TY - JOUR
T1 - An unusually energetic basaltic phreatomagmatic eruption
T2 - Using deposit characteristics to constrain dilute pyroclastic density current dynamics
AU - Brand, Brittany D.
AU - Clarke, Amanda
PY - 2012/10/15
Y1 - 2012/10/15
N2 - Multiple, highly erosive base surges of the Table Rock Complex tuff ring (TRC2), Oregon, produced dune-bedded deposits with crest to crest bedform wavelengths up to 200m, which are amongst the largest ever recognized in the deposits of pyroclastic density currents. Here we use bedform wavelength, surmounted obstacles, and a large chute-and-pool feature to estimate near-source velocities (118-233ms -1), lower-bound velocities at radial distances of 1.6, 2 and 4.7km from source (34, 29 and 20ms -1, respectively), and corresponding column collapse heights (up to 2.8km). This paper represents one of the few studies that attempt to quantify flow characteristics, such as emplacement velocities at different distances from source, eruption column collapse height, and eruptive energy, based on deposit characteristics.
AB - Multiple, highly erosive base surges of the Table Rock Complex tuff ring (TRC2), Oregon, produced dune-bedded deposits with crest to crest bedform wavelengths up to 200m, which are amongst the largest ever recognized in the deposits of pyroclastic density currents. Here we use bedform wavelength, surmounted obstacles, and a large chute-and-pool feature to estimate near-source velocities (118-233ms -1), lower-bound velocities at radial distances of 1.6, 2 and 4.7km from source (34, 29 and 20ms -1, respectively), and corresponding column collapse heights (up to 2.8km). This paper represents one of the few studies that attempt to quantify flow characteristics, such as emplacement velocities at different distances from source, eruption column collapse height, and eruptive energy, based on deposit characteristics.
KW - Base surge
KW - Explosive volcanism
KW - Maar
KW - Oregon
KW - Phreatomagmatic
KW - Pyroclastic density currents
KW - Table rock complex
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U2 - 10.1016/j.jvolgeores.2012.06.011
DO - 10.1016/j.jvolgeores.2012.06.011
M3 - Article
AN - SCOPUS:84866942990
SN - 0377-0273
VL - 243-244
SP - 81
EP - 90
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
ER -