%0 Journal Article
%T Atmospheric pressure changes due to volcanic eruptions and possible water level fluctuations
%J Natural hazards
%D 1988
%A Danard, M. B.
%A Murty, T. S.
%V 1
%N 1
%P 15-26
%X The data of Reed (1983) are analysed to produce the following empirical equations for the amplitude p 0 (overall fluctuation) in Pascals of the air pressure wave associated with a volcanic eruption of volume V km3 or a nuclear explosion of strength M Mt: Here s is the distance from the source in km. $$begin{gathered} log _{10} p_0 = 4.44 + log _{10} V - 0.84log _{10} s hfill \ {text{ }} = 3.44 + log _{10} M - 0.84log _{10} s. hfill \ end{gathered} $$ Garrett's (1970) 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 where c 2 1 = gh 1, c 2 2 = gh 2, g is acceleration of gravity, h 1 and h 2 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 ϱ is the water density. $$B = left[ {frac{{c_2^2 }}{{c^2 - c_2^2 }} + frac{{c^2 (c_1 - c_2 )}}{{(c - c_1 )(c^2 - c_2^2 )}}} right]frac{{p_0 }}{{gvarrho }}$$ It is calculated that a 10 km3 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.<p /><p>Language: en</p>
%G en
%I Holtzbrinck Springer Nature Publishing Group
%@ 0921-030X
%U http://dx.doi.org/10.1007/BF00168219