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 44 for “"seismic event"”.
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Automated seismic event location by waveform coherence analysis
Automated location of seismic events is a very important task in microseismic monitoring operations as well for local and regional seismic monitoring. Since microseismic records are generally characterised by low signal-to-noise ratio, such methods are requested to be noise robust and sufficiently …
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Analysis of the dynamic behaviour of the hangingwall beam during a seismic event
… of the isolated hangingwall beam during a seismic event. The study is particularly concerned with the global, resonant behaviour of the hangingwall and local shear or crushing failure of the rock at the shear fractures is not considered. A finite element program is developed to compute the …
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Double-Difference Seismic Event Relocation: A Study of the Applications and Limitations of the Relocation Problem
… of these travel time observations to refine event locations. This thesis focuses on the application of three double-difference methods based on differing geometries of data pairing: event-pair relocation, station-pair relocation, and double-pair relocation. In this thesis, I introduce a …
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Earthquake location using a 3D velocity model : an example in Sichuan Province, China
… of applying three-dimensional velocity models to seismic event location. We develop a technique for three-dimensional seismic event location, utilizing a finite difference method for travel time calculation and a grid search method for location. We apply this technique to the location of three …
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Seismic Wave Velocity Variations in Deep Hard Rock Underground Mines by Passive Seismic Tomography
… of the rock mass associated with mining-induced seismicity is poorly-understood. Passive seismic tomography is a tool with which the performance of a rock mass can be monitored in a timely manner. Using the tool of passive seismic tomography, the advance rate of operation and mining designs can …
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Detection and Kirchhoff-type migration of seismic events by use of a new characteristic function
The classical method of seismic event localization is based on the picking of body wave arrivals, ray tracing and inversion of travel time data. Travel time picks with small uncertainties are required to produce reliable and accurate results with this kind of source localization. Hence recordings, …
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The influence of structural details, geotechnical factors and environs on the seismic response of framed structures.
Seismic events around the globe directly affect all ranges of structures, from complex and expensive ‘skyscrapers’ to simple frame structures, the latter making up a higher proportion of the number of structures affected as they are a much more common type of structure. The impact of a seismic …
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Strategies for Seismic Assessment of Common Existing Reinforced Concrete Bridges Typologies
… and 2 are a sort of preliminary work before the seismic event occurs: the creation of a database to collect all information about bridges in specific road/railway networks (step 1) and the generation of fragility curves for each bridge (step 2): fragility curves are instruments describing the …
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Approximating the Seismic Amplification Effects Experienced by Solar Towers Mounted on the Rooftops of Low-Rise Industrial Buildings
… of low-rise industrial buildings during a seismic event. Specifically, this thesis looks to assess the validity of using amplification factors adopted by the ASCE 7-05Minimum Design Loads for Buildings and Other Structures to approximate seismic acceleration amplification for roof-mounted …
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Next generation seismic fragility curves for california bridges incorporating the evolution in seismic design philosophy
Quantitative and qualitative assessment of the seismic risk to highway bridges is crucial in pre-earthquake planning, and post-earthquake response of transportation systems. Such assessments provide valuable knowledge about a number of principal effects of earthquakes such as traffic disruption of …
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Computational and Experimental Investigation of Seismic Structural Fuse Shapes for Structural Systems
… damage, and then be replaceable after a major seismic event. A promising type of seismic structural fuse consists of a steel plate with engineered cutouts leaving a configuration of shear-acting links remaining. There have been several studies on various cutout patterns for shear-acting …
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Apparent Stress Estimates of Seismic Events Associated with Underground Mining Operations in Sedimentary Rock Units: Implications for Improving Underground Roof Collapse Warning Systems
We analyze recordings of seismic events induced by underground mining operations at the Moonee Colliery, located in Australia, and at the Springfield Pike Limestone Quarry, located in the United States. The data were recorded underground in the vicinity of active mining operations and were …
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2-D NON-LINEAR FINITE ELEMENT ANALYSIS OF FOLSOM DAM: SEISMICALLY INDUCED SEPARATION AND PORE PRESSURE ALONG THE SOIL-CONCRETE INTERFACE
<p>The seismic soil-concrete interface stability of composite dams has been an area of interest to many researchers. However, the true interface behavior during a seismic event has not been well understood. During a ground shaking, bonding and de-bonding action along the interface may cause …
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Structural Damage Detection Utilizing Experimental Mode Shapes
… by informing engineers of where damage, due a seismic event, has occurred before the removal of finishes for visual inspection. This thesis begins to answer the question “can structural damage be detected solely through analysis of experimentally measured mode shapes?”</p> <p>The work …
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Bio-Inspired Segmented Self-Centering Rocking Frame
… design and modeling of a human spine-inspired seismic lateral force resisting system. The overall goal is to create a design for a lateral force resisting system that reflects human spine behavior that is both practical and effective. The first phase of this project involved a literature review …
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Geophone Array Optimization for Monitoring Geologic Carbon Sequestration using Double-Difference Tomography
… injection into a depleted petroleum reservoir. Seismic events were created to represent induced seismicity from injection, and five different geophone arrays were created to monitor this artificial seismicity. Double-difference tomographic inversion was performed on 125 synthetic data sets: five …
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A Comprehensive Analysis of Station Performance for the Nevada Seismological Laboratory Network
… Laboratory (NSL)is responsible for monitoring seismic activity in this area, and over time has installed a robust seismic network to accomplish this goal. This study explores the seismic stations managed by the NSL with the aim of integrating sophisticated systems like ShakeAlert into Nevada's …
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Finite Element Analysis of the Application of Synthetic Fiber Ropes to Reduce Seismic Response of Simply Supported Single Span Bridges
Movement of a bridge superstructure during a seismic event can result in damage to the bridge or even collapse of the span. An incapacitated bridge is a life-safety issue due directly to the damaged bridge and the possible loss of a life-line. A lost bridge can be expensive to repair at a time when …
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Numerical Investigation of Cleavage Fracture in Welded Connections of Steel Moment Resistant Frames
… rates of the levels expected during a strong seismic event."
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Characterizing the Load-Deformation Behavior of Steel Deck Diaphragms using Past Test Data
… research has identified that current code level seismic demands used for diaphragm design are considerably lower than demands in real structures during a seismic event. However, historical data has shown that steel deck diaphragms, common to steel framed buildings, perform exceptionally well …
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