Global ETD Search
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Showing 1 to 10 of 10 for “"Fault Plane Solutions"”.
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An Analysis of Focal Parameters with Application to West Texas Micro-Earthquakes
… distribution, magnitudes and focal mechanism solutions in the Permian Basin. Seismic anisotropy, a typical property in fractured sedimentary rocks, may bias the identification of the location of microseismic events if using isotropic models, a common practice in seismic monitoring. To …
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The tectonics and three-dimensional structure of spreading centers--microearthquake studies and tomographic inversions
… 5 and 8 km beneath the seafloor. Composite fault plane solutions for two spatially related groups of microearthquakes beneath the inner floor indicate normal faulting along fault planes that dip at angles of 300 or more.
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The tectonics and three-dimensional structure of spreading centers : microearthquake studies and tomographic inversions
… 5 and 8 km beneath the seafloor. Composite fault plane solutions for two spatially related groups of microearthquakes beneath the inner floor indicate normal faulting along fault planes that dip at angles of 30° or more. Microearthquakes also occur beneath the steep eastern inner rift …
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Anisotropy, focal mechanisms, and state of stress in an oilfield : passive seismic monitoring in Oman
… events. In the first analysis, 43 reliable fault plane solutions (FPSs) are determined using polarities and amplitudes of direct P-, SV- and SH-waves based on a pure double-couple source. The principal stress directions are estimated using the method of Gephart and Forsyth (1984) from FPSs. …
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Seismic chacterization of Vulcano island and Aeolian area by tectonic and seismo-volcanic events
… relocations, along with an analysis of the fault plane solutions. In order to improve our knowledge on the active seismo-tectonics areas we exploited a dataset encompassing 351 events recorded during a 17 year period (1993-2010). Overall, our results show that part of the seismicity is …
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Seismicity associated with magmatic intrusions: insights from the Reykjanes Peninsula, southwest Iceland
… to analyse the geometry and slip of the fault planes in individual earthquakes; and analysis of the orientation of mapped fractures, I infer that pre-existing structures exert primary control on the orientation of dyke-related faulting, almost all of which occurs on approximately …
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Retrieval of earthquake source parameters in inhomogeneous anisotropic mediawith application to swarm events in West Bohemia in 2000
… of rock mostly as shear ruptures along a rupture plane. Beside this, mechanisms other than pure shearing have been observed for some earthquakes mainly in volcanic areas. Possible explanations include complex rupture geometries and tensile earthquakes. Tensile earthquakes occur by opening or …
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Tectonic earthquake swarms in the Northern Volcanic Zone, Iceland
… aftershocks to destructive earthquakes on large faults, magma movement at volcanoes, or the gradual advance of glaciers. Microearthquakes at faults might also signal more exotic behaviour, including due to transient events such as fluid injections or pulses of aseismic fault creep. The study of …
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Seismicity and structure of the Orozco transform fault from ocean bottom seismic observations
… and crustal structure of the Orozco transform fault. Most of the data were collected by a network of 29 ocean bottom seismometers (OBS) and hydrophones (OBH) which were deployed as part of project ROSE (Rivera Ocean Seismic Experiment). Additional information is provided by magnetic anomaly and …
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Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity
As hard rock mining progresses into higher stress mining conditions through either late stage extraction or mining at depth, the rock mass is driven not just to the peak strength, but often well into the post-peak until complete ‘failure’ occurs and easier mining conditions become evident. Limited …