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Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, T. J. White, Charles B. Connor, Laura J. Connor, T. Hasenaka
Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, T. J. White, Charles B. Connor, Laura J. Connor, T. Hasenaka
School of Geosciences Faculty and Staff Publications
An efficient and effective inversion and uncertainty quantification approach is proposed for estimating eruption parameters given a data set collected from a tephra deposit. The approach is model independent and here is applied using Tephra2, a code that simulates advective and dispersive tephra transport and deposition. The Levenburg‐Marquardt algorithm is combined with formal Tikhonov and subspace regularization to invert eruption parameters; a linear equation for conditional uncertainty propagation is used to estimate posterior parameter uncertainty. Both the inversion and uncertainty analysis support simultaneous analysis of the full eruption and wind field parameterization. The combined inversion/uncertainty quantification approach is applied to …
Vhub: A Knowledge Management System To Facilitate Online Collaborative Volcano Modeling And Research, José L. Palma, Leah Courtland, Sylvain J. Charbonnier, Riccardo Tortini, Greg A. Valentine
Vhub: A Knowledge Management System To Facilitate Online Collaborative Volcano Modeling And Research, José L. Palma, Leah Courtland, Sylvain J. Charbonnier, Riccardo Tortini, Greg A. Valentine
School of Geosciences Faculty and Staff Publications
Knowledge of volcanic systems and the hazards they produce is rapidly advancing as internet resources become more readily accessible, new and more sensitive field techniques are developed, and ever greater amounts of data are collected. Such rapid advances drive the need for an online collaborative knowledge management system that enables the sharing of volcanological information, and modeling and analysis tools. Vhub (http://vhub.org) is a community cyberinfrastructure platform designed for collaboration in volcanology research, education, outreach, and discovery that complements existing volcano databases and other cyberinfrastructure projects. Vhub is unique in its functionality as a nucleus for the creation …
Evidence Of Atmospheric Gravity Waves During The 2008 Eruption Of Okmok Volcano From Seismic And Remote Sensing Observations, S. De Angelis, Stephen R. Mcnutt, P. W. Webley
Evidence Of Atmospheric Gravity Waves During The 2008 Eruption Of Okmok Volcano From Seismic And Remote Sensing Observations, S. De Angelis, Stephen R. Mcnutt, P. W. Webley
School of Geosciences Faculty and Staff Publications
Okmok volcano erupted on July 12, 2008, following an 11-year hiatus. Detailed inspection of the syn-eruptive seismograms revealed the presence of an ultra long-period mode at a frequency of 1.7 mHz, which is not a characteristic of the background seismic noise at Okmok. Data collected by the National Oceanic and Atmospheric Administration Geostationary Operational Environmental Satellite (GOES) and National Aeronautical and Space Administration Moderate Resolution Imaging Spectroradiometer (MODIS) sensors displayed the propagation of a vigorous ash-and-steam plume up to about 17 km above sea level. We suggest that the observed ultra long-period signals represent the response of the seismometer to …