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 38 for “"Aftershocks."”.
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Aftershocks in engineering seismic risk analysis.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1973. M.S.
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The locations and characteristics of the aftershocks of the October 3, 1974, Peruvian earthquake
Locations of 113 aftershocks of the magnitude-7.6 (M<sub>s</sub>) Peruvian earthquake of October 3, 1974, were determined from data obtained by a ten-station network installed along the coastal area between lat 11° and 14° S. These epicenters define an irregular shaped zone approximately 210 km …
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Geophysical Imaging of Earth Processes: Electromagnetic Induction in Rough Geologic Media, and Back-Projection Imaging of Earthquake Aftershocks
… heterogeneity. Seismic signals generated by aftershocks are generally recorded by local aftershock networks consisted of insufficient number of stations which result in strongly spatially-aliased aftershock data. This limits aftershock detections and locations at smaller magnitudes. Following …
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Stochastic model for the simulation of synthetic main shock-aftershock ground motion sequences
… main shock, a structure may still face damaging aftershocks. The main shock-aftershock sequence may result in major damage and eventually the collapse of a structure. Current studies on seismic hazard mainly focus on the modeling and simulation of main shocks. This paper proposes a stochastic …
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Temporal properties of avalanche dynamics
… avalanche dynamics. These properties include aftershocks and foreshocks of slip avalanches in a bulk metallic glass, oscillations in the experimental setup affecting the ongoing avalanche dynamics, and temporal clustering of avalanches in systems with dynamic weakening.
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Improving statistical seismicity models
… expected in the spatial distribution of aftershocks. However, testing the different hypotheses is challenging because it requires the consideration of the large uncertainties involved in stress calculations as well as the appropriate consideration of secondary aftershock triggering which …
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Characteristics of Deep-Focus Earthquakes in the Northwestern Pacific
… deep earthquakes. Seismic moment released by the aftershocks during the 1995 Mariana sequence was found to amount up to 17% of the mainshock's moment. Such a high aftershock productivity is extremely unusual even for shallow earthquakes. Based on the inversion of broadband P and SH waveforms, …
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Seismic Source and Attenuation Studies in the Central and Eastern United States
… that explains the triggering mechnanism of those aftershocks. Second, I examine the S-wave attenuation at critical short hypocentral distances (< 60 km) using the aftershock data. The observed S-wave amplitudes decay as a function of hypocenter distance R according to R^-1.3 - R^-1.5, which is …
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Surface Wave Derived Shear Velocity Structure of the Gamburtsev Subglacial Mountains, Transantarctic Mountains, and West Antarctica and Shallow Seismicity of the Mariana and Tonga Subduction Zones
… seismic array designed to detect and locate aftershocks associated with the May 3, 2006 MW8.0 Tonga earthquake. The fault mechanism of this earthquake is unusual and has important implications for tsunami hazard associated with the Tonga subduction zone. Through high precision location of …
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A comprehensive study of the 26th December 2004 Sumatra earthquake: possible implications on Earth rotation and investigations on the coseismic and postseismic stress diffusion associated with the seismic rupture
… the Coulomb stress over the sequence of aftershocks taken from various catalogues in a time window spanning about two years and finally analyzed the spatio-temporal pattern. The analysis performed with the semi-analytical and the finite-element modeling gives a complex picture of the …
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Analysis and modeling of transient earthquake patterns and their dependence on local stress regimes
… the relative seismic moment release of the aftershocks with respect to the mainshocks; the spatial correlation between aftershock occurrence and fault deformation; and on the influence of aseismic transients on the aftershock parameter estimation. For the analysis of aftershock sequences I …
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Slip on ridge transform faults : insights from earthquakes and laboratory experiments
… few large earthquakes occur on RTFs, and few aftershocks follow the large events. Standard models of seismicity, in which all earthquakes result from the same seismic triggering process, do not describe RTF earthquakes. Instead, large earthquakes appear to be preceded by an extended fault …
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Negative interest rates : an effective monetary tool?
… the respective economies after a series of aftershocks from the global financial crisis of 2008. Consequently generating a significant amount of empirical data that economists can conclude from. The effects of negative interest rates are still a largely uncharted area of research. Still, a …
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Modeling Flow-Induced Microstructure of Inhomogeneous Liquid-Liquid Mixtures
… in polymer blends, predicting earthquake aftershocks, and modeling the flow of biological fluids. In order to model these systems, an exact Stokes flow solution is found for the deformation of a Newtonian droplet suspended in a Newtonian fluid with a different viscosity, for the case of …
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Data extrapolation in social sensing for disaster response
… calm and periods of disruptive change (e.g., aftershocks). A good prediction algorithm, therefore, needs to intelligently combine time-based data extrapolation during periods of calm, and spatial data extrapolation during periods of change. The thesis develops such an algorithm. The algorithm …
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Performance of Improved Ground and Reinforced Soil Structures during Earthquakes – Case Studies and Numerical Analyses
… region. Following the earthquake and significant aftershocks, Virginia Tech researchers traveled to Turkey to investigate the affected area to document geotechnical field performance. Primary focus of the Virginia tech team was given to investigating the performance of improved soil sites and …
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Improvement of aftershock models based on Coulomb stress changes and rate-and-state dependent friction
… to the redistribution of stresses by previous aftershocks (secondary triggering). I find that modeling secondary triggering improves model performance. The effect of afterslip is less clear, and difficult to assess for near-fault aftershocks due to the large uncertainties of the afterslip …
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Slip on ridge transform faults : insights from earthquakes and laboratory experiments
… few large earthquakes occur on RTFs, and few aftershocks follow the large events. Standard models of seismicity, in which all earthquakes result from the same seismic triggering process, do not describe RTF earthquakes. Instead, large earthquakes appear to be preceded by an extended fault …
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Source Parameters and Tectonic Setting of the 2017 St. Elias Earthquake Sequence near the Southern Terminus of the Eastern Denali Fault, Northwestern Canada
… events were followed by more than 2,700 aftershocks. Moment-tensor inversion of the mainshock signals shows that the initial event produced reverse slip on a steeply dipping fault with a NW-SE strike direction, while the second produced left-lateral strike-slip on a near-vertical fault …
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Hydrochemical Response of Groundwater Following the 2020 Monte Cristo Range Earthquake Sequence within Mineral and Esmeralda Counties, NV
… were observed following the initial shock and aftershocks >M 4, varying between sites and event. CM had significantly lower SpC values in the week following the May 15th event. During the early part of the seismic series, a period of high frequency and intensity aftershocks, MD showed a …
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