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.

Mercury levels in six species of Australian commercial fish

1980 ◽  
Vol 31 (4) ◽  
pp. 469 ◽  
Author(s):  
R Chvojka ◽  
RJ Williams
Keyword(s):  
Total Mercury ◽  
Size Range ◽  
Graphical Method ◽  
Correlation Coefficients ◽  
Mercury Content ◽  
Fish Length ◽  
Commercial Fish ◽  
The Relationship ◽  
Commercial Size ◽  
Zeus Faber

The total mercury content of six species of Australian commercial fish (John dory. Zeus faber: mirror dory. Zenopsis nebulosus; tiger flathead, Neoplatycephalus richardsoni; rubberlip morwong, Nemadactylus douglasii; jackass morwong, Nemadactylus macroprerus; and sand whiting, Sillago ciliata) is reported. Total mercury content is regressed against fish length and the resultant equations and correlation coefficients are presented for each species. A length-frequency histogram derived from the Sydney Fish Market data and a length-mercury content curve are plotted as an overlay for each of the six species. The integrated average mercury content (mg/kg) has been calculated for each species and these are as follows: sand whiting, 0.08; rubberlip morwong, 0.13; tiger flathead, 0.14; John dory, 0.14; mirror dory, 0.15; and jackass morwong, 0.16. The graphical method adequately demonstrates the relationship between mercury levels and the commercial size range of particular species.

A reappraisal of the 1950 (Mw 6.9) Mondy earthquake, Siberia, and its relationship to the strain pattern at the south-western end of the Baikal rift zone

Terra Nova ◽  
2002 ◽  
Vol 14 (6) ◽  
pp. 491-500 ◽  
Author(s):  
B. Delouis ◽  
J. Déverchère ◽  
V. Melnikova ◽  
N. Radziminovitch ◽  
L. Loncke ◽  
...  
Keyword(s):  
Rift Zone ◽  
Baikal Rift Zone ◽  
The South ◽  
Strain Pattern

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 First experience of seismodeformation monitoring of Baikal rift zone (by the example of South-Baikal earthquake of 27 August 2008)

2010 ◽  
Vol 10 (4) ◽  
pp. 667-672 ◽  
Author(s):  
G. V. Vstovsky ◽  
S. A. Bornyakov
Keyword(s):  
Rift Zone ◽  
Baikal Rift Zone ◽  
New Approach ◽  
Self Organized ◽  
Structural Functions ◽  
Modern Physics ◽  
Self Organized Criticality ◽  
Novel Method ◽  
Basic Ideas ◽  
South Baikal

Abstract. A novel method of data processing – a structural functions curvature analysis method – was applied to the time series of seismodeformation monitoring of Baikal rift zone from April to November 2008, revealing the unique features of monitoring variable behaviour that can be considered as a revelation of precursors to the intensive South-Biakal earthquake (M=6.3, at 09:31 on 27 August 2008). The idea of a new approach leans upon basic ideas of modern physics of self-organized criticality and open non-equilibrium systems in general.

Reliability of the Minimum Masking Level as Outcome Variable in Tinnitus Clinical Research

2020 ◽  
Vol 29 (3) ◽  
pp. 429-435
Author(s):  
Patricia C. Mancini ◽  
Richard S. Tyler ◽  
Hyung Jin Jun ◽  
Tang-Chuan Wang ◽  
Helena Ji ◽  
...  
Keyword(s):  
Standard Deviation ◽  
High Frequency ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Outcome Variable ◽  
Reliable Estimate ◽  
Moderate Correlation ◽  
Trained Subjects ◽  
The Relationship ◽  
Minimum Intensity

Purpose The minimum masking level (MML) is the minimum intensity of a stimulus required to just totally mask the tinnitus. Treatments aimed at reducing the tinnitus itself should attempt to measure the magnitude of the tinnitus. The objective of this study was to evaluate the reliability of the MML. Method Sample consisted of 59 tinnitus patients who reported stable tinnitus. We obtained MML measures on two visits, separated by about 2–3 weeks. We used two noise types: speech-shaped noise and high-frequency emphasis noise. We also investigated the relationship between the MML and tinnitus loudness estimates and the Tinnitus Handicap Questionnaire (THQ). Results There were differences across the different noise types. The within-session standard deviation averaged across subjects varied between 1.3 and 1.8 dB. Across the two sessions, the Pearson correlation coefficients, range was r = .84. There was a weak relationship between the dB SL MML and loudness, and between the MML and the THQ. A moderate correlation ( r = .44) was found between the THQ and loudness estimates. Conclusions We conclude that the dB SL MML can be a reliable estimate of tinnitus magnitude, with expected standard deviations in trained subjects of about 1.5 dB. It appears that the dB SL MML and loudness estimates are not closely related.

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