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Your search keyword '"Minson, S. E."' showing total 14 results
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14 results on '"Minson, S. E."'

3. A Probabilistic Approach to Remote Compositional Analysis of Planetary Surfaces

Author

Lapotre, M. G. A., Ehlmann, B. L., and Minson, S. E.

Abstract

Reflected light from planetary surfaces provides information, including mineral/ice compositions and grain sizes, by study of albedo and absorption features as a function of wavelength. However, deconvolving the compositional signal in spectra is complicated by the nonuniqueness of the inverse problem. Trade-offs between mineral abundances and grain sizes in setting reflectance, instrument noise, and systematic errors in the forward model are potential sources of uncertainty, which are often unquantified. Here we adopt a Bayesian implementation of the Hapke model to determine sets of acceptable-fit mineral assemblages, as opposed to single best fit solutions. We quantify errors and uncertainties in mineral abundances and grain sizes that arise from instrument noise, compositional end members, optical constants, and systematic forward model errors for two suites of ternary mixtures (olivine-enstatite-anorthite and olivine-nontronite-basaltic glass) in a series of six experiments in the visible-shortwave infrared (VSWIR) wavelength range. We show that grain sizes are generally poorly constrained from VSWIR spectroscopy. Abundance and grain size trade-offs lead to typical abundance errors of ≤1 wt % (occasionally up to ~5 wt %), while ~3% noise in the data increases errors by up to ~2 wt %. Systematic errors further increase inaccuracies by a factor of 4. Finally, phases with low spectral contrast or inaccurate optical constants can further increase errors. Overall, typical errors in abundance are

Published
2017

12. The 2011 Magnitude 9.0 Tohoku-Oki Earthquake: Mosaicking the Megathrust from Seconds to Centuries

Author

Simons, M., primary, Minson, S. E., additional, Sladen, A., additional, Ortega, F., additional, Jiang, J., additional, Owen, S. E., additional, Meng, L., additional, Ampuero, J.-P., additional, Wei, S., additional, Chu, R., additional, Helmberger, D. V., additional, Kanamori, H., additional, Hetland, E., additional, Moore, A. W., additional, and Webb, F. H., additional

Published
2011
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14. The 2013 Mw 7.7 Balochistan Earthquake: Seismic Potential of an Accretionary Wedge.

Author

Jolivet, R., Duputel, Z., Riel, B., Simons, M., Rivera, L., Minson, S. E., Zhang, H., Aivazis, M. A. G., Ayoub, F., Leprince, S., Samsonov, S., Motagh, M., and Fielding, E. J.

Subjects
PAKISTAN Earthquake, 2008, EARTHQUAKES, EARTH movements, GEOLOGY, SEISMOLOGY, EARTHQUAKE aftershocks
Abstract

Great earthquakes rarely occur within active accretionary prisms, despite the intense long-term deformation associated with the formation of these geologic structures. This paucity of earthquakes is often attributed to partitioning of deforma-tion across multiple structures as well as aseismic deformation within and at the base of the prism (Davis et ai, 1983). We use teleseismic data and satellite optical and radar imaging of the 2013 Mw 7.7 earthquake that occurred on the southeastern edge of the Makran plate boundary zone to study this unexpected earthquake. We first compute a multiple point-source solution from VK-phase waveforms to estimate fault geometry and rupture duration and timing. We then derive the distribution of subsurface fault slip from geodetic coseismic offsets. We sample for the slip posterior probability den-sity function using a Bayesian approach, including a full description of the data covariance and accounting for errors in the elastic structure of the crust. The rupture nucleated on a subvertical segment, branching out of the Chaman fault system, and grew into a major earthquake along a 50° north-dipping thrust fault with significant along-strike curvature. Fault slip propagated at an average speed of 3.0 km/s for about 180 km and is concentrated in the top 10 km with no displacement on the underlying décollement. This earthquake does not exhibit significant slip deficit near the surface, nor is there significant segmentation of the rupture. We propose that complex inter-action between the subduction accommodating the Arabia-Eurasia convergence to the south and the Ornach Nal fault plate boundary between India and Eurasia resulted in the significant strain gradient observed prior to this earthquake. Convergence in this region is accommodated both along the subduction megathrust and as internal defor-mation of the accretionary wedge. [ABSTRACT FROM AUTHOR]

Published
2014
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