Steve T. Sahetapy-Engel

University of Hawaiʻi at Mānoa

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Co-Authors

Andrew Harris

Centre National de la Recherche Scientifique

William I. Rose

Michigan Technological University

Luke P. Flynn

University of Hawaii System

G. J. Bluth

Michigan Technological University

O. Matías

National Institute for Seismology, Vulcanology, Meteorology and Hydrology

I. A. Nairn

GNS Science

Emanuele Marchetti

University of Florence

Stephen Self

Planetary Science Institute

Ceinwen Scutter

Monash University

Rüdiger Escobar Wolf

Michigan Technological University

Cooperative Institutions

University of Hawaiʻi at Mānoa

University of Hawaii System

Michigan Technological University

University of California, Berkeley

Yale University

Centre National de la Recherche Scientifique

Planetary Science Institute

The Open University

Laboratoire Magmas et Volcans

Université Clermont Auvergne

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Thermal-image-derived dynamics of vertical ash plumes at Santiaguito volcano, Guatemala

Bulletin of Volcanology (2009)

Steve T. Sahetapy-Engel Andrew J. Harris

Panache

10.1007/s00445-009-0284-8

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Citations (33)

Thermal structure and heat loss at the summit crater of an active lava dome

Bulletin of Volcanology (2008)

Steve T. Sahetapy-Engel Andrew Harris

Annulus (botany)

Dome (geology)

Lava dome

10.1007/s00445-008-0204-3

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Citations (36)

Thermal, seismic and infrasound observations of persistent explosive activity and conduit dynamics at Santiaguito lava dome, Guatemala

Journal of Volcanology and Geothermal Research (2008)

Steve T. Sahetapy-Engel Andrew Harris Emanuele Marchetti

Lava dome

Electrical conduit

10.1016/j.jvolgeores.2007.11.026

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Citations (61)

Deposition and generation of multiple widespread fall units from the c. AD 1314 Kaharoa rhyolitic eruption, Tarawera, New Zealand

Bulletin of Volcanology (2014)

Steve T. Sahetapy-Engel Stephen Self Rebecca Carey I. A. Nairn

Lapilli

Peléan eruption

Volcanic ash

Pumice

Dense-rock equivalent

Deposition

10.1007/s00445-014-0836-4

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Citations (17)

Explosion dynamics of pyroclastic eruptions at Santiaguito Volcano

Geophysical Research Letters (2004)

J. B. Johnson Andrew Harris Steve T. Sahetapy-Engel R. P. Escobar Wolf William I. Rose

In Jan. 2003 we monitored explosions at Santiaguito Volcano (Guatemala) with thermal, infrasonic, and seismic sensors. Thermal data from 2 infrared thermometers allowed computation of plume rise speeds, which ranged from 8 to 20 m/s. Rise rates correlated with cumulative thermal radiance, indicating that faster rising plumes correspond to explosions with greater thermal flux. The relationship between rise speeds and elastic energy is less clear. Seismic radiation may not scale well with thermal output and/or rise speed because some of the thermal component may be associated with passive degassing, which does not induce significant seismicity. But non‐impulsive gas release is still able to produce a high thermal flux, which is the primary control on buoyant rise speed.

Fumarole

Thermal energy

Strombolian eruption

10.1029/2003gl019079

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Citations (43)

Continuous Monitoring of Periodic Eruptive Cycles at Santiaguito Dome Complex, Guatemala

AGUFM (2002)

Steve T. Sahetapy-Engel Luke P. Flynn Andrew Harris G. J. Bluth J. M. Byman

Dome (geology)

Source

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Surface temperature and spectral measurements at Santiaguito lava dome, Guatemala

Geophysical Research Letters (2004)

Steve T. Sahetapy-Engel Luke P. Flynn Andrew Harris G. J. Bluth William I. Rose

An infrared thermometer, spectroradiometer and digital video camera were used to observe and document short‐term evolution of surface brightness temperature and morphology at Santiaguito lava dome, Guatemala. The thermometer dataset shows 40–70 minute‐long cooling cycles, each defined by a cooling curve that is both initiated and terminated by rapid increases in temperature due to regular ash venting. The average cooling rate calculated for each cycle range from 0.9 to 1.6°C/min. We applied a two‐component thermal mixture model to the spectroradiometer (0.4–2.5 μm) dataset. The results suggest that the observed surface morphology changed from a cool (120–250°C) crust‐dominated surface with high temperature fractures (>900°C) in the first segment of the measurement period to an isothermal surface at moderately high temperature (350–500°C) during the second segment. We attribute the change in the thermal state of the surface to the physical rearrangement of the dome's surface during the most energetic of the ash eruptions.

Dome (geology)

Isothermal process

Thermometer

Lava dome

Spectroradiometer

Moderate-resolution imaging spectroradiometer

10.1029/2004gl020683

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Citations (16)

Products of the complex, long duration, AD 1305 rhyolitic eruption of Tarawera, New Zealand

AGU Fall Meeting Abstracts (2001)

S. Self Ceinwen Scutter I. A. Nairn Steve T. Sahetapy-Engel

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