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Evidence for magma in the Katmai volcanic range

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Abstract

Several independent observations during the summer of 1965 suggest the presence of magma in the volcanic range of Katmai. A high value of 0.3 for Poisson’s ratio and the screening of predominantly the vertical component of the elastic shear waves have been observed. Narrow negative Bouguer anomalies possibly indicate the presence of low density material at shallow depth. The location of magma reservoirs has been attempted, using the calculated wave path and the screening of the mainly vertically polarized shear wave.

Of the possible ten chambers thus located, the ones of shallow depth (to 20 km) correspond to the location of active volcanoes. The ones between the 20 km level to the upper mantle seem to spread over a rather wide area and are not clearly related to the geographical position of a particular volcano.

Theoretical considerations on the propagation of elastic waves substantiate the observed absence of vertically polarized shear waves.

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Authors and Affiliations

  1. Geophysical Institute, University of Alaska, College, Alaska

    S. Kubota & E. Berg

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  1. S. Kubota
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  2. E. Berg
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Kubota, S., Berg, E. Evidence for magma in the Katmai volcanic range. Bull Volcanol 31, 175–214 (1967). https://doi.org/10.1007/BF02597013

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