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 “"Seismic Energy"”.
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On the dissipation of seismic energy from source to surface
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1958.
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Friction-based control system for seismic energy dissipation with isolated stories
… in structures to increase the performance under seismic and/or wind loading either by adding stiffness or inducing counteracting forces which dissipate energy in various ways. In order to efficiently dissipate the seismic energy with existing schemes, large structural displacements are required. …
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Analysis of Seismic Signatures Generated from Controlled Methane and Coal Dust Explosions in an Underground Mine
Examination of seismic records during the time interval of the Sago Mine disaster in 2006 revealed a small amplitude signal possibly associated with an event in the mine. Although the epicenter of the signature was located in the vicinity where the explosion occurred, it could not be unequivocally …
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IMAGE-BASED MODELING AND PREDICTION OF NON-STATIONARY GROUND MOTIONS
Nonlinear dynamic analysis is a required step in seismic performance evaluation of many structures. Performing such an analysis requires input ground motions, which are often obtained through simulations, due to the lack of sufficient records representing a given scenario. As seismic ground motions …
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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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Comparison of Additively Manufactured and Wrought 17-4 PH Stainless Steels in Ultra Low Cycle Fatigue
… has potential to improve the optimization of seismic lateral force resisting components which dissipate seismic energy through large plastic strains; however, the ultra low-cycle fatigue performance of AM metals are not yet well understood. Void formation during the AM fabrication process has …
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Geologic interpretations of seismic scattering and attenuation for the Cianten Caldera and the surrounding area
… scale. The Cianten Caldera has been microseismically monitored along with the producing Awibengkok field as injections and fracing in that field have occurred. This microseismic data is analyzed with Multi Window Time Lapse Analysis (MWTLA) to find values for the scattering coefficient, …
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Evaluating Shear links for Use in Seismic Structural Fuses
… behavior including increased stiffness and energy dissipating ability. Both of these characteristics lead to reduced drifts during earthquakes, which in turn leads to a reduction of drift related structural and nonstructural damage. Shear links are being used for seismic energy dissipation …
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Common cyclicities in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River
Intraplate seismicity has no widely accepted explanation for its origin. The Hydroseismicity hypothesis, developed by Costain and co-workers, suggests that natural increases in hydraulic head, caused by transient increases in water table elevation, can be transmitted to hypocentral depths (10-25 …
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Analytical Development of A Plastic Hinge Detail for Steel SMFs
A modular plastic hinge seismic special detail has been developed for use in steel special moment frames (SMFs). The aim of the special detail design is to dissipate seismic energy through stable yielding of a beam "link" in plastic hinge region. Reliable and repeatable energy dissipation at high …
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Ocean bottom seismic scattering
Seismic studies of the oceanic crust, both experimental and theoretical, often assume a flat seafloor and laterally homogeneous crust. This is done regardless of the appearance in seismic data of obvious effects due to scattering from lateral heterogeneities both on and in the seafloor. Detailed …
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Large-Scale Cyclic and Hybrid Simulation Testing and Development of a Controlled-Rocking Steel Building System with Replaceable Fuses
… engineering practice utilize inelasticity in the seismic force resisting system to dissipate seismic energy and protect against collapse. Inelasticity in conventional structures can lead to structural damage distributed throughout the building and permanent drifts after the earthquake motion …
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Development and experimental validation of self-centering buckling-restrained braces with shape memory alloy
… significant structural damage to dissipate the seismic energy. The structural damage and the residual drift that may result from the inelastic response can make a building difficult, if not financially unreasonable, to repair after an earthquake. As a result, development of systems that return …
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Relocation study of Virginia earthquakes (1959-1981) using the Joint Hypocenter Determination and Joint Epicenter Determination methods
… hypocenters from data sets in the Giles County seismic zone (GCSZ) in southwestern Virginia and the central Virginia seismic zone (CVSZ). In the GCSZ six earthquakes, recorded both regionally and teleseismically and previously relocated jointly by Dewey and Gordon (1980), and nine earthquakes, …
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Seismic effects of the Caloris basin impact, Mercury
… plausibly formed as a consequence of focused seismic waves generated by the massive impact event. In this paper, we revisit the antipodal seismic focusing effects of the Caloris impact by developing physically consistent structure models for Mercury and parameterized seismic source models for …
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A study of the seismic structure of upper oceanic crust using wide-angle reflections
… homogeneity of oceanic crust on the scale of a seismic experiment is a condition that most methods of seismic interpretation depend on. Whether this condition is in fact true is largely unknown and only recently have efforts been made to test this hypothesis. This thesis is part of that effort …
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Sensitivity tests between Vs30 and detailed shear wave profiles using 1D and 3D site response analysis, Las Vegas Valley
… lateral resonance, focusing, and scattering from seismic energy attributed to the 3D small-scale heterogeneities of the shear-wave-velocity profiles that result in a 70% increase in peak ground velocity. Additionally, PGV ratio maps clearly establish that the increased amplification from the …
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Fault plane structure of the 1995 Antofagasta Earthquake (Chile) derived from local seismological parameters
… structures. This can be observed in teleseismic studies through the spatial distribution of slip and seismic moment release caused by the mainshock. Both parameters are often concentrated on patches on the fault plane with much higher values for slip and moment release than their adjacent …
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Development of Electromagnetic Friction Dampers for Improving Seismic Performance of Civil Structures
<p>Energy dissipation is critical to limiting damage to civil structures subjected to extreme natural events such as earthquakes. Friction is one of the most reliable mechanisms of energy dissipation that has been utilized extensively in friction dampers to improve seismic performance of civil …
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Delineating the Trace and Kinematics of the Long Point Fault in Houston, Texas using LiDAR Data and Continuous GPS Data
… soft sediments, and as a result very little seismic energy is accumulated to produce destructive earthquakes. However, creeping along these faults causes moderate to severe damage to hundreds of residential, commercial, and industrial structures that are part of the infrastructure in the …
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