A5037198272- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Seismic Performance and Analysis
- Advanced Fiber Optic Sensors
- Dynamics and Control of Mechanical Systems
- Drilling and Well Engineering
- Earthquake Detection and Analysis
- Inertial Sensor and Navigation
- Geotechnical and Geomechanical Engineering
- 3D Shape Modeling and Analysis
- Wind and Air Flow Studies
- Hydraulic Fracturing and Reservoir Analysis
- Vibration and Dynamic Analysis
- High-Velocity Impact and Material Behavior
- Astronomical Observations and Instrumentation
- Geological Formations and Processes Exploration
- Optical measurement and interference techniques
- Geological and Geochemical Analysis
- Contact Mechanics and Variational Inequalities
- Mechanical and Optical Resonators
- Geophysical Methods and Applications
Charles University
2013-2024
Czech Academy of Sciences
2007
Interest in measuring displacement gradients, such as rotation and strain, is growing many areas of geophysical research. This results an urgent demand for reliable field-deployable instruments these quantities. In order to further establish a high-quality standard strain measurements seismology, we organized comparative sensor test experiment that took place November 2019 at the Geophysical Observatory Ludwig-Maximilians University Munich Fürstenfeldbruck, Germany. More than 24 different...
Research Article| September 01, 2013 Rotaphone, a Self‐Calibrated Six‐Degree‐of‐Freedom Seismic Sensor and Its Strong‐Motion Records Johana Brokešová; Brokešová aCharles University, Faculty of Mathematics Physics, Department Geophysics, V Holešovičkách 2, 180 00 Prague, Czech Republicjohana.brokesova@mff.cuni.cz Search for other works by this author on: GSW Google Scholar Jiří Málek bInstitute Rock Structure Mechanics, Academy Sciences, 41, 182 09 Republic Seismological Letters (2013) 84...
A new mechanical sensor system for recording the rotation of ground velocity has been constructed. It is based on measurements differential motions between paired sensors mounted along perimeter a rigid (undeformable) disk. The elementary creating pairs are sensitive low-frequency geophones currently used in seismic exploration to record translational motions. main features rotational flat characteristics wide frequency range from 1 200 Hz and sensitivity limit order 10−8 rad/s. Notable...
Rotaphone-CY is a six-component short-period seismograph that capable of the co-located recording three translational (ground velocity) components along orthogonal axes and rotational (rotation rate) around in one device. It mechanical sensor system utilizing records from elemental sensors (geophones) arranged parallel pairs to derive differential motions pairs. The are attached rigid frame anchored ground. model design, latest among various Rotaphone designs based on same principle...
We have developed and tested (calibration, linearity, cross-axis errors) a new six-degree-of-freedom mechanical seismic sensor for collocated measurements of three translational rotational ground motion velocity components. The device consists standard geophones arranged in parallel pairs to detect spatial gradients. instrument operates high-frequency range (above the natural frequency geophones, 4.5 Hz). Its theoretical sensitivity limit this is 10(-9) m/s rad/s rotation rate. Small size...
A comparative active experiment that is aimed at collocated measurement of seismic rotation rates along three orthogonal axes by means different methods described. The in a short-period range 6-20 Hz were obtained using methods: the 6C Rotaphone sensor system developed authors, commercial R-1 rotational Eentec, and small-aperture array twelve standard velocigraphs rectangular arrangement. Those are compared discussed detail. medium-size quarry blast was used as source. At distance...
Abstract A new model of the Rotaphone-D short-period seismic sensor with six degrees freedom is introduced. The basis instrument horizontal and vertical geophones in a special paired arrangement. designed for simultaneous collocated measurements rotational translational components ground motion. basic principle measurement briefly described. Careful calibration necessary this type measurement, which has two parts: preliminary based on laboratory characteristics individual geophones,...
The problem of reflection/transmission plane waves in homogeneous isotropic dissipative media is investigated. In media, the elastic moduli, seismic velocities and slowness vectors are complex-valued frequency-dependent. Results extensive computations R/T coefficients for incident at a interface presented discussed. all cases, "reference coefficients" considered, computed fixed frequency equal to reference f r , which moduli specified. influence angle incidence i attenuation γ wave on...