Strain and displacement rates during a large earthquake in the South Baikal region

Timofeev, V. Yu.; Ardyukov, D. G.; Boyko, E V; Gribanova, E. I.; Semibalamut, V. M.; Тимофеев, А В; Yaroshevich, A. V.

doi:10.1016/j.rgg.2012.06.007

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…В эпохи сильных региональных землетрясений (магнитудой М > 5) вариации приливных параметров достигают 3-4 % в амплитудном факторе (А н /А т ), в сдвиге фазы Δφ = 1-3° при ошибке 0,5 %. Изменения упругих свойств во времени могут быть вызваны: деформированием земной коры в эпицентральной зоне сильных региональных землетрясений Байкальской рифтовой системы; изменением гидродинамических условий в зоне Главного Саянского разлома, расположенного в нескольких километрах севернее пункта наблюдений; изменением состояния зоны трещиноватости в горной долине по р. Талая (размеров, объемов, плотности и ориентации трещин) [23,24].…”

Section: заключениеunclassified

Laser Extensometer and Time Variation of Tidal Deformation

Timofeev¹,

Semibalamut²,

Ardyukov³

et al. 2019

Vestnik SSUGT

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Section: заключениеunclassified

Laser Extensometer and Time Variation of Tidal Deformation

Timofeev¹,

Semibalamut²,

Ardyukov³

et al. 2019

Vestnik SSUGT

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“…Согласно зарегистрированным деформографа ми данным (рис. 11), на поверхности деформации дос тигают ∆ε=2•10 -6 -3•10 -6 [Timofeev et al, 2012b]. При мощности слоя земной коры 25 км эффект, согласно соотношению (5), составит 4.8-7.2 мкгал.…”

Section: при плотности ρ=Constunclassified

Gravity variations and recent geodynamics of the south-western part of the Baikal region

Тимофеев¹,

Kalish²,

Стусь³

et al. 2013

Geodyn. Tectonophys.

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Modern methods for determination of gravity values make it possible to obtain measurements with the accuracy up to 10 -9 from g 0 of the normal value (up to 1 microgal = 10 m/sec 2 ). While all the systematic and periodic effects are excluded, a question is raised about stability of the gravity field of the Earth over time. Changes of the altitude (the Earth's radius) with time can be estimated with an accuracy of 0.1 mm by modern space geodetic techniques, such as VLBI method. Our experi ments for evaluation of stability of the gravity values over the past decades are based on the data obtained by Russian and foreign observatories using absolute ballistic laser gravimeters. The results put a limit of 10 -10 per year to changes of the Earth's radius. These estimations can be useful for testing hypotheses in tectonics.Measurements of nontidal variations of gravity (∆g), which were obtained from 1992 to 2012 at the Talaya seismic sta tion (located in the southwestern part of the Baikal region), are interpreted together with GPS observation data. At the Ta laya seismic station, the linear component of gravity variations corresponds to changes in the elevation of this site. The corre lation coefficient is close to the normal value of the vertical gradient of gravity. At this site, coseismic gravity variations at the time of the Kultuk earthquake (27 August 2008, Mw=6.3) were caused by a combined effect of the change of the site's elevation and deformation of the crust. Our estimations of the coseismic effects are consistent with results obtained by mod eling based on the available seismic data.Key words: monitoring of gravity variations, changes in the Earth's radius, rift zone, GPSmonitoring, earthquake.Recommended by V.A. San'kov Citation: Timofeev V. Yu., Kalish Ye.N., Stus' Yu.F., Ardyukov D.G., Arnautov G.P., Smirnov M.G., Timofeev A.V., Nosov D.A., Sizikov I.S., Boiko E.V., Gribanova E.I. 2013. Gravity variations and recent geodynamics of the southwestern part of Baikal region.

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“…Left-lateral shift motion takes place at the Main Sayan fault. According to the available geological data and tectonic models of south-western part of the Baikal rift zone, horizontal displacement rates are from 0.8 to 2.0 mm per year, and displacements are mainly directed to the east [San'kov et al, 1999[San'kov et al, , 2000Calais et al, 2002;Lukhnev et al, 2010;Timofeev et al, 2012Timofeev et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Local deformation and rheological parameters by measurements in Talaya station gallery (Baikal region)

Timofeev¹,

Masalsky²,

Ardyukov³

et al. 2015

Geodyn. Tectonophys.

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Tilt measurements have been taken in the underground gallery at Talaya Seismological Station for almost three decades, from March 1985 till 2014. Based on such data, deformation curves were constructed and analysed in the frame of elastic and viscous-elastic models of the geological medium. From estimated annual deformation rates, it became possible to reveal deformation cycles ranging from 3 to 18 years with amplitudes up to 5 arc-seconds (2·10 -5 ). For the bedrock in the Talaya stream valley, the elastic modulus was estimated at 20 GPa. In frame of the Kelvin viscoelastic model, the apparent viscosity of the medium was estimated at 10 19 Pa·sec by deformation delay curve for 1989-2014 epoch. Observed vertical rates were used to estimate the size of the studied area (from 0.1 km to 6.0 km). The values estimated in our experimental investigation are used in a wide range of geophysical studies: modelling tectonic, co-seismic and post-seismic processes.Key words: tidal quartz tiltmeter, viscoelastic model of deformation, apparent rheological parameters, Baikal region. Recommended by V.A. SankovFor citation: Timofeev V.Yu., Masalsky O.K., Ardyukov D.G., Timofeev A.V. 2015. Local deformation and rheological parameters by measurements in Talaya station gallery (Baikal region). Geodynamics & Tectonophysics 6 (2), 241-253. Аннотация: Наблюдения наклонов в штольне сейсмостанции Талая ведутся уже около трех десятилетий (с марта 1985 года по настоящее время). В работе представлены результаты измерений. Полученные графики хода деформаций анализируются с использованием упругих и упруговязких моделей геологической среды. Определены годовые скорости деформирования, выявлен его циклический характер с периодами от 3 до 18 R e c e n t G e o d y n a m i c s 241 V.Yu. Timofeev: Local deformation and rheological parameters…лет и амплитудами до 5 секунд дуги (2·10 -5 ). Различными методами определен упругий модуль коренных пород, слагающих долину р. Талой, его величина составила 20 ГПа. С использованием кривой затухания деформации за период 1989-2014 гг., в рамках вязкоупругой модели Кельвина получено значение эффективной вязкости среды 10 19 Па·с. С привлечением данных о скоростях вертикальных движений проведена оценка области, представительной для полученных параметров (от 0.1 до 6.0 км). Экспериментально определенные параметры могут быть использованы при моделировании тектонических, косейсмических и постсейсмических процессов.Ключевые слова: приливные кварцевые наклономеры, вязкоупругие модели деформирования, эффективные реологические параметры, Байкальский регион.

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Strain and displacement rates during a large earthquake in the South Baikal region

Cited by 5 publications

References 27 publications

Laser Extensometer and Time Variation of Tidal Deformation

Laser Extensometer and Time Variation of Tidal Deformation

Gravity variations and recent geodynamics of the south-western part of the Baikal region

Local deformation and rheological parameters by measurements in Talaya station gallery (Baikal region)

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