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Bulletin of the Seismological Society of America; October 1998; v. 88; no. 5; p. 1099-1111
© 1998 Seismological Society of America
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Bayesian statistics applied to the location of the source of explosions at Stromboli Volcano, Italy

Gilberto Saccorotti, Bernard Chouet, Marcello Martini and Roberto Scarpa

Dipartimento di Geofisica e Vulcanologia Università di Napoli "Federico II", Largo San Marcelino 10, 80138 Napoli, Italy
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025
Osservatorio Vesuviano, Via Manzoni 249, 80123 Napoli, Italy
Dipartimento di Fisica Università degli Studi dell'Aquila, 67010 Coppito, L'Aquila, Italy

Abstract

We present a method for determining the location and spatial extent of the source of explosions at Stromboli Volcano, Italy, based on a Bayesian inversion of the slowness vector derived from frequency-slowness analyses of array data. The method searches for source locations that minimize the error between the expected and observed slowness vectors. For a given set of model parameters, the conditional probability density function of slowness vectors is approximated by a Gaussian distribution of expected errors. The method is tested with synthetics using a five-layer velocity model derived for the north flank of Stromboli and a smoothed velocity model derived from a power-law approximation of the layered structure. Application to data from Stromboli allows for a detailed examination of uncertainties in source location due to experimental errors and incomplete knowledge of the Earth model. Although the solutions are not constrained in the radial direction, excellent resolution is achieved in both transverse and depth directions. Under the assumption that the horizontal extent of the source does not exceed the crater dimension, the 90% confidence region in the estimate of the explosive source location corresponds to a small volume extending from a depth of about 100 m to a maximum depth of about 300 m beneath the active vents, with a maximum likelihood source region located in the 120- to 180-m-depth interval.




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