ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA.
Nanwaksjiak Crater, a quaternary maar on Nunivak Island, Alaska, has a well-exposed ejecta blanket of ash and blocks ejected from the crater. Analysis of the distributions of the blocks provides clues to the internal flow conditions of the eruption. Methods of ballistics are applied to field data to...
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ftdtic:AD0694067 2023-05-15T17:48:12+02:00 ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. Rohlof,Kent J. AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING 1969-06 text/html http://www.dtic.mil/docs/citations/AD0694067 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0694067 en eng http://www.dtic.mil/docs/citations/AD0694067 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geology Geochemistry and Mineralogy Explosions Ballistics (*VOLCANOES EXPLOSIONS) (*PROJECTILES PROJECTILE TRAJECTORIES) EXTERIOR BALLISTICS EJECTION AERODYNAMIC CHARACTERISTICS VELOCITY BASALT DRAG ANGLE OF ATTACK WIND MATHEMATICAL MODELS THESES DENSITY ALASKA VOLCANIC ERUPTIONS VOLCANIC EJECTA Text 1969 ftdtic 2016-02-18T22:24:34Z Nanwaksjiak Crater, a quaternary maar on Nunivak Island, Alaska, has a well-exposed ejecta blanket of ash and blocks ejected from the crater. Analysis of the distributions of the blocks provides clues to the internal flow conditions of the eruption. Methods of ballistics are applied to field data to determine block ejection velocities. Effects of atmospheric drag, block shape, launch angles, and wind on ballistic trajectories are discussed. Graphs are presented to allow determination of ejection velocities if size, launch angle, and range of the blocks are known. Block velocities are applied to two models for the interior flow in erupting maars to estimate flow parameters of the erupting medium. (Author) Text Nunivak Nunivak Island Alaska Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geology Geochemistry and Mineralogy Explosions Ballistics (*VOLCANOES EXPLOSIONS) (*PROJECTILES PROJECTILE TRAJECTORIES) EXTERIOR BALLISTICS EJECTION AERODYNAMIC CHARACTERISTICS VELOCITY BASALT DRAG ANGLE OF ATTACK WIND MATHEMATICAL MODELS THESES DENSITY ALASKA VOLCANIC ERUPTIONS VOLCANIC EJECTA |
spellingShingle |
Geology Geochemistry and Mineralogy Explosions Ballistics (*VOLCANOES EXPLOSIONS) (*PROJECTILES PROJECTILE TRAJECTORIES) EXTERIOR BALLISTICS EJECTION AERODYNAMIC CHARACTERISTICS VELOCITY BASALT DRAG ANGLE OF ATTACK WIND MATHEMATICAL MODELS THESES DENSITY ALASKA VOLCANIC ERUPTIONS VOLCANIC EJECTA Rohlof,Kent J. ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
topic_facet |
Geology Geochemistry and Mineralogy Explosions Ballistics (*VOLCANOES EXPLOSIONS) (*PROJECTILES PROJECTILE TRAJECTORIES) EXTERIOR BALLISTICS EJECTION AERODYNAMIC CHARACTERISTICS VELOCITY BASALT DRAG ANGLE OF ATTACK WIND MATHEMATICAL MODELS THESES DENSITY ALASKA VOLCANIC ERUPTIONS VOLCANIC EJECTA |
description |
Nanwaksjiak Crater, a quaternary maar on Nunivak Island, Alaska, has a well-exposed ejecta blanket of ash and blocks ejected from the crater. Analysis of the distributions of the blocks provides clues to the internal flow conditions of the eruption. Methods of ballistics are applied to field data to determine block ejection velocities. Effects of atmospheric drag, block shape, launch angles, and wind on ballistic trajectories are discussed. Graphs are presented to allow determination of ejection velocities if size, launch angle, and range of the blocks are known. Block velocities are applied to two models for the interior flow in erupting maars to estimate flow parameters of the erupting medium. (Author) |
author2 |
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING |
format |
Text |
author |
Rohlof,Kent J. |
author_facet |
Rohlof,Kent J. |
author_sort |
Rohlof,Kent J. |
title |
ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
title_short |
ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
title_full |
ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
title_fullStr |
ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
title_full_unstemmed |
ANALYSIS OF THE EXTERIOR BALLISTICS OF BLOCK EJECTA AT NANWAKSJIAK CRATER, NUNIVAK ISLAND, ALASKA. |
title_sort |
analysis of the exterior ballistics of block ejecta at nanwaksjiak crater, nunivak island, alaska. |
publishDate |
1969 |
url |
http://www.dtic.mil/docs/citations/AD0694067 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0694067 |
genre |
Nunivak Nunivak Island Alaska |
genre_facet |
Nunivak Nunivak Island Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0694067 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766153454624964608 |