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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Bibliographic Details
Main Author: Rohlof,Kent J.
Other Authors: AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
Format: Text
Language:English
Published: 1969
Subjects:
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
Nunivak
Nunivak Island
Alaska
Online Access:http://www.dtic.mil/docs/citations/AD0694067
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0694067
Description
Summary: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)

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