scholarly journals SEISMICITY of the AMUR and PRIMORYE, SAKHALIN, and the KURIL-OKHOTSK REGION in 2015

2021 ◽  
pp. 139-152 ◽  
Author(s):  
T. Fokina ◽  
D. Safonov ◽  
D. Kostylev ◽  
V. Mikhaylov
Keyword(s):  
Seismic Energy ◽  
Active Regions ◽  
Focal Mechanisms ◽  
Local Network ◽  
Seismic Events ◽  
Regional Network ◽  
Okhotsk Region ◽  
South Sakhalin ◽  
Deep Focus

A review of the Amur and Primorye, Sakhalin, and the Kuril-Okhotsk region seismicity for 2015 is presented on the basis of data from the regional network of stationary seismic stations of the Sakhalin branch of the Geophysical Survey RAS with the involvement of data from adjacent seismological Russian and foreign agencies, as well as ten stations of the local network operating in the south Sakhalin. Parameters of 1643 seismic events have been determined, 126 of them are explosions. Focal mechanisms were calculated for 62 earthquakes. 48 earthquakes have shown a macroseismic effect. A map of the epicenters is presented, the distribution of the number N of crustal and deep-focus earthquakes by a magnitude, a total seismic energy ∑E for seismically active regions of three regions are given, in comparison with the average parameters N and ∑E for 20012014. For each region, an analysis of the parameters of the seismic regime in 2015 is given in comparison with long-term averages, the maximum and significant seismic events are described. The seismicity of the Priamurye and Primorye, Sakhalin, and the Kuril-Okhotsk region in 2015 can be characterized as a moderate one.

scholarly journals SAKHALIN

2020 ◽  
pp. 152-161
Author(s):  
T. Fokina ◽  
D. Safonov ◽  
D. Kostylev ◽  
V. Mikhaylov
Keyword(s):  
Seismic Activity ◽  
Focal Mechanisms ◽  
Local Network ◽  
Seismic Events ◽  
Regional Network ◽  
Strong Earthquakes ◽  
Seismic Regime ◽  
Seismic Stations ◽  
Macroseismic Effect

A review of the Sakhalin seismicity in 2014 based on the data of regional network is given. The network included four stationary and ten temporary digital seismic stations. This network was supported by ten stations of local network operating in the south of Sakhalin. Parameters of 450 seismic events, including 25 explosions, and focal mechanisms for 4 events are determined. 22 earthquakes had a macroseismic effect. The map of earthquake completeness and the map of epicenters are given. The distribution of crust and deep earthquakes on magnitude and their summarized energy for seven seismoactive areas in comparison with average parameters for 2001–2013 are presented. For each area and the region as a whole, an analysis of the seismic regime parameters in 2014 in comparison with long-term parameters is given, tangible and strong earthquakes are described. The seismicity of the Sakhalin region in 2014 can be characterized as a moderate one. Somewhat increased seismic activity was recorded in the East Sakhalin and Southeastern areas.

scholarly journals Global earthquakes in the 2020 second half according to the GS RAS

2021 ◽  
Vol 3 (1) ◽  
pp. 7-26
Author(s):  
Yuri Vinogradov ◽  
Mariya Ryzhikova ◽  
Natalia Petrov ◽  
Svetlana Poygina ◽  
Marina Kolomiets
Keyword(s):  
Seismic Energy ◽  
Aegean Sea ◽  
Focal Mechanisms ◽  
Intraplate Earthquake ◽  
Strong Earthquakes ◽  
Tatar Strait ◽  
The Earth ◽  
Deformation Processes ◽  
The Russian Federation ◽  
Deep Focus

The data on the seismicity of the Earth in the second half of 2020 at the level of strong earthquakes with magnitudes mb≥6.0 are given according to the data of the Alert Service of the Geophysical Survey RAS. The review also includes information on 54 tangible earthquakes in Russia and five earthquakes in adjacent territories that were felt in the settlements of the Russian Federation. Two of 67 strong earthquakes of the Earth with mb≥6.0 for the period under consideration were registered in the territory of Russia. For 15 strong earthquakes, the Alert Service published Information Messages within one or two days after their occurrence, for 14 earthquakes the information on focal mechanisms is provided. The strongest earthquake of the Earth with MS=7.9 occurred on July, 22 in the region of the Alaska Peninsula. The maximum human casualties and material damage during the study period were the result of the catastrophic intraplate earthquake with MS=6.8, which occurred on October, 30 in the Aegean Sea, near the Samos Island. As a result of the earthquake, 117 people died, 1054 were injured. The strongest earthquake on the territory of Russia was the deep-focus one with mb=6.4, which took place on November, 30 in the Tatar Strait, separating Sakhalin Island from continental Eurasia. The crustal Bystrinsk earthquake on September, 21 with MS=5.2, which occurred in the area of Lake Baikal, was felt with a maximum intensity I=6–7 on the territory of Russia. Comparative analysis of the rate of seismic energy released in the Globe in 2010-2020 showed that its value in the second half of 2020, as well as for 2019-2020 on average, is one of the lowest for the eleven-year period and indicates a seismic calm, which should be replaced by a period of intensification of global seismic and deformation processes

scholarly journals SEISMICITY OF NORTHERN EURASIA in 2014

2020 ◽  
pp. 10-26
Author(s):  
Alexey Malovichko ◽  
Nataliya Petrova ◽  
Irina Gabsatarova ◽  
Oleg Starovoit ◽  
E. Rogozhin ◽  
...  
Keyword(s):  
Seismic Energy ◽  
Focal Mechanisms ◽  
Northern Eurasia ◽  
Seismic Process ◽  
Fold Belt ◽  
Seismic Regime ◽  
The Past ◽  
Source Zones ◽  
Regions Of Russia

An overview of Northern Eurasia seismicity in 2014 is given. This territory includes 16 regions of Russia and neighboring countries. Seismic monitoring was carried out by 618 stationary seismic stations, including 591 digital, 27 analog stations and eight seismic groups. Also, temporary stations operated in some re-gions. These networks have registered over 30 thousand tectonic and volcanic earthquakes, for 571 of them the focal mechanisms are determined. According to the data collected and presented in the Annual, 413 earthquakes were felt in settlements of Northern Eurasia in 2014, manifestations of 14 of them were surveyed and described in the special articles of this issue, together with data on the focal mechanisms, preceding seismicity, aftershock processes and seismotectonic conditions. Estimates of the number of earthquakes and seismic energy released in 2014 in the regions of Northern Eurasia in comparison with long-term characteristics of seismic regime indicate that in most regions the seismic process proceeded in the “background” or “background lowered” regimes accor-ding to the definition on the SOUS'09 scale. Only the level of seismicity in the Pribaikalye and Transbaikalia region is assessed as “background increased”. The intensification of seismicity in the source zones of the past strongest earthquakes in the Alpine-Himalayan collision-fold belt – Crimean 1927, Spitak 1988, Zakatala 2012 – is noted. The tangible earthquakes that occurred in the previously aseismic areas of the Siberian and Turan platforms – Gonam earthquake on January 4 with KP=14.2, I0=8, Boguchan earthquake on January 17 with KP=13.3, I0=7 and Karaganda earthquake on June 21 with KP=11.7, I0=5–6 – indicate the need to revise the concept of a low seismic hazard in these platform areas.

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 KURIL-OKHOTSK REGION

2020 ◽  
pp. 162-171
Author(s):  
T. Fokina ◽  
D. Safonov ◽  
E. Doroshkevich ◽  
D. Kostylev
Keyword(s):  
Seismic Energy ◽  
Active Regions ◽  
Strike Slip ◽  
Depth Interval ◽  
Earthquake Parameters ◽  
Okhotsk Region ◽  
Maximum Value ◽  
The Pacific ◽  
North Eastern ◽  
Japanese Islands

The review of the Kuril-Okhotsk region seismicity in 2014 is presented. Earthquake parameters were obtained on the basis of the data of the seismic stations of Sakhalin branch GS RAS and the data of neighboring seismological Russian and foreign agencies. 83.6 % of earthquakes are located within the depth interval of h80 km, 13.5 %  within the intermediate layer h=81–300 km, 2.9 % of earthquakes have depths h>300 km; the maximum depth of the hypocenter was h=559 km. The analysis of the seismic situation in 2014 in comparison with the data for 2001–2013 is carried out, a description of the seismic situation in seismically active regions is given. For 30 earthquakes information was obtained on the macroseismic effect in Russia, the maximum intensity did not exceed Ii=5; for 50 earthquakes there was information on the intensity in the territory of the Japanese Islands, the maximum value was Ii =67 by the MSK-64 scale. The strongest earthquake in the region occurred in the central part of the Sea of Okhotsk on September 18 at 04h17m with h=529 km and MSH=6.2. Its focal mechanism is classified as an incision with a small right-lateral strike-slip component along a subvertical plane of north-eastern strike. The seismicity of the region in 2014 can be considered as a moderate, the number of earthquakes with a magnitude MP≥4.5 and their total seismic energy do not exceed the average values over a 13-year period, the level of seismicity of the region according to the SOUS’09 method is classified as а “background average”. The distribution of earthquake hypocenters and their focal mechanisms show that most of the earthquakes in the Kuril-Okhotsk region relate to the process of the subduction of the Pacific lithospheric plate under the Okhotsk Sea plate.

scholarly journals PRIAMURYE AND PRIMORYE

2019 ◽  
pp. 161-172
Author(s):  
N. Kovalenko ◽  
T. Fokina ◽  
D. Safonov
Keyword(s):  
Seismic Energy ◽  
Northern China ◽  
Stable Operation ◽  
Primorye Region ◽  
Crustal Earthquakes ◽  
Shallow Earthquakes ◽  
Deep Focus ◽  
Positive Effect

The review of seismicity of Amur and Primorye in 2013 according to the data of permanent seismic sta-tions’s network of the Sakhalin branch of the GS RAS is presented. Maps of the representative registration of earthquakes (Mmin), of epicenters of earthquakes and explosions are presented. Distributions of shallow earthquakes by T.G. Rautian energy classes КR, and of deep-focused by magnitude MPVA are shown; total amount of seismic energy released in six seismoactive areas is given. The results of observations of after-shock activity of Skovorodino earthquake on October 14, 2011 (M=6.2) are presented. Seismicity recorded in 2013 is compared with the results of long-term observations. In general, the seismic regime of the Pri-amurye and Primorye region in 2013 is identical to that in 2012. The Turano-Bureinsky district (No. 4) con-tinues to be the dominant region in terms of released seismic energy of crustal earthquakes, which is similar to the previous year. The more stable operation of seismic stations in 2013 had a positive effect on the quality of seismic events in the catalog. There is a noticeable shortage of small events in the catalog (with КР≤6.5) despite this. This is mostly relevant to Stanovoy District No. 1 and Yankan-Tukuringra-Dzhagdinsky No. 2 regions. There was a significant increase in the total amount of released seismic energy of deep-focus earthquakes in the Sikhote-Alin area No. 5 in 2013. The peculiarity of 2013 was a slight in-crease in the number of recorded technogenic events, the largest of which are located on the territory of northern China. In most parts of the Amur and Primorye region the level of seismic activity in 2013 re-mained moderate.

scholarly journals AMUR AND PRIMORYE

2020 ◽  
pp. 140-151
Author(s):  
N. Kovalenko ◽  
T. Fokina ◽  
D. Safonov
Keyword(s):  
Seismic Activity ◽  
Background Level ◽  
Seismic Energy ◽  
Annual Review ◽  
Crustal Earthquakes ◽  
Area 5 ◽  
Deep Focus ◽  
First Time ◽  
Lower Background

The annual review of seismicity of Amur and Primorye based on the data of permanent seismic stations of Sakhalin branch GS RAS and the data of other Russian and foreign seismological agencies for 2014 is made. A detailed description of the seismic situation in different areas of the region is given. For the first time the Sikhote-Alin area (№5), where an earthquake of intensity I0=5 occurred, has dominated by terms of the released seismic energy level. Three tangible earthquakes were recorded in the region during the year. The most significant of them (Imax=5) earthquake occurred on April 12 at 21h22m east of Lake Khanka, in the ter-ritory of Primorye. Previously this territory was in the state of a seismic calm. A comparative analysis of the seismic situation in 2014 with the data of long-term observations is carried out. In 2014 the seismic energy of crustal earthquakes released in the region was one of the lowest for the past 15 years (2000–2014), except for 2006. The level of deep focus seismicity in 2014 also has low indicators. According to the methodology for assessing the level of seismic activity, the SOUS*09 scale, in 2014 the territory of Amur and Primorye is characterized by a lower background level of seismic activity.

scholarly journals SEISMICITY of YAKUTIA in 2015

2021 ◽  
pp. 173-181
Author(s):  
S. Shibaev ◽  
B. Kozmin ◽  
A. Makarov
Keyword(s):  
Seismic Energy ◽  
Active Regions ◽  
Focal Mechanisms ◽  
The Arctic ◽  
Macroseismic Data ◽  
The South ◽  
Seismic Stations

The results of monitoring the seismicity of the territory of Yakutia, based on observations of 23 digital seismic stations, are presented. A total of 607 earthquakes were recorded. A map of epicentres was compiled and their location was given in seismically active regions. The most active areas are Olekminsk in the south, Verkhoyansk and Chersky Ridge in the northeast and the Arctic part of the region. A significant decrease (19 times) in the amount of released seismic energy continued in comparison to its level in 2014. Instrumental and macroseismic data, focal mechanisms and seismotectonic connections are analyzed. The characteristics of the shaking South-Verkhoyansk earthquake occurring at the junction of the Verkhoyansk and Sette-Daban Ridges are considered.

Focal mechanisms of earthquakes related to the 29 November 1975 Kalapana, Hawaii, earthquake: The effect of structure models

1981 ◽  
Vol 71 (3) ◽  
pp. 713-729 ◽  
Author(s):  
R. S. Crosson ◽  
E. T. Endo
Keyword(s):  
Main Shock ◽  
Horizontal Layer ◽  
Focal Mechanisms ◽  
Local Network ◽  
The South ◽  
Low Velocity ◽  
Tectonic Model ◽  
Low Velocity Layer ◽  
Using Data ◽  
Velocity Layer

abstract Initial focal mechanism determinations for the 29 November 1975 Kalapana, Hawaii, earthquake indicated discrepancy between the mechanism determined from teleseismic data by Ando and the mechanism determined using data from the local U.S. Geological Survey network surrounding the epicenter region. The resolution of this difference is crucial to correctly understand this earthquake, as well as to understand the tectonics of the south flank of Kilauea volcano. When a model with a low-velocity layer at the base of the crust is used for projection back to the focal sphere for the local network mechanisms, the discrepancy vanishes. To further investigate this result, focal mechanisms were determined using several contrasting models for a set of well-recorded earthquakes. A large number of these earthquakes have mechanisms identical to the main shock when the low-velocity layer model is used. Dispersion of P and T axes is also minimized by use of this model. A low-angle slip direction, favored for the main shock and typical of most other solutions, exhibits remarkable stability normal to the east rift zone of Kilauea. Our results suggest a tectonic model, similar in nature to that proposed by Ando, in which the south flank of Kilauea consists of a mobile block of crust which is relatively free to move laterally on a low-strength zone at about 10 km depth. Forceful injection of magma along the rift zones provides the loading stress which is released by catastrophic failure in the weak, horizontal layer in a cycle of perhaps 100 yr.

scholarly journals Analysis of long-term observations of the groundwater level In an aseismic region

2019 ◽  
pp. 47-67
Author(s):  
A. A. Lyubushin ◽  
O. S. Kazantseva ◽  
A. B. Manukin
Keyword(s):  
Time Series ◽  
Groundwater Level ◽  
Atmospheric Pressure ◽  
Active Regions ◽  
Sampling Interval ◽  
Pressure Effects ◽  
Adaptive Compensation ◽  
Groundwater Level Fluctuations ◽  
And Cluster Analysis

The results of the analysis of continuous precise time series of atmospheric pressure and groundwater level fluctuations in a well drilled to a depth of 400 m in the territory of Moscow are presented. The observations are remarkable in terms of their duration of more than 22 years (from February 2, 1993 to April 4, 2015) and by the sampling interval of 10 min. These long observations are suitable for exploring the stationarity of the properties of hydrogeological time series in a seismically quiet region, which is important from the methodological standpoint for interpreting the similar observations in seismically active regions aimed at earthquake prediction. Factor and cluster analysis applied to the sequence of multivariate vectors ofthe statistical properties of groundwater level time series in the successive 10-day windows after adaptive compensation for atmospheric pressure effects distinguish five different statistically significant states of the time series with the transitions between them. An attempt to geophysically interpret the revealed states is made. Two significant periods – 46 and 275 days – are established by spectral analysis of the sequence of the transitions times between the clusters.

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