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Geosciences 2017, 7(4), 130; https://doi.org/10.3390/geosciences7040130

Investigating the Apparent Seismic Diffusivity of Near-Receiver Geology at Mount St. Helens Volcano, USA

1
Department of Earth Sciences, University of Turin, Via Tommaso Valperga Caluso, 35, 10125 Turin, Italy
2
School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK
3
Department of Geology and Petroleum Geology, School of Geosciences, University of Aberdeen, King’s College, Aberdeen AB24 3FX, UK
*
Author to whom correspondence should be addressed.
Received: 16 October 2017 / Revised: 27 November 2017 / Accepted: 7 December 2017 / Published: 15 December 2017
(This article belongs to the Special Issue Volcano Monitoring – Placing the Finger on the Pulse)
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Abstract

We present an expanded approach of the diffusive approximation to map strongly scattering geological structures in volcanic environments using seismic coda intensities and a diffusive approximation. Seismic data from a remarkably consistent hydrothermal source of Long-Period (LP) earthquakes, that was active during the late 2004 portion of the 2004–2008 dome building eruption of Mount St. Helens Volcano, are used to obtain coefficient values for diffusion and attenuation, and describe the rate at which seismic energy radiates into the surrounding medium. The results are then spatially plotted as a function of near-receiver geology to generate maps of near-surface geological and geophysical features. They indicate that the diffusion coefficient is a marker of the near-receiver geology, while the attenuation coefficients are sensitive to deeper volcanic structures. As previously observed by other studies, two main scattering regimes affect the coda envelopes: a diffusive, multiple-scattering regime close to the volcanic edifice and a much weaker, single-to-multiple scattering regime at higher source-receiver offsets. Within the diffusive, multiple-scattering regime, the spatial variations of the diffusion coefficient are sufficiently robust to show the features of laterally-extended, coherent, shallow geological structures. View Full-Text
Keywords: volcanology; seismic attenuation; coda waves; diffusion coefficient; near-receiver geology volcanology; seismic attenuation; coda waves; diffusion coefficient; near-receiver geology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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King, T.; Benson, P.; De Siena, L.; Vinciguerra, S. Investigating the Apparent Seismic Diffusivity of Near-Receiver Geology at Mount St. Helens Volcano, USA. Geosciences 2017, 7, 130.

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