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Titolo:
Spatial extent of a hydrothermal system at Kilauea Volcano, Hawaii, determined from array analyses of shallow long-period seismicity - 1. Method
Autore:
Almendros, J; Chouet, B; Dawson, P;
Indirizzi:
US Geol Survey, Menlo Pk, CA 94025 USA US Geol Survey Menlo Pk CA USA 94025 Geol Survey, Menlo Pk, CA 94025 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B7, volume: 106, anno: 2001,
pagine: 13565 - 13580
SICI:
0148-0227(20010710)106:B7<13565:SEOAHS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
WAVE-FIELD ANALYSIS; STROMBOLI-VOLCANO; DENSE ARRAY; LOCATION; TREMOR; EXPLOSIONS; SIGNALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Almendros, J US Geol Survey, 345 Middlefield Rd,MS 910, Menlo Pk, CA 94025USA US Geol Survey 345 Middlefield Rd,MS 910 Menlo Pk CA USA 94025
Citazione:
J. Almendros et al., "Spatial extent of a hydrothermal system at Kilauea Volcano, Hawaii, determined from array analyses of shallow long-period seismicity - 1. Method", J GEO R-SOL, 106(B7), 2001, pp. 13565-13580

Abstract

We present a probabilistic method to locate the source of seismic events using seismic antennas. The method is based on a comparison of the event azimuths and slownesses derived from frequency-slowness analyses of array data, with a slowness vector model. Several slowness vector models are considered including both homogeneous and horizontally layered half-spaces and alsoa more complex medium representing the actual topography and three-dimensional velocity structure of the region under study. In this latter model theslowness vector is obtained from frequency-slowness analyses of synthetic signals. These signals are generated using the finite difference method andinclude the effects of topography and velocity structure to reproduce as closely as possible the behavior of the observed wave fields. A comparison of these results with those obtained with a homogeneous half-space demonstrates the importance of structural and topographic effects, which, if ignored, lead to a bias in the source location. We use synthetic seismograms to test the accuracy and stability of the method and to investigate the effect of our choice of probability distributions. We conclude that this location method can provide the source position of shallow events within a complex volcanic structure such as Kilauea Volcano with an error of +/-200 m.

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Documento generato il 03/04/20 alle ore 11:07:39