..., 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...

...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 INTEGRATED IN-SITU STRESS ESTIMATION BY HYDRAULIC FRACTURING AND BOREHOLE OBSERVATION AT EXP-1 HOLE IN POHANG OF KOREA Hanna Kim and Ki-Bok Min (kbmin...

... ABSTRACT: We estimate the absolute stress value at the earthquake source region of a small cubic area in Homestead valley fault segment which broke during the Landers earthquake, using seismic stress drop and rotations of stress axes during the event. We obtained the pre-seismic compressive...

... is explained how the natural stress tensor field was assessed by considering these few measurements and a stress inversion analysis based in a slip analysis with discontinuity data collected at the powerhouse chamber site. Even tough, there is no a clear evidence to validate the estimated natural stress tensor...

..., we proposed a theory of measurement to apply the DCCBO technique to orthotropic rock. Second, a numerical experiment was carried out to confirm the effectiveness of the proposed measurement theory. orthotropic rock experiment isotropic assumption method estimation perpendicular reservoir...

... be obtained by interpretation of these phenomena disclosed during the excavation of the auxiliary tunnels and the underground testing sites. Based on these data, the multi-methods integration analysis is carried out to estimating the regime, orientation and magnitude of the in-situ stress at this site...

... and shafts. Japan Atomic Energy Agency (JAEA) has been investigating the development of a methodology to estimate the in situ stress field based on limited stress measurements. In this paper, the numerical simulation methods developed to consider horizontal stress due to plate tectonics are introduced...

... hydraulic fracturing good rock mass estimation water injection permeability packer minimum insitu stress headrace tunnel case study Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Estimation of minimum insitu stress by hydrojacking method case...

... of the piezomagnetic stress meter are discussed in theory and practical application on the detail. This system first processes error and estimates precision about measured value by least-squares method, studentized residuals method and coordinate transformation. Precision estimation have two steps: assessing...

... ABSTRACT: A hybrid method for constraining all three principal in situ stresses and their directions around vertical boreholes at great depths is described. It involves hydraulic fracturing tests for estimating the minimum horizontal stress and its direction. The vertical stress is computed...

... ABSTRACT: Downhole microseismics has gained in popularity in recent years as a way to characterize hydraulic fracturing sources and to estimate in-situ stress state. Conventional approaches only utilize part of the information contained in the microseismic waveforms such as the P/S amplitude...