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Remote Sens. 2017, 9(1), 4; doi:10.3390/rs9010004

Pyroclastic Flow Deposits and InSAR: Analysis of Long-Term Subsidence at Augustine Volcano, Alaska

1
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
2
Alaska Satellite Facility, Fairbanks, AK 99775, USA
3
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
4
Alaska Volcano Observatory, Fairbanks, AK 99775, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Andrew McGonigle, Richard Gloaguen and Prasad S. Thenkabail
Received: 23 September 2016 / Revised: 4 December 2016 / Accepted: 14 December 2016 / Published: 24 December 2016
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Abstract

Deformation of pyroclastic flow deposits begins almost immediately after emplacement, and continues thereafter for months or years. This study analyzes the extent, volume, thickness, and variability in pyroclastic flow deposits (PFDs) on Augustine Volcano from measuring their deformation rates with interferometric synthetic aperture radar (InSAR). To conduct this analysis, we obtained 48 SAR images of Augustine Volcano acquired between 1992 and 2010, spanning its most recent eruption in 2006. The data were processed using d-InSAR time-series analysis to measure the thickness of the Augustine PFDs, as well as their surface deformation behavior. Because much of the 2006 PFDs overlie those from the previous eruption in 1986, geophysical models were derived to decompose deformation contributions from the 1986 deposits underlying the measured 2006 deposits. To accomplish this, we introduce an inversion approach to estimate geophysical parameters for both 1986 and 2006 PFDs. Our analyses estimate the expanded volume of pyroclastic flow material deposited during the 2006 eruption to be 3.3 × 107 m3 ± 0.11 × 107 m3, and that PFDs in the northeastern part of Augustine Island reached a maximum thickness of ~31 m with a mean of ~5 m. Similarly, we estimate the expanded volume of PFDs from the 1986 eruption at 4.6 × 107 m3 ± 0.62 × 107 m3, with a maximum thickness of ~31 m, and a mean of ~7 m. View Full-Text
Keywords: InSAR; volcano; Augustine; pyroclastic flows; deposits; inversion InSAR; volcano; Augustine; pyroclastic flows; deposits; inversion
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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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MDPI and ACS Style

McAlpin, D.B.; Meyer, F.J.; Gong, W.; Beget, J.E.; Webley, P.W. Pyroclastic Flow Deposits and InSAR: Analysis of Long-Term Subsidence at Augustine Volcano, Alaska. Remote Sens. 2017, 9, 4.

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