Abstract
Dense arrays of three-component seismographs have been maintained in the Travale geothermal field during two periods of several weeks. The particular array configuration (20 stations on a 3 × 3 km area) was intended to allow a high horizontal resolution investigation of the field itself, by analysis of steep-incidence waves. Natural and artificial sources at 100 km distances provided phases reflected by deep crustal interfaces, from which differential attenuation factor estimates are obtained. Consequent signatures of the area around and within the productive field are discussed, with respect also to laboratory measurements on porous, fluid-filled rock samples.
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