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Atmospheric Pressure Changes Due to Volcanic Eruptions and Possible Water Level Fluctuations by M. B. Danard; T. S. Murty is a Environmental Science article available to read on EtoBox.

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The data of are analysed to produce the following empirical equations for the amplitude P0 (overall fluctuation) in Pascals of the air pressure wave associated with a volcanic eruption of volume Vkm ~ or a nuclear explosion of strength M Mt: logl0P0 = 4.44 + lOgl0 V-0.84 logj0 s = 3.44 + logl0 M --0.84 logl0 s. Here s is the distance from the source in kin. theory is examined on the generation of water level fluctuations by an air pressure wave crossing a water depth discontinuity such as a continental shelf. The total amplitude of the ocean wave is determined to be e = ~ + (c -c,)(: -4) where c~ = gh I , c 2 = gh 2, g is acceleration of gravity, h I and h a are the water depths on the ocean and shore side of the depth discontinuity, c is the speed of propagation of the air pressure wave, and 0 is the water density. It is calculated that a 10 km 3 eruption at Mount St. Augustine would cause a 460 Pa air pressure wave and a discernible water level fluctuation at Vancouver Island of several cm amplitude.

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Author

M. B. Danard; T. S. Murty

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0921-030X)

Published

1988

Language

EN

Field

Environmental Science (Physical Sciences)