scholarly journals TRACES OF HIGH SEISMIC ACTIVITY IN THE UPPERMOST SEDIMENTS OF LAKE BAIKAL, SIBERIA

2021 ◽  
Vol 12 (3) ◽  
pp. 544-562
Author(s):  
E. G. Vologina ◽  
M. Sturm ◽  
Ya. B. Radziminovich
Keyword(s):  
Lake Baikal ◽  
Seismic Activity ◽  
Rift Zone ◽  
Sediment Cores ◽  
Historical Earthquakes ◽  
Baikal Rift Zone ◽  
Seismic Events ◽  
Research Activities ◽  
Entire Lake ◽  
South Baikal

Sedimentation in Lake Baikal is significantly affected by continuous seismic activity in the Baikal Rift Zone. Our study shows that historical earthquakes, as well as recent seismic events, considerably influenced sedimentation in this deep tectonic basin. Here we present some of the results of extensive international research activities during the period of 1996–2019. To identify traces of seismic events in the uppermost sediments (<1.5 m), short cores were recovered from many coring stations throughout the entire lake. Based on lithological descriptions, measurements of magnetic susceptibility, and concentration of inorganic and organic components, we identified earthquake indicators in the sediment cores. Impacts of historical earthquakes were traced within South Baikal (near the Sharyzhalgai Station and the Station 106-km of the Circum-Baikal railway, hereafter CBR) and Proval Bay (near the Selenga River delta).

scholarly journals BAYKAL and TRANSBAIKALIA

2019 ◽  
Author(s):  
Valentina Melnikova ◽  
N. Gileva ◽  
O. Masalskii
Keyword(s):  
Seismic Activity ◽  
Rift Zone ◽  
Baikal Rift Zone ◽  
Strike Slip ◽  
Focal Mechanisms ◽  
Normal Faults ◽  
Seismic Events ◽  
High Degree ◽  
South Baikal

The seismicity of Pribaikalye and Transbaikalia in 2013 is reviewed. 6706 earthquakes with КР≥5.6 were recorded there during that year. Most of them (92 %) are located in the Baikal rift zone. The high degree of clustering of seismic events is observed in South Baikal and Baikal-Muja areas. The largest earthquake with Mw=4.3 was in the Baikal-Muja area. Focal mechanisms of 47 earthquakes (КР9.6) were determined in 2013. Most of them correspond to normal faults, with strike-slip component contribution in some cases. Overall, the rate of seismic activity observed in Pribaikalye and Transbaikalia in 2013 was low.

scholarly journals VÝJIMEČNÉ ZEMĚTŘESENÍ JV. OD POZNANĚ (POLSKO) ZAZNAMENANÉ 6. 1. 2012

2012 ◽  
Vol 19 (1-2) ◽  
Author(s):  
Josef Havíř ◽  
Jana Pazdírková ◽  
Zdeňka Sýkorová
Keyword(s):  
Seismic Activity ◽  
Historical Earthquakes ◽  
Seismic Events ◽  
Local Magnitude ◽  
Sequence Of Events ◽  
The Earth ◽  
Moderate Earthquake ◽  
South Moravia

On January 6, 2012, a moderate earthquake was observed in a region SE of Poznań (local magnitude ML = 3.6 according to Institute of Physics of the Earth, IPE). In this region, there haven‘t been known any historical earthquakes so far, and no natural seismic activity has been observed up to present. Similar rare occurrences of weak and moderate earthquakes were observed in a region near Kaliningrad in 2004 (sequence of events, local magnitude of strongest event being 5.0) and in south Moravia region near Znojmo in 2000 (local magnitude ML = 2.5). These facts show that even in seismically quiet regions occurence of weak to moderate seismic events (with value of magnitude ranging from 3 to 5) could be expected.

scholarly journals Dynamics of the atmosphere and seismic activity in the Baikal rift zone

2015 ◽  
Vol 1 (3) ◽  
pp. 55-61 ◽  
Author(s):  
Ольга Кочеткова ◽  
Olga Kochetkova ◽  
Александр Михалев ◽  
Aleksandr Mikhalev ◽  
Владимир Мордвинов ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Seismic Activity ◽  
Rift Zone ◽  
Time Lag ◽  
Baikal Rift Zone ◽  
Upper Atmosphere ◽  
Lower Atmosphere ◽  
Atmospheric Effects ◽  
Atmospheric Emission ◽  
Activity Increase

We study the troposphere dynamics, temperature regime in the stratosphere, upper atmosphere emission, and seismic activity in the Baikal Rift Zone for winters 2011/2012 and 2012/2013. Variations of the lithospheric, tropospheric, stratospheric and mesosphe- ric characteristics occurred either simultaneously or with a time lag during these periods. We found that the wind speed in the lower atmosphere reached a maximum several days before the seismic activity increase in the region. Then, it de-creased to a minimum at the earthquake instant. The periods of this seismic activity growth coincided with episodes of stratospheric warm-ings and with an increase in the 557.7 nm atmospheric emission in the meso-sphere and the low thermosphere (85–115 km). A pos-sible reason for the correlations may be the increased atmospheric effects on mountains, the formation of vertical flows above mountains, and generation of planetary and gravity waves.

The Relationship between Powerful Geodynamic Impacts and an Increase in the Mercury Content of the Water of the Angara River Source (Baikal Rift Zone)

2021 ◽  
Vol 62 (2) ◽  
pp. 239-254
Author(s):  
A.V. Klyuchevskii ◽  
V.I. Grebenshchikova ◽  
M.I. Kuz’min ◽  
V.I. Dem’yanovicha ◽  
A.A. Klyuchevskaya
Keyword(s):  
Rift Zone ◽  
Correlation Coefficients ◽  
Seismic Energy ◽  
Baikal Rift Zone ◽  
Mercury Content ◽  
Sampling Station ◽  
The South ◽  
Mercury Release ◽  
The Relationship ◽  
South Baikal

Abstract —The results of Hg content determination in the water of the Angara River source are considered in relationship with the seismic processes proceeding at different levels of the lithosphere in the Baikal Rift Zone (BRZ), the geodynamic rejuvenation of the South Baikal rifting attractor structure (RAS), and the time distribution of M ≥ 7 earthquakes which occurred at a significant distance from the water sampling station. The correlation coefficients calculated between the pairs Hg content–earthquake numbers n and Hg–logarithm of summary seismic energy lgΣES are most often low, thus indicating the absence of a statistically meaningful relationship between the remote seismic process and the dynamics of mercury release. However, the correlation coefficients in the vicinity of the Angara River source are high, thus proving the relationship of the mercury release with the deformation of this territory. The statistical validity of the «deformation–mercury release» cause-and-effect relationship is verified by the fact that strong geodynamic impacts precede all meaningful Hg release maxima. In the period 1997–1998, the South Baikal RAS produced the highest impact, being in the phase of the maximum geodynamic activity. The combined impact of the RAS and the South Baikal earthquake of 1999 resulted in a series of the maximum mercury contents within 1999–2000. The subsequent gradual relaxation of the RAS activity led to a reduction in the average annual Hg content. Remote M ≥ 7 earthquakes and close strong earthquakes of the BRZ are responsible for the significant Hg release maxima. The predicted trend of the average annual Hg contents is their considerable increase in the fields of fluid discharge of faults under the powerful geodynamic impact of the RAS or strong earthquake. We assume that in the study lithosphere area, the powerful geodynamic impact caused an opening of fault zones leading to decompression with boiling and degassing of mercury and its rapid rise to the surface.

Microbial Community of Umkhei Thermal Lake (Baikal Rift Zone) in the Groundwater Discharge Zone

2019 ◽  
Vol 12 (6) ◽  
pp. 584-593 ◽  
Author(s):  
E. V. Lavrentyeva ◽  
T. G. Banzaraktsaeva ◽  
A. A. Radnagurueva ◽  
S. P. Buryukhaev ◽  
V. B. Dambaev ◽  
...  
Keyword(s):  
Microbial Community ◽  
Lake Baikal ◽  
Rift Zone ◽  
Groundwater Discharge ◽  
Baikal Rift Zone ◽  
Discharge Zone

scholarly journals Velocity models fitting for the seismic events location within the Baikal rift zone

2021 ◽  
pp. 38-51
Author(s):  
A. V. Belyashov ◽  
Ts. A. Tubanov
Keyword(s):  
High Velocity ◽  
Rift Zone ◽  
Baikal Rift Zone ◽  
Velocity Model ◽  
Seismic Events ◽  
Low Velocity ◽  
P Waves ◽  
Velocity Models ◽  
Lake Bottom ◽  
Selection Of

Whereas the defined velocity model plays a key role in the process of seismic events localization, so selection of the model as much as possible corresponding to the real velocity conditions of the investigated area becomes a crucial task. Basing on the analyses of published results of the Lake Baikal area seismic study a layered P-waves models for two situations defined: For the high velocity consolidated rock on the lake banks and low velocity sediments up to 10 km thick under the lake bottom.

Sign in / Sign up

Export Citation Format

Share Document