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- Anisotropy Modelling (1)
- Blatchford Lake Intrusion Complex (1)
- Crosswell Seismic Survey (1)
- Full Waveform Inversion (1)
- Geophysical modelling (1)
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- Gowganda Formation (1)
- Ground-motion Prediction Equations (1)
- Hazard estimators (1)
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- Huronian Supergroup (1)
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- Moment Magnitude (1)
- Nechalacho (1)
- Paleoproterozoic (1)
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- Rhythmites (1)
- Seismic Wave Modelling (1)
- ShakeMap Parameters (1)
- Site Effects (1)
- Site Fundamental Frequency (1)
- Social sensors (1)
- Stream computing (1)
- Stress Parameter (1)
- Thor Lake (1)
- Tilted Transverse Isotropy (1)
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Articles 1 - 5 of 5
Full-Text Articles in Geophysics and Seismology
The Application Of Geophysical Inversion Techniques To The Nechalacho Rare Earth Element Deposit, Nt, Derek W. Kouhi
The Application Of Geophysical Inversion Techniques To The Nechalacho Rare Earth Element Deposit, Nt, Derek W. Kouhi
Electronic Thesis and Dissertation Repository
The Nechalacho deposit is a world-class rare earth element deposit located in the Thor Lake region approximately 100 kilometers southwest of Yellowknife, NT, Canada. Located within the Blatchford Lake Intrusion Complex, this deposit has the potential to be a large-scale economic asset due to its relatively shallow and sub-horizontal geometry. In this study, geophysical inversion techniques are used to model subsurface magnetic susceptibility and density in order to delineate the deposit. Isolated and joint inversion of both magnetic and gravity data provides similar models. Each inversion procedure delineates a shallow, sub-horizontal layer of high susceptibility and density in approximately the …
Using Physical And Social Sensors In Real-Time Data Streaming For Natural Hazard Monitoring And Response, Yelena Kropivnitskaya
Using Physical And Social Sensors In Real-Time Data Streaming For Natural Hazard Monitoring And Response, Yelena Kropivnitskaya
Electronic Thesis and Dissertation Repository
Technological breakthroughs in computing over the last few decades have resulted in important advances in natural hazards analysis. In particular, integration of a wide variety of information sources, including observations from spatially-referenced physical sensors and new social media sources, enables better estimates of real-time hazard. The main goal of this work is to utilize innovative streaming algorithms for improved real-time seismic hazard analysis by integrating different data sources and processing tools into cloud applications. In streaming algorithms, a sequence of items from physical and social sensors can be processed in as little as one pass with no need to store …
Anisotropic Waveform Tomography: Application To Crosshole Data For Transversely Isotropic Media, Shaun Michael Hadden
Anisotropic Waveform Tomography: Application To Crosshole Data For Transversely Isotropic Media, Shaun Michael Hadden
Electronic Thesis and Dissertation Repository
Anisotropic Traveltime Tomography and Full Waveform Inversion were applied first to synthetic and then to real data following the development of a transversely isotropic model for handling anisotropy. Best-fitting models of seismic velocity and Thomsen's anisotropy parameters were initially obtained from traveltime tomography, and then used as the starting models for Full Waveform Inversion. The use of a Laplace transform approach effectively damps late arriving S-wave artifacts that introduce errors into the modelling process. The results of the synthetic study highlights the tradeoffs in resolution between the two parameter classes, but verify anisotropic traveltime tomography as a valid method for …
Ground-Motion Prediction Equations For Central And Eastern North America, With Emphasis On Site Effects, Behzad Hassani
Ground-Motion Prediction Equations For Central And Eastern North America, With Emphasis On Site Effects, Behzad Hassani
Electronic Thesis and Dissertation Repository
The works presented in this thesis are aimed at understanding and modeling earthquake ground motions in central and eastern North America (CENA), with an emphasis on the modeling of site effects. A number of approaches are taken, beginning with analysing of the observed ground-motion amplitudes with respect to a ground-motion prediction equation model (GMPE) of a well recorded region (California) (referenced empirical approach). In this work, we show that the ground-motion amplitudes of CENA earthquakes are very similar to the equivalent California values of Boore et al. (2014; BSSA14) at close distances, at low to moderate frequencies. At regional distances …
Climatic Cycles Recorded In Glacially Influenced Rhythmites Of The Gowganda Formation, Huronian Supergroup, Tim S. Howe, Patricia L. Corcoran, Fred Longstaffe, Elizabeth A. Webb, R Gerhard Pratt
Climatic Cycles Recorded In Glacially Influenced Rhythmites Of The Gowganda Formation, Huronian Supergroup, Tim S. Howe, Patricia L. Corcoran, Fred Longstaffe, Elizabeth A. Webb, R Gerhard Pratt
Earth Sciences Publications
The Gowganda Formation of the 2.45–2.2 Ga Huronian Supergroup contains glacially-induced, varve-like rhythmites that potentially preserve a detailed record of climatic conditions during the Paleoproterozoic Era. Four rhythmic couplet thickness records were measured at two outcrops near Wharncliffe, Ontario for the purpose of time-series analysis. The couplets, which range from 1 to 32 mm thick, are composed of alternating layers of siltstone and claystone. Time-series analysis of the couplet thickness records using the MTM Toolkit of Mann and Lees (1996) consistently revealed periodicities in the range of 2.2–2.9 couplets per cycle, which is consistent with climatic cycles such as the …