GPR Imaging of Pyroclastic Density Current Deposits at Mount St. Helens, Washington

Andrew Gase

doi:10.1190/nsapc2015-033

GPR Imaging of Pyroclastic Density Current Deposits at Mount St. Helens, Washington

Andrew Gase

Boise State University

Research output: Contribution to journal › Conference article › peer-review

Abstract

Ground penetrating radar (GPR) is used to image pyroclastic density current (PDC) deposits from the May 18th, 1980 eruption of Mount St. Helens. Outcrop verified features include a scour-and-fill channel and a secondary phreatic explosion crater. Unverified reflectors are attributed to either depositional levees or debris avalanche hummocks. This preliminary study validates that GPR can be used to identify and map the three-dimensional structure of pyroclastic deposits, which increases our ability to develop robust interpretations of the mechanisms and conditions of emplacement. Future work is proposed to continue field investigation with high density common midpoint stacking methods, tomographic velocity inversion, and seismic methods to improve our ability to distinguish between deposits with density, sorting, porosity, and radarfacies.

Original language	American English
Pages (from-to)	127-131
Number of pages	5
Journal	2nd Near Surface Asia Pacific Conference
DOIs	https://doi.org/10.1190/nsapc2015-033
State	Published - Jul 2015
Event	Near-Surface Asia Pacific Conference, Waikoloa, Hawaii, 7-10 July 2015 - Hawaii, Waikoloa, United States Duration: 7 Jul 2015 → 10 Jul 2015 https://library.seg.org/doi/book/10.1190/NSAPC2015

Keywords

GPR
density
pyroclastic

EGS Disciplines

Volcanology

Access to Document

10.1190/nsapc2015-033License: Unspecified

Cite this

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title = "GPR Imaging of Pyroclastic Density Current Deposits at Mount St. Helens, Washington",

abstract = "Ground penetrating radar (GPR) is used to image pyroclastic density current (PDC) deposits from the May 18th, 1980 eruption of Mount St. Helens. Outcrop verified features include a scour-and-fill channel and a secondary phreatic explosion crater. Unverified reflectors are attributed to either depositional levees or debris avalanche hummocks. This preliminary study validates that GPR can be used to identify and map the three-dimensional structure of pyroclastic deposits, which increases our ability to develop robust interpretations of the mechanisms and conditions of emplacement. Future work is proposed to continue field investigation with high density common midpoint stacking methods, tomographic velocity inversion, and seismic methods to improve our ability to distinguish between deposits with density, sorting, porosity, and radarfacies.",

keywords = "GPR, density, pyroclastic",

author = "Andrew Gase",

note = "{\textcopyright} 2015 Published in electronic format with permission by the Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of Japan; Near-Surface Asia Pacific Conference, Waikoloa, Hawaii, 7-10 July 2015 ; Conference date: 07-07-2015 Through 10-07-2015",

year = "2015",

month = jul,

doi = "10.1190/nsapc2015-033",

language = "American English",

pages = "127--131",

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T1 - GPR Imaging of Pyroclastic Density Current Deposits at Mount St. Helens, Washington

AU - Gase, Andrew

N1 - © 2015 Published in electronic format with permission by the Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of Japan

PY - 2015/7

Y1 - 2015/7

N2 - Ground penetrating radar (GPR) is used to image pyroclastic density current (PDC) deposits from the May 18th, 1980 eruption of Mount St. Helens. Outcrop verified features include a scour-and-fill channel and a secondary phreatic explosion crater. Unverified reflectors are attributed to either depositional levees or debris avalanche hummocks. This preliminary study validates that GPR can be used to identify and map the three-dimensional structure of pyroclastic deposits, which increases our ability to develop robust interpretations of the mechanisms and conditions of emplacement. Future work is proposed to continue field investigation with high density common midpoint stacking methods, tomographic velocity inversion, and seismic methods to improve our ability to distinguish between deposits with density, sorting, porosity, and radarfacies.

AB - Ground penetrating radar (GPR) is used to image pyroclastic density current (PDC) deposits from the May 18th, 1980 eruption of Mount St. Helens. Outcrop verified features include a scour-and-fill channel and a secondary phreatic explosion crater. Unverified reflectors are attributed to either depositional levees or debris avalanche hummocks. This preliminary study validates that GPR can be used to identify and map the three-dimensional structure of pyroclastic deposits, which increases our ability to develop robust interpretations of the mechanisms and conditions of emplacement. Future work is proposed to continue field investigation with high density common midpoint stacking methods, tomographic velocity inversion, and seismic methods to improve our ability to distinguish between deposits with density, sorting, porosity, and radarfacies.

KW - GPR

KW - density

KW - pyroclastic

U2 - 10.1190/nsapc2015-033

DO - 10.1190/nsapc2015-033

M3 - Conference article

SN - 2159-6832

SP - 127

EP - 131

JO - 2nd Near Surface Asia Pacific Conference

JF - 2nd Near Surface Asia Pacific Conference

T2 - Near-Surface Asia Pacific Conference, Waikoloa, Hawaii, 7-10 July 2015

Y2 - 7 July 2015 through 10 July 2015

ER -

GPR Imaging of Pyroclastic Density Current Deposits at Mount St. Helens, Washington

Abstract

Keywords

EGS Disciplines

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