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Authors: Zandomeneghi, D.*
Almendros, J.*
Ibanez, J. M.*
Saccorotti, G.*
Title: Seismic tomography of Central Sao Miguel, Azores
Title of journal: Physics of the Earth and Planetary Interiors
Series/Report no.: 2/167(2008)
Publisher: Elsevier
Issue Date: Mar-2008
DOI: 10.1016/j.pepi.2008.02.005
Keywords: Seismic tomography
Volcano seismology
Crustal structure
Abstract: We determine the three-dimensional distribution of P- and S-wave velocities for Central São Miguel Island (Azores, Portugal) by tomographic inversion of local earthquake arrival times. We use P- and S-phases from 289 earthquakes recorded by a network of 20 seismometers. The model shows good resolution in the shallowest 5–6 km, as illustrated by different resolution tests. There are several velocity anomalies, interpreted as pyroclastic deposits, intrusive bodies, geothermal fields, and the effects of tectonics. A low Vp zone marks Furnas caldera, probably evidencing volcaniclastic sediments with development of intense geothermal activity. Another low Vp zone extends in correspondence of the highly fractured area between Fogo and the north coast. Conversely, strong positive anomalies are found south of Fogo and northwest of Furnas. They are interpreted in terms of high-density deposits and remnants of a plutonic intrusion. These interpretations are supported by the distribution of Vp/Vs, and are consistent with previous geological, geochemical, and geophysical data.
Appears in Collections:04.06.08. Volcano seismology
Papers Published / Papers in press

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