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Ashfall dispersal for the 16 September 1986, eruption of Lascar, Chile, calculated by a turbulent diffusion model
Author(s) -
Glaze Lori S.,
Self Stephen
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl01501
Subject(s) - isopach map , biological dispersal , volcanic ash , geology , volcano , diffusion , turbulent diffusion , prevailing winds , atmospheric sciences , turbulence , geomorphology , meteorology , oceanography , geography , seismology , physics , population , demography , sociology , thermodynamics , facies , structural basin
A two dimensional model for the dispersal of volcanic ash, modified from that of Suzuki [1983], is applied to the 16 September 1986, eruption of Lascar, in northern Chile. The result is an isopach map predicting ground concentrations of ash. The map shows two local maxima along distinct dispersal axes and predicts that the deposit was detached from the source. Predicted concentrations are in agreement with a single reported thickness measurement.