Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Focal mechanism"”.
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Deep learning framework bridges lab and field scale microseismic focal mechanism
… moment tensor inversion of microseismic source mechanisms is particularly useful as these tensors can highlight the kinematics and kinetics of subsurface deformation. However, these inversions can be difficult to constrain and automate in field applications owing to the requirement of a …
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Hypocenter Locations and Focal Mechanism Solutions of Earthquakes in the Epicentral Area of the 1886 Charleston, SC, Earthquake
… constrain earthquake hypocenter locations and focal mechanisms. Hypocenter locations of 134 earthquakes indicate a south-striking, west-dipping seismogenic zone in the upper 12 km of the crust. Over 40% of the 66 well-constrained focal mechanisms show reverse faulting on approximately …
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Stress tensor estimates derived from focal mechanism solutions of sparse data sets: applications to seismic zones in Virginia and eastern Tennessee
… the directions of principal stresses from focal mechanism solutions, under the assumption that the stress is homogeneous throughout the seismic zone. That method is called the Multiple Solution per Earthquake Technique (MSET), and utilizes each member of multiple focal mechanism solution …
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Determining the focal mechanisms of earthquakes by full waveform modeling
Determining the focal mechanism of an earthquake helps us to better characterize reservoirs, define faults, and understand the stress and strain regime. The objective of this thesis is to find the focal mechanism and depth of earthquakes. This objective is met using a full waveform modeling method …
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Computer derived focal mechanisms for selected earthquakes off the south and west coasts of Turkey
Focal mechanisms of earthquakes, two of them in the Gulf of Antalya and one in the eastern Aegean Sea, were determined by using both P-wave polarities and S-wave polarization angles. Additionally, a focal mechanism solution for a third Gulf of Antalya earthquake was determined from P-wave …
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Relocation of Eastern Tennessee Earthquakes Using hypoDD
… the hypocenter relocations oriented according to focal mechanism nodal planes derived from events within several, dense clusters of earthquakes. The northwestern boundary of the seismic zone corresponds to the steep magnetic gradient of the New York-Alabama lineament. The double-difference …
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A fault-controlled geothermal system in Tarutung (North Sumatra, Indonesia)investigated by seismological analysis
… of the basin, the seismicity delineation and the focal mechanism correlate with the shape and the characteristics of the strike-slip Sumatran fault. Within the Tarutung basin, the seismicity is distributed more broadly which coincides with the margin of the basin. An extensional duplex system in …
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Test of a method for recognizing unmapped seismogenic faults.
… I projected the nodal planes from each of eight focal-mechanism solutions for earthquakes with reported epicenters within the Pt. Dume quadrangle to define their intersection with a digital elevation model (DEM) of the ground surface. The intersection of a nodal plane with the ground surface is …
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Linking onshore and offshore data to find seismogenic faults along the Eastern Malibu coastline.
… data, digital elevation models, earthquake focal mechanism solutions, and field work. Several faults, many of which are previously-unmapped, have been identified in the study area, and determined to be potentially seismogenic. Results show that active seismogenic faulting in the Santa Monica …
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Towards Enhanced Earthquake Resilience: Linking Early Warning Systems, Ground Motion Prediction, and Stress Field Analysis
… dynamics and faulting patterns. Using data from focal mechanism catalogs, we investigate stress orientations and their role in earthquake triggering and fault reactivation. The findings highlight the importance of accurately modeling stress conditions and fault structures to refine seismic hazard …
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Injection Induced Seismicity Modeling and Application to the Karapiti Reinjection Area, Wairakei, New Zealand
… applying the developed seismic sequence model, focal mechanism research and earthquake cluster analysis reveal the characteristics of the Wairakei fracture geometries. The seismogenic hydraulic and mechanical properties of the Karapiti formations and fractures are also identified using a …
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Integrative risk-based assessment modelling of safety-critical marine and offshore applications
… domain in which Bayes' theorem is the focal mechanism of inference processing. The proposed FL model incorporating fuzzy set theory and an evidential reasoning synthesis has been demonstrated on the FPSO-shuttle tanker collision scenario. The FL and BN models have been combined via mass …
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Orientation of the maximum horizontal stress (SHmax) in the Orange basin and Outeniqua sub-basins of South Africa : neotectonic implications
… to obtain in the absence of earthquake-derived focal mechanism solutions (so called "beach balls"). In South Africa however, extensive hydrocarbon exploration drilling in the Mesozoic offshore provide an opportunity to utilise the borehole breakout technique to derive quality SHmax orientation …
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Poroelastic modeling of groundwater and hydrocarbon reservoirs : investigating the effects of fluid extraction on fault stability
… was promoted (depth -5 km). Published InSAR and focal mechanism results support a rupture plane aligned with the antithetic fault. The final stress change was ~0.03 MPa which is small but not negligible compared to the expected total stress drop (~2 MPa). In California, the production from Well …
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Fault plane structure of the 1995 Antofagasta Earthquake (Chile) derived from local seismological parameters
… processes. The investigation of 295 aftershock focal mechanism solutions supported the resulting fault plane structure and proposed a 3D similar stress state in the area of the Antofagasta fault plane.
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Continental Tectonics from Dense Array Seismic Imaging: Intraplate Seismicity in Virginia and a Steep Cratonic Margin in Idaho
… by a 29° strike and 53° dip consistent with the focal mechanism of the main shock. A 5° bend along strike and a shallower dip angle below 6 km points toward a more complex concave shaped fault zone. The seismic study in Idaho and Oregon was centered on the inversion of controlled-source …
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Geophysical and geochemical constraints on the evolution of oceanic lithosphere from formation to subduction
… network was not capable of providing robust focal mechanism solutions to constrain the source characteristics. In Chapter 3 I find that the Juan de Fuca plate, which represents the young/hot end-member of oceanic plates, is lightly hydrated at upper crustal levels except in regions affected …
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Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity
… The PCA technique, numerical modelling and focal mechanism studies are used to define significant stages of the failure process, in which a similar macrofracture structure was formed. Temporal observations of key source parameters show significant changes prior to and at the point of …
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Formal safety assessment of marine applications
… domain in which Bayes' theorem is the focal mechanism of inference processing. A methodology aiming in finding the probability of failure when having variables ruled by uncertainty is established using certain variable transformation methods through the First and Second order …
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