caa a22 4500 477047610 CHVBK 20180405111334.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00876495 doi (NATIONALLICENCE)springer-10.1007/BF00876495 Mt. Melbourne volcano, antarctica: Evidence of seismicity related to volcanic activity [Elektronische Daten] [Salvatore Gambino, Eugenio Privitera] Characterization of the microseismic activity (M L <2.0) has been performed at Mt. Melbourne since 1990. We recorded a group of low frequency events with common morphological characteristics, i.e., an emerging onset, an unclear second phase and a sharply dropping coda. Spectral analysis of events recorded at more than one station indicates that the seismogram characteristics and spectral content are largely due to source effects. A polarization filter applied to a set of three component data revealed a first phase made up ofP waves followed (after about 0.9-1.4 sec.) by a second phase probably composed ofSH-type waves. Particle motion analysis detected a seismic ray angle direction mainly between N70°E and N110°E and apparent angle of incidence between 35° and 48° for the first phase. The studied seismicity was localized in an area on the eastern slope of Mt. Melbourne Volcano which presents a surface temperature anomaly (Mazzarini andSalvini, 1994). We formulate two hypotheses for the type of earthquakes recorded: 1) long-period events involving active presence of magmatic fluids in the source processes; 2) or the result of fracturing processes (shear?) in a medium characterized by transition between brittle and plastic behaviors. In the latter hypothesis the superficial thermal anomaly may be a symptom of this behavior at depth and is confirmed by the lown values observed for the exponential fit in the codaQ analysis. Birkhäuser Verlag, 1996 Volcanic seismicity nationallicence polarization analysis nationallicence Q nationallicence volcanic processes nationallicence Gambino Salvatore Istituto Internazionale di Vulcanologica, CNR, Piazza Roma 2, 95123, Catania, Italy aut Privitera Eugenio Istituto Internazionale di Vulcanologica, CNR, Piazza Roma 2, 95123, Catania, Italy aut pure and applied geophysics Birkhäuser-Verlag 146/2(1996-03-01), 305-318 0033-4553 146:2<305 1996 146 24 https://doi.org/10.1007/BF00876495 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00876495 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gambino Salvatore Istituto Internazionale di Vulcanologica, CNR, Piazza Roma 2, 95123, Catania, Italy aut NATIONALLICENCE 700 1- Privitera Eugenio Istituto Internazionale di Vulcanologica, CNR, Piazza Roma 2, 95123, Catania, Italy aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 146/2(1996-03-01), 305-318 0033-4553 146:2<305 1996 146 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer