.... The overall granite rock mass may be viewed as a combination of stiff elastic blocks separated by soft low strength material, leading to a fairly large scale homogeneous axisymmetrical stress field with vertical axis, with local strong anomalies that correspond to either high or low stress magnitudes...

... is a principal stress direction and that the maximum horizontal principal stress orientation is very steady over this area ( N 153±15" E). II has also provided means to establish a vertical profile for the magnitude of all principal stress components. Results are shown on figure 2. They outline a very small...

... Abstract Three measurement campaigns were carried out by Natural Resources Canada CANMET Laboratories over the last thirty years within the Red Lake Gold District, Ontario, to determine the magnitude and orientation of in-situ rock stresses on several levels of the Campbell and Red Lake gold...

... of a hydraulic fracture barely touch each other provides a unique way to determine the minimum principal stress magnitude. This hydraulic testing method has been adapted to measuring the pressure required to reopen mechanically a preexisting fracture of known orientation (HTPF method). Today, for crystalline...

... Reservoir Characterization accretionary prism sonic velocity reservoir geomechanics stress magnitude OHmax Upstream Oil & Gas Finland Johansson Chang stochastic approach principal stress misfit effective stress ln-5itu rock stress Magnitude Artificial Intelligence OHmin rock...

.... The maximum variation of stress magnitude and orientation is ca. 11 MPa and 70°. Brittle deformation zones were, however, modelled as best-fit planes and the effect of true discontinuous, curved I bending /undulating faults remains unclear until the next planned model revision. Additionally, local parameter...

... algorithm Magnitude seismic event Rock stress contact zone 7th International Symposium on ln-5itu Rock Stress May 10-12, 2016, Tampere, Finland Johansson & Raasakka (ads) ISBN 978-951-758-606-1 ISSN 0356-9403 EVALUATION OF INDUCED SEISMICITY RISK IN THE PYHAsALMI MINE Mateusz Janiszewski...

.... In general the measured orientations are consistent with FEM results, aHhough slight variations and some of switch in position of principal rock stresses can be seen. The magnitude of the measured principal stress agrees favorably with the FEM results for the measurements 1 and 3. In the case...

.... In particular, the time of ice cover and related forebulge, maximum thickness of the ice cover, and the retreat of the ice cover are considered. Modelling results demonstrate that the magnitudes and the stress drops of the induced seismic events associated with fracture slip tend to be the largest under stress...

..., breakout azimuths can be used to estimate stress orientation, but breakout geometry (width) should not be used to estimate stress magnitudes. The orientation of the maximum horizontal principal stress (SHmax) is determined to be NE-SW to -2000 mbsf, subparallel to the subduction margin between Philippine...

... (CCBO) technique. Measurement period is from 1991 to 2015. Main results obtained in this study can be summarized as follows. The magnitudes of the three-dimensional principal stresses and the vertical stress at one year after the earthquake were more than double those before the earthquake...

... Fracturing test DIFS Breakout Figure 1. The orientation of maximum horizontal stress with depth (GeoGeny, 2012). 334 7th International Symposium on ln-51tu Rock stress May 10-12,2016, Tampera, Finland Johansson & Raasakka (ads) ISBN 978-951-758-806-1 ISSN 0356-9403 ORIENTATION AND MAGNITUDE OF IN-SITU...

... solely for the stress determination. The redundant data set allows us to determine both of the stress magnitude and orientation in multiple ways, and the validity of rasuHs can be confirmed from their consistency. In order for applying this concept to the stress measurement at deep depth, we have been...

... of a phenomenon that causes the elastic modulus to vary with the first stress invariant; effectively the confinement provided to the rock fabric. Measurements indicate that the elastic modulus in coal measure strata (elastic modulus range 3 GPa to 40 GPa) typically doubles in magnitude from an unconfined state...

... Amadei Reservoir Characterization Rock stress stress model zang stress field stress orientation rock mass Magnitude principal stress Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 How to generate the Final Rock Stress Model (FRSM...

... sequences. By geological data, we found that different stress conditions might be the main reason. aftershock sequence Earthquake Tibetan Plateau Wenchuan Earthquake vibration relation strain energy earthquake sequence Wenchuan sequence Magnitude aftershock region chi-chi sequence...

... STRESS TENSOR FIELD Natural stress tensor field can be assessed by three different scales: regional scale, local scale and punctual scale. Reservoir Characterization nstf assessment assessment porce iii hydroelectric project Magnitude reservoir geomechanics stress magnitude plane...

... INSTRUCTIONS On May 12, 2008, the Wenchuan earthquake with a moment magnitude of 8.0 occurred on the NE-SW trending Longmenshan fault zone at the eastern margin of the Tibetan Plateau, just west of the Sichuan basin, China. It not only caused severe damage to infrastructure, but also triggered a large number...

..., and including the change compositions with extremely complex and meaningful information with very rich. The clear precursor change features and impending informations were remarkably demonstrated before some earthquakes with different epicentral distances and magnitudes. Specifically, there were some unloading...

... of stress within, and beyond, the area affected by the stress concentration surrounding the excavation. When possible, hydraulic fracturing is used to provide independent information about the magnitude of the least principal stress, but is not used to estimate the maximum horizontal principal stress...