Destruction of Medieval Archaeological Monuments by Strong Earthquakes in the Southwestern Issyk-Kul Basin, Tien Shan

2021 ◽  
Vol 57 (1) ◽  
pp. 55-74
Author(s):  
A. A. Strelnikov ◽  
A. M. Korzhenkov
Keyword(s):  
Tien Shan ◽  
Strong Earthquakes

scholarly journals Features of atmospheric disturbances in temperate latitudes before strong earthquakes (M> 7) according to satellite measurements

2020 ◽  
Vol 149 ◽  
pp. 03011
Author(s):  
Valentin Kashkin ◽  
Leonid Sverdlik ◽  
Roman Odintsov ◽  
Tatyana Rubleva ◽  
Konstantin Simonov ◽  
...  
Keyword(s):  
Active Regions ◽  
Tien Shan ◽  
Atmospheric Effects ◽  
Satellite Measurements ◽  
Aftershock Activity ◽  
Strong Earthquakes ◽  
Atmospheric Disturbances ◽  
Temperature And Pressure ◽  
Correlation And Spectral Analysis ◽  
Northern Tien Shan

An ATOVS and MERRA data archive containing temperature values at isobaric levels from 1000 to 50 hPa was formed to study the atmospheric effects observed over the foci of two strong earthquakes with magnitudes M = 7,3. The first seismic event was recorded on August 19, 1992 in the northern Tien Shan and the second on November 12, 2017 in the border areas of the Zagros folded mountain belt. According to USGS intense aftershock activity in these regions began with these seismic events. Using correlation and spectral analysis we studied the vertical profiles of temperature and pressure in a disturbed atmosphere over seismically active regions. The modified anomaly index was calculated at isobaric levels from 500 to 50 hPa and on its basis the registered temperature anomalies were investigated.

scholarly journals Tracking the local seismicity level in the active influence zone of the southern Uzbekistan reservoirs

2021 ◽  
Vol 264 ◽  
pp. 02043
Author(s):  
Lutfulla Khamidov ◽  
Mahmud Turapov ◽  
Soqijon Mahkamov ◽  
Farkhod Artikov ◽  
Shavkat Suyunov
Keyword(s):  
Negative Impact ◽  
Tien Shan ◽  
Activity Levels ◽  
Human Engineering ◽  
Seismogenic Fault ◽  
Strong Earthquakes ◽  
Local Seismicity ◽  
Local Earthquakes ◽  
Engineering Activity ◽  
Mountain System

Assessment of local seismicity caused by human engineering activity is a necessity after several earthquakes have been recorded in world practice, which destroyed a hydraulic structure, a dam and accompanied by human casualties. The Tupalang, Gissarak and Pachkamar reservoirs, operated in southern Uzbekistan, are located in the mountain system of the southern part of the Tien Shan seismogenic fault. According to the general seismic zoning, the zones where these reservoirs are located are classified as 8-9 magnitude shakes during strong earthquakes. Localisation of local earthquakes associated with the operation of these reservoirs is necessary for taking operational measures to prevent possible emergencies associated with an increase in the level of technogenic seismicity. Methods for assessing the local seismic regime were used to track the level of local seismicity. The catalogs of local earthquakes occurring in the zone of active influence of reservoirs have been compiled. The seismic activity levels and changes in the angle of inclination of the recurrence of earthquakes were determined for each object separately. The dependence of the variation in the level of local seismicity on the mode of operation of reservoirs has been revealed. Several evidence of the negative impact of large hydraulic reservoirs on the deformation and seismic state of the zones of influence of reservoirs in southern Uzbekistan have been identified.

scholarly journals Correlation of the state of crustal stresses, seismicity and landslide activity (Fergana basin, Tien Shan)

2019 ◽  
Vol 10 (4) ◽  
pp. 995-1009
Author(s):  
Z. A. Kalmet’eva ◽  
B. D. Moldobekov ◽  
U. A. Abdybachaev
Keyword(s):  
Internal Structure ◽  
The State ◽  
Tien Shan ◽  
Stress Axis ◽  
Hazard Mapping ◽  
Upper Crust ◽  
Strong Earthquakes ◽  
Landslide Activity ◽  
Crustal Stresses ◽  
Local Stresses

The impacts of seismicity on the landslide activity in Kyrgyzstan have been in the focus of our study since 2010 [Kalmetyeva et al., 2010]. As the study progressed [Kalmetyeva, Moldobekov, 2012, 2013; Kalmetyeva et al., 2013, 2014], the initial problem statement has been revised as follows: do earthquake influence the occurrence of land‐ slides, and, if so, what is the mechanism of this influence. This paper presents the results of detailed analysis of the distribution of earthquakes and landslides in space and time in correlation with focal mechanisms (azimuth and plunge of the principal compression stress axis) of earthquakes occurred in the Fergana basin and its mountainous frame. These are grounds to conclude that the landslide activity is mainly influenced by the response of the internal structure of the upper crust to local stresses. The mechanism of influence of strong earthquakes on the landslide activity is redistribution of local stresses, which results from partial release of regional stresses due to rupturing in the source zones of strong earthquakes. Using this concept of the landslide activity, a methodology of landslide‐hazard mapping is the goal of our future studies aimed at the following: (1) zoning of the study area with respect to the features of the internal structure of the upper crust, (2) geological, geophysical and seismological studies of the state of stresses in the study area, (3) instrumental monitoring of landslides movements in the zones that differ in the structure of the upper crust, and (4) analysis of preparation and consequences of past strong earthquakes that took place in the study area in comparison with the landslide activity.

scholarly journals Atmospheric temperature coherent variations effects, preceding strong earthquakes

2020 ◽  
Vol 223 ◽  
pp. 03015
Author(s):  
Leonid Sverdlik ◽  
Sanjar Imashev
Keyword(s):  
Seismic Event ◽  
Atmospheric Temperature ◽  
Tien Shan ◽  
Abnormal Behavior ◽  
Satellite Measurements ◽  
Epicentral Area ◽  
Strong Earthquakes ◽  
Upper Troposphere ◽  
Short Period ◽  
Northern Tien Shan

We analyzed satellite measurements of temperature at upper troposphere/lower stratosphere (UTLS) levels separated by the tropopause above the epicentral area of a strong earthquake with a magnitude of M=7.3 in the Northern Tien-Shan (Kyrgyzstan) that took place on August 19, 1992. The developed algorithm and method of continuous wavelet transform allowed detecting of abnormal behavior, temporal, spatial and spectral coherence of short-period temperature variations, preceding the seismic event. The results show that the spatial structure and dynamics of temperature anomalies in the area of UTLS have a sufficiently stable relation to seismic activity.

scholarly journals The capabilities of analyzing the seismo-electromagnetic satellite CSES-01 data for monitoring of seismic activity of the Northern Tien Shan

2021 ◽  
Vol 929 (1) ◽  
pp. 012017
Author(s):  
K S Nepeina
Keyword(s):  
Space Weather ◽  
Tien Shan ◽  
Measuring Instruments ◽  
Research Station ◽  
Strong Earthquakes ◽  
Magnetotelluric Soundings ◽  
Future Technologies ◽  
The Relationship ◽  
Random Nature ◽  
Northern Tien Shan

Abstract The relationship between space weather and earthquakes occurring in seismically active areas with the seismo-electromagnetic satellite CSES-01 data are observed. The study assumes the presence of possible ionospheric precursors of strong earthquakes. The sets of measuring instruments of the satellite and data are considered. Subsequently, to prove the non-random nature of the space weather effects, the results of ground-based geomagnetic or electromagnetic observations should be used, for example, magnetotelluric soundings (MTS). Stationary and regime points of the MTS network of the Research Station RAS in Bishkek (RS RAS) are suitable for these purposes in the Northern Tien Shan. The MTS data are presented in the form of hourly frequency-time series with system rotation from 0° to 180°. To obtain information on earthquakes, it is proposed to use data from the NEIC or ISC seismic catalog, since they aggregate data from regional catalogs, including the KNET seismological network maintained by the RS RAS. It is concluded that it is necessary to select the CSES-01 trajectories and times of flight over the territory of Kyrgyzstan and download the electric field detector (EFD) data. The results of comparing satellite and ground-based observations can be used in future technologies for short-term earthquake prediction.

Research and Assessment of the Seismic Risk of Strong and Destroying Earthquakes on the Territory of Tajikistan

2020 ◽  
pp. 67-78
Author(s):  
Abdusamad M. Sanginov
Keyword(s):  
Sea Level ◽  
Earthquake Engineering ◽  
Residential Buildings ◽  
Experimental Studies ◽  
Tien Shan ◽  
Strong Earthquakes ◽  
Earthquake Resistant ◽  
Himalayan Belt ◽  
The Impact ◽  
Local Materials

The area of Tajikistan is 143.1 thousand km2, while about 93% of its territory is occupied by mountains, the maximum heights of which reach more than 7000 m above sea level. The rest of the country (7%) is plains and valleys with heights from 300 to 1000 m above sea level. Such a significant range of heights is explained by the location of the study area in the junction zone of the Tien Shan fold system and the Alpine-Himalayan belt and leads to a wide variety of geological, hydrogeological, landscape-climatic and seismic conditions, analysis of the consequences of destructive earthquakes is of great importance for solving scientific and practical problems in the field of seismology, as well as problems of earthquake-resistant construction. The analysis of consequences of destructive earthquakes is important for solving scientific and practical tasks in the field of seismology and problems of earthquake engineering. One of the main sources of seismic resistance assessment of buildings and structures, along with theoretical and experimental studies, is engineering analysis of the consequences of strong earthquakes. This article deals with the effects of earthquakes on the earth's surface. The example of the following devastating earthquakes that occurred in Tajikistan, the impact of these seismic events on various types of residential buildings built from local materials is considered, and the main reasons for the observed nature of deformations and destruction are discussed.

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