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Full-Text Articles in Geophysics and Seismology
Examining Κ, The High Frequency Spectral Decay Parameter, In Eastern Canada, Samantha M. Palmer
Examining Κ, The High Frequency Spectral Decay Parameter, In Eastern Canada, Samantha M. Palmer
Electronic Thesis and Dissertation Repository
This thesis examines the ground motion modeling parameter kappa (κ) in the stable continental region of eastern Canada. Kappa characterizes the decay of spectral amplitudes at high frequencies due to near-surface material de-amplification and is important in seismic hazard assessments. Kappa has significant economic and seismic safety implications for critical infrastructure such as nuclear power plants and dams.
To examine kappa in eastern Canada, a database of ground motions to analyze near-source ground motion characteristics is developed. The database consists of ground motion records from 3357 earthquakes of moment magnitude (M) ≥1.5 recorded within 150 km of 25 …
Relationships Between Earthquake Ground Motions And Modified Mercalli Intensity, Andrea Sweny
Relationships Between Earthquake Ground Motions And Modified Mercalli Intensity, Andrea Sweny
Electronic Thesis and Dissertation Repository
With widespread Internet use, web-based earthquake reports are a valuable source of felt intensitydata with broad geographical coverage. Paired with ground motion data, Internet surveys like theUSGS Did You Feel It? (DYFI) website can be used to derive relationships between ground motionparameters and Modified Mercalli Intensity (MMI). These are particularly important for regionswith sparse seismographic coverage where the quality and density of intensity data may be superiorto ground motion data. MMI-ground motion relationships are also needed to infer ground motionsof historical earthquakes.
Using well-documented earthquakes in across North America, we analyze correlations betweenfelt intensity and ground motions, including peak ground …