near the fault in the sense of energy migration of weak seismic events. Obtained results were compared with new seismic tomography P velocity models for upper part of lithosphere.

scholarly journals On the relationship of the extrema of lunar-solar tidal influences and seismic events

2020 ◽  
Vol 196 ◽  
pp. 02022
Author(s):  
Elena Bataleva ◽  
Ksenia Nepeina
Keyword(s):  
Experimental Data ◽  
Tien Shan ◽  
Seismic Events ◽  
Geological Environment ◽  
Tidal Effects ◽  
Seismic Regime ◽  
Time Frequency ◽  
Relationship Of ◽  
The Relationship ◽  
Northern Tien Shan

The paper considers experimental data obtained at stationary and regime points of magnetotelluric monitoring on the territory of the Bishkek geodynamic proving ground (Northern Tien Shan). The studies performed indicate the relationship of variations in the electromagnetic and seismic fields, lunar-solar tidal effects, seismic regime with the processes of fracturing. The results of the time-frequency analysis of the response of the geological environment to earthquakes in the electromagnetic field are presented, the features of manifestation depending on the location of the hypo-and epicenters of seismic events and their magnitude are considered. A number of responses in geophysical fields to remote and regional earthquakes of 2010-2020 with an energy class from 8 to 12 and their relationship with the extremes of lunar-solar tidal effects are considered.

scholarly journals On the dynamics of the electromagnetic parameters of the Northern Tien Shan lithosphere

2021 ◽  
Vol 254 ◽  
pp. 03004
Author(s):  
Elena Bataleva
Keyword(s):  
Electromagnetic Field ◽  
Deep Structure ◽  
Wide Frequency Range ◽  
Tien Shan ◽  
Seismic Events ◽  
Kyrgyz Republic ◽  
Electromagnetic Parameters ◽  
Regional Seismicity ◽  
Time Frequency ◽  
Northern Tien Shan

The results of geophysical monitoring of seismically hazardous regions are of undoubted interest for studying the deep structure of the lithosphere, regional seismicity, modern geodynamics, etc. The work used experimental material, including the results of magnetotelluric monitoring and the catalogs of the KNET (Kyrgyzstan Telemetered Network), KRNET (Kyrgyz Republic Digital Network) and ISC (International Seismological Center) networks obtained in the seismically active zones of the Bishkek Geodynamic Proving Ground (Northern Tien Shan). The analysis of electromagnetic monitoring results of the Northern Tien Shan seismic generating zone was carried out in a wide frequency range. The data on the parameters of the electromagnetic field of the Earth’s crust in the Northern Tien Shan are generalized and systematized. Based on the analysis of these data, the dependence of the response of seismic events in electromagnetic parameters on the distance of earthquake epicenters was studied. The most likely reason for the occurrence of anomalous changes in the electromagnetic field is the activation of deformation processes during the preparation of strong earthquakes. The results of the time-frequency analysis are presented and the features of manifestation are considered depending on the location of the hypoand epicenters of seismic events and their magnitude. Regularities have been established in the behavior of tipper variations for remote and regional earthquakes for the first quarter of 2016 with an energy class from 6 to 10.

scholarly journals On the question of the relationship of variations in geophysical fields, lunar-solar tidal effects and seismic events

2019 ◽  
Vol 127 ◽  
pp. 02019
Author(s):  
Elena Bataleva
Keyword(s):  
Tien Shan ◽  
Seismic Events ◽  
Tidal Effects ◽  
Geophysical Fields ◽  
Instrumental Observations ◽  
Solar Tide ◽  
Time Variations ◽  
Relationship Of ◽  
The Relationship ◽  
Made In

Based on the results of instrumental observations made in the Tien Shan, the interrelation of time variations of a number of geophysical fields and seismic events is established. According to the results of the correlation analysis, it was concluded that the fault zones are characterized by significantly higher variations of geophysical fields, an intense response to weak external influences in the form of a solid moon-solar tide.

Sign in / Sign up

Export Citation Format

Share Document