SEISMIC ACTIVITY AND OPERATION OF SEISMIC STATIONS IN DAGESTAN AND ADJACENT AREAS FOR 2017-2018

2019 ◽  
Vol 76 (1) ◽  
pp. 32-37
Author(s):  
O.A. Asmanov ◽  
Keyword(s):  
Seismic Activity ◽  
Seismic Stations

scholarly journals Seismogenic ancient structures of the central and northern part of the East European platform

2019 ◽  
Vol 489 (4) ◽  
pp. 405-408
Author(s):  
V. V. Adushkin ◽  
I. A. Sanina ◽  
G. N. Ivanchenko ◽  
E. M. Gorbunova ◽  
I. P. Gabsatarova ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Seismic Activity ◽  
East European Platform ◽  
Historical Earthquakes ◽  
Seismic Array ◽  
Small Aperture ◽  
Seismic Stations ◽  
East European

The analysis of the location of the epicenters of earthquakes that occurred in the central and northern part of the East European platform in 2009-2016, recorded by the seismic stations of the GS RAS and the small aperture seismic array of IGD RAS Mikhnevo was performed. The results obtained indirectly indicate the seismic activity of the Riphean structures of the region, disturbing the surface of the basement, and their possible activation at the present time. Available data on historical earthquakes also confirm their relevance to paleorifts. It seems important to take into account the position of the ancient aulacogens in assessing the seismic hazard of the East European platform.

scholarly journals Seismic activity on the territory of Slovakia in 2018

2019 ◽  
Vol 49 (4) ◽  
pp. 511-523
Author(s):  
Róbert Kysel ◽  
Andrej Cipciar ◽  
Kristián Csicsay ◽  
Lucia Fojtíková ◽  
Martin šugár ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Earth Science ◽  
Routine Data ◽  
Seismic Events ◽  
Seismic Stations ◽  
National Network ◽  
Macroseismic Observations ◽  
The Earth ◽  
Short Period ◽  
Academy Of Sciences

Abstract The National Network of Seismic Stations of Slovakia (NNSS) consists of eight short period and five broadband permanent seismic stations and a data centre located at the Earth Science Institute of the Slovak Academy of Sciences (ESI SAS). The NNSS recorded and detected 11704 seismic events from all epicentral distances in 2018. Totally 86 earthquakes originated in the territory of Slovakia in 2018. This paper provides basic information on the configuration of the NNSS, routine data processing, seismic activity on the territory of Slovakia in 2018 as well as macroseismic observations collected in 2018.

scholarly journals Seismic activity on the territory of Slovakia in 2020

2021 ◽  
Vol 51 (4) ◽  
pp. 373-389
Author(s):  
Róbert KYSEL ◽  
Andrej CIPCIAR ◽  
Martin ŠUGÁR ◽  
Kristián CSICSAY ◽  
Lucia FOJTÍKOVÁ ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Earth Science ◽  
Routine Data ◽  
Seismic Events ◽  
Seismic Stations ◽  
National Network ◽  
Macroseismic Observations ◽  
The Earth ◽  
Short Period ◽  
Academy Of Sciences

The National Network of Seismic Stations of Slovakia (NNSS) consists of eight short period and six broadband permanent seismic stations and a data centre located at the Earth Science Institute of the Slovak Academy of Sciences (ESI SAS). The NNSS recorded and detected 11229 seismic events from all epicentral distances in 2020. Totally 96 earthquakes originated in the territory of Slovakia in 2020. This paper provides basic information on the configuration of the NNSS, routine data processing, seismic activity on the territory of Slovakia in 2020 as well as macroseismic observations collected in 2020.

scholarly journals SEISMISITY of THE VOLCANIC AREAS of KAMCHATKA in 2015

2021 ◽  
pp. 349-361
Author(s):  
S. Seniukov ◽  
I. Nuzhdina
Keyword(s):  
Real Time ◽  
Volcanic Activity ◽  
Seismic Activity ◽  
Continuous Monitoring ◽  
Seismic Energy ◽  
Satellite Observation ◽  
Video Observation ◽  
Seismic Stations ◽  
Thermal Anomalies ◽  
Earthquake Distribution

The results of near real-time monitoring of the active Kamchatka volcanoes are described. Continuous monitoring was carried out using three remote methods: 1) seismic monitoring according to automatic telemetric seismic stations; 2) visual and video observation; 3) satellite observation of the thermal anomalies and the ash clouds. Annual results of seismic activity of the Northern (Shiveluch, Kluchevskoy, Bezymianny, Krestovsky, and Ushkovsky), the Avacha (Avachinsky, and Koryaksky), the Mutnovsky-Gorely volcano groups and the Kizimen volcano are presented. 5464 earthquakes with КS=1.8–8.1 were located for the Northern volcano group, 302 earthquakes with КS=1.7–5.7 – for the Avacha volcano group, 295 earthquakes with КS=2.1–6.8 for the Mutnovsky-Gorely volcano group, 462 earthquakes with КS=2.2–8.3 for Kizimen volcano, and 165 earthquakes with КS=2.5–8.4 for Zhupanovsky volcano in 2015. Maps of epicenters, quantities of seismic energy and earthquake distribution by energy classes are given. All periods of activity were fixed and investigated by remote methods in 2015: intensive volcanic activity of the Sheveluch volcano associated with a new cone; the summit explosive-effusive eruption of the Kluchevskoy volcano in January–April; and a continuation of seismic and volcanic activity of the Zhupanovsky volcano after 56-year quite period.

Approach to study the seismicity in the Perunica Glacier, Livingston Island, Antarctica

2021 ◽  
Author(s):  
Gergana Georgieva ◽  
Liliya Dimitrova ◽  
Dragomir Dragomirov
Keyword(s):  
Seismic Activity ◽  
Seismic Noise ◽  
Seismic Station ◽  
Velocity Model ◽  
Noise Power ◽  
Noise Sources ◽  
Seismic Stations ◽  
Glacial Origin ◽  
Livingston Island ◽  
The Antarctic

<p>The seismicity caused by the movement of glaciers was discovered only 30-40 years ago, and it was initially assumed that only glaciers in Greenland create this type of seismicity. Today, a significant part of the earthquakes registered by the Antarctic seismic stations are of glacial origin. In recent years, scientists' interest in studying the seismic activity of glaciers and its relationship to various environmental factors has increased due to the response of the ice mass to climate change.</p><p>The interest of studying seismicity of Antarctica has increased in the last decade with installation of a growing number of seismic stations in the region.</p><p>In 2015, with the first installation of the LIVV seismic station, Bulgarian seismologists began studying the seismicity of the Perunika Glacier, located on Livingston Island, Antarctica. Between 2015 and 2018, seismic recordings were made only in the astral summer, and from January 2020 the seismic station was installed for year-round operation. The seismic station is located near the glacier.</p><p>In this study, an approach to analyze the ice generated events recorded during all working period of the LIVV station is presented. Depending on the source mechanism and therefore the different waveform shapes, several types of icequakes and earthquakes are distinguished.</p><p><span>Registered icequakes are more than 16000. Its duration varies between less than a second and more than a minute. A few events are several minutes long. We</span> <span>have noticed that from 2015 to 2020, the number of glacier events is increasing while its duration is decreasing. </span></p><p>Localization of the ice generated events with duration below 1 s is calculated. In the localization procedure, a velocity model developed for the area of the seismic station is applied. The produced icequake epicenters are grouped in several clusters within the Perunika glacier. The nature of these glacier events are still studying.</p><p><span>Another approach to study the seismic activity of the glacier is carried out by estimating the ambient seismic noise. Frequent and spectral distribution of the power of seismic noise is made over the seismic data recorded during all working periods. It is concluded that </span><span>t</span>he noise sources in the periods around 0.5 s are linked to the dynamic processes in the Perunika Glacier<span>.</span> Some relationship between the change in <span>the </span>noise power in the 0.2-0.6s period band and tidal cycles has been found.</p><p><span><strong>Acknowledgment:</strong></span><span> The presented study is supported by project: No 70.25-171/22.11.2019 “Study the activity of the Perunika glacier during year-round deployment” funded by the </span><span>National Center for Polar Studies, Bulgaria</span><span>.</span></p>

Micro-seismicity of the Northern Sea of Galilee - Before and During the July-August 2018 Seismic Swarm

2020 ◽  
Author(s):  
Ittai Kurzon
Keyword(s):  
Seismic Activity ◽  
Time Windows ◽  
Sampling Rate ◽  
Seismic Network ◽  
Seismic Stations ◽  
Seismic Swarm ◽  
The North ◽  
Seismic Catalogue ◽  
High Sampling ◽  
High Sampling Rate

<p>This study presents observations and analysis from a high-sampling-rate micro-seismic network, located at the north of the Sea of Galilee, Israel. Stations’ locations were chosen following the seismic swarm at the North of the Sea of Galilee, in October 2013, aiming to perceive a better understanding of the seismicity and structure of this area, in light of that anomaly seismic swarm, and of the seismic activity along the Dead Sea Fault. The micro-seismic network was active between May 2016 to August 2018, with six stations altogether, in distances of 3-5km around the northern Sea of Galilee.  Each of the micro-seismic stations had two collocated sensors: 1) GS-1 Geospace, 1 Hz vertical seismometers, sampled at 500 samples per second, and 2) 3-channel Episensor embedded in a Rock+ Kinemetrics datalogger, sampled at 200 samples per second. Towards the dismantling of the network, another swarm, stronger in magnitude, and longer in duration, has occurred in July-August 2018, roughly at the same location. Meanwhile, a significant upgrade of the Israel Seismic Network (ISN) was taking place, also densifying the number of stations around the Sea of Galilee.</p><p>The seismic processing presented here has many steps of verification, at all levels: detection, association, and location.  Processing begins with the local high-sampling-rate micro-seismic stations, tuning the most appropriate micro-seismic detectors, and association, location and magnitude parameters. Then this new generated micro-seismic catalogue is used to reveal lower magnitude events within the ISN stations, followed by relocation and re-magnitude estimations, done to those events that have additional information from the ISN stations. Running this process for increasing time-windows, it is demonstrated how the use of micro-seismic instrumentation can increase the seismic catalogue by an order of magnitude, providing higher resolution of the seismicity, both in space and time.</p><p>These efforts, of increasing the seismic catalogue, and improving their locations, are utilised for two main goals: a) obtaining a clearer picture of the seismicity and structure in the area before and during the seismic swarm of July-August 2018, b) Zooming into the interesting micro-seismic activity just before the initiation of the swarm.</p>

scholarly journals URAL

2019 ◽  
pp. 256-267 ◽  
Author(s):  
Aleksey Malovichko ◽  
Ruslan Dyagilev ◽  
F. Verkholantsev ◽  
I. Golubeva ◽  
T. Zlobina
Keyword(s):  
Seismic Activity ◽  
Wide Spectrum ◽  
Seismic Network ◽  
Seismic Events ◽  
Induced Earthquakes ◽  
Rock Falls ◽  
Seismic Regime ◽  
Seismic Stations ◽  
Chelyabinsk Meteorite ◽  
Tectonic Earthquakes

The article shows the monitoring results of the Ural region seismic network in 2013. It describes the seismic stations and registration abilities of the network. The analysis of seismic activity in Ural in 2013 and infor-mation about changes of the regional seismic regime since 2006 are given. The seismicity in the Ural is unique as it is presented by a wide spectrum of natural earthquakes (tectonic, earthquakes due to collapse, impact) as well as induced earthquakes (explosions, rock falls, rockbursts). Whereby the number of explosions in the region predominates among other seismic events, the number of rockbursts is much more than tectonic earth-quakes. A structural ordering can be seen for tectonic earthquakes. They tend to the basic geologic structure of the region to the Main Ural Fault. The induced events tend to mining regions. Also, there is a weak scat-tered seismicity that is typical for platform territories. Acting since 1999 the regional seismic network pro-vides the representative registration on the magnitude level ML≥2.5. In general in 2013 in Ural it was regis-tered 173 seismic events, and their basic seismic parameters were determined. The common number of in-dustrial explosions was 173. The summarized seismic explosions energy was 3.99E+9 Joules. The number of rockbursts was 29; their seismic energy was 2.82E+9 Joules. The five tectonic earthquakes made the min-imal contribution to the seismicity of the region. The unique event registered by seismic network was the ex-plosion of Chelyabinsk meteorite, and its parameters are shown in the article. Parameters of all mentioned above seismic events are presented in catalogue. The strongest events with ML≥3.0 including Chelyabinsk meteorite explosion, are considered separately, including their seismograms and parameters provided by other international seismic centers. The article shows the map with the actual locations of regional seismic stations and event epicenters in 2013. Generally the seismic regime of the region in 2013 was quite calm; the summarized seismic explosions energy was low. The trend to the seismic activity decay continues since 2010. The location of the natural and induced seismic events in space confirms the active zones previously determined.

scholarly journals Seismic activity on the territory of Slovakia in 2016

2019 ◽  
Vol 49 (1) ◽  
pp. 1-10
Author(s):  
Róbert Kysel ◽  
Andrej Cipciar ◽  
Zuzana Chovanová ◽  
Kristián Csicsay ◽  
Lucia Fojtíková ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Earth Science ◽  
Routine Data ◽  
Seismic Events ◽  
Seismic Stations ◽  
National Network ◽  
Macroseismic Observations ◽  
The Earth ◽  
Short Period ◽  
Academy Of Sciences

Abstract The National Network of Seismic Stations of Slovakia (NNSS) consists of eight short period and five broadband permanent seismic stations and a data centre located at the Earth Science Institute of the Slovak Academy of Sciences (ESI SAS). The NNSS recorded and detected 10888 seismic events from all epicentral distances in 2016. Totally 87 earthquakes originated in the territory of Slovakia in 2016. This paper provides basic information on the configuration of the NNSS, routine data processing, seismic activity on the territory of Slovakia in 2016 as well as macroseismic observations collected in 2016.

scholarly journals A detailed analysis of some local earthquakes at Somma-Vesuvius

1999 ◽  
Vol 42 (3) ◽  
Author(s):  
P. Capuano ◽  
U. Coppa ◽  
G. De Natale ◽  
F. Di Sena ◽  
C. Godano ◽  
...  
Keyword(s):  
Detailed Analysis ◽  
Frequency Band ◽  
Seismic Activity ◽  
Focal Mechanisms ◽  
Ground Acceleration ◽  
Spectral Parameters ◽  
Seismic Stations ◽  
Local Earthquakes ◽  
Seismic Swarms ◽  
Order Of Magnitude

In this paper, we analyze local earthquakes which occurred at Somma-Vesuvius during two episodes of intense seismic swarms, in 1989 and 1995 respectively. For the selected earthquakes we have computed accurate hypocentral locations, focal mechanisms and spectral parameters. We have also studied the ground acceleration produced by the largest events of the sequences (ML 3.0), at various digital stations installed in the area during the periods of higher seismic activity. The main result is that seismicity during the two swarm episodes presents similar features in both locations and focal mechanisms. Strong site dependent effects are evidenced in the seismic radiation and strong amplifications in the frequency band 10-15 Hz are evident at stations located on the younger Vesuvius structure, with respect to one located on the ancient Somma structure. Furthermore, seismic stations show peak accelerations for the same events of more than one order of magnitude apart.

scholarly journals SAKHALIN

2019 ◽  
pp. 173-183 ◽  
Author(s):  
T. Fokina ◽  
D. Safonov ◽  
D. Kostylev ◽  
V. Mikhaylov
Keyword(s):  
Seismic Activity ◽  
Strong Earthquake ◽  
Focal Mechanisms ◽  
The South ◽  
The West ◽  
Seismic Stations ◽  
Macroseismic Effect ◽  
Deep Earthquakes ◽  
Background Seismicity ◽  
Increased Activity

The review of seismicity for Sakhalin in 2013 based on the data of four seismic stationary stations and 10 temporary digital seismic stations "DAT", working in the south of Sakhalin, is given. The main parameters of 688 earthquakes and focal mechanisms of five of them are determined. 42 earthquakes showed a macroseismic effect. The maps of the representativeness of earthquakes and of epicenters are given, the distribution of crust and deep earthquakes on the magnitude and their summarized energy for seven seismoactive districts are presented. For each area, seismic conditions are described. The seismicity of the Sakhalin region in 2013 can be characterized as moderate. Somewhat increased seismic activity was recorded in the East Sakhalin region, against the background seismicity in previous years. Somewhat increased activity was also recorded in the West Sakhalin region, where a moderately strong earthquake occurred with MLH=5.1.

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