J
John W. Ewert
Researcher at United States Geological Survey
Publications - 28
Citations - 1295
John W. Ewert is an academic researcher from United States Geological Survey. The author has contributed to research in topics: Volcano & Volcanic hazards. The author has an hindex of 14, co-authored 27 publications receiving 1142 citations.
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Journal ArticleDOI
A multidisciplinary effort to assign realistic source parameters to models of volcanic ash-cloud transport and dispersion during eruptions
Larry G. Mastin,Marianne Guffanti,René Servranckx,Peter Webley,Sara Barsotti,Kenneson G. Dean,Adam J. Durant,John W. Ewert,Augusto Neri,William I. Rose,David J. Schneider,Lee Siebert,Barbara J. B. Stunder,G. Swanson,Andrew Tupper,A. Volentik,Christopher F. Waythomas +16 more
TL;DR: In this paper, a group effort to improve the accuracy of source parameters used by VATDs in the early hours of an eruption was reported, by compiling a list of eruptions for which these parameters are well constrained, and then using these data to review and update previously studied parameter relationships.
Journal ArticleDOI
Gas emissions and the eruptions of mount st. Helens through 1982.
Thomas J. Casadevall,William I. Rose,Terrence M. Gerlach,L. P. Greenland,John W. Ewert,R Wunderman,Robert B. Symonds +6 more
TL;DR: The emission rates of sulfur dioxide and carbon dioxide were at their peak during July and August 1980, decreased rapidly in late 1980, and have remained low and decreased slightly through 1981 and 1982, suggesting steady outgassing of a single batch of magma.
OtherDOI
An assessment of volcanic threat and monitoring capabilities in the United States: Framework for a National Volcano Early Warning System
Journal ArticleDOI
The Unexpected Awakening of Chaitén Volcano, Chile
Simon Carn,John S. Pallister,Luis E. Lara,John W. Ewert,Sebastian F. L. Watt,Alfred J Prata,Ronald J. Thomas,Gustavo Villarosa +7 more
TL;DR: Chaiten volcano in Chile's southern volcanic zone was the first major rhyolitic eruption since that of Alaska’s Katmai-Novarupta in 1912 as mentioned in this paper.
Journal ArticleDOI
Volcanic-ash hazard to aviation during the 2003–2004 eruptive activity of Anatahan volcano, Commonwealth of the Northern Mariana Islands
TL;DR: The 2003-2004 eruptive activity of Anatahan volcano affected the region's aviation operations for 3 days in May 2003 as mentioned in this paper, and two international flights from Saipan to Japan were cancelled, and several flights implemented ash-avoidance procedures.