Topographic, geologic and cavity effects on the harmonic content of tidal strain

Blair, D. P.

doi:10.1111/j.1365-246x.1977.tb03679.x

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…In this case, significant impacts of cavity effects should be noted as such effects are maximum when the tool is installed (in a vertical or horizontal position) across the tunnel. According to calculations reported in [Harrison, 1976;Blair, 1977], horizontal strain is variable:…”

Section: Elastic Modulimentioning

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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Section: Elastic Modulimentioning

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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“…Evans (1975) has argued that the local geology can account for the general pattern of the observed variations. However, the observed variation is about five times larger than simple calculations suggest, and a full finite element model (such as used by Berger & Beaumont 1976;Blair 1977) should be constructed to perform the full calculations. This has not yet been attempted, so the question of the presence of any residual variation at Colwall, not imposed by known topography or geology, remains open.…”

Section: O L W a L Lmentioning

confidence: 99%

A survey of Earth strain tides in Great Britain

Evans

Beavan

Bilham

et al. 1979

Geophysical Journal International

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We report 35 measurements of Earth strain tides at 16 near-surface sites in Great Britain. This is the first widespread survey undertaken specifically to examine the problem of the inhomogeneity of elastic strain fields near the Earth's surface. Some sites were instrumented intensively in order to examine variations of tidal admittance over distances of several hundred metres, while measurements from single instruments at other sites were compared with theoretically predicted strain tides. After allowing for cavity and topographic effects, our data show variations of up to 50 per cent in tidal admittance. We interpret such large anomalies as being due to variations in the regional elastic parameters of wavelength about a lOOm or less. The data indicate that strain measurements from single instrument sites must be interpreted with caution.

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Instrumentation for Terrestrial Measurements of Geodynamics and the Main Sources of Disturbance

Kavanagh

Nato Science Series: IV: Earth and Environmental Sciences

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Topographic, geologic and cavity effects on the harmonic content of tidal strain

Cited by 9 publications

References 3 publications

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

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

A survey of Earth strain tides in Great Britain

Instrumentation for Terrestrial Measurements of Geodynamics and the Main Sources of Disturbance

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