Please use this identifier to cite or link to this item:
|Authors: ||Braun, T.*|
|Title: ||Interaction of seismic and airwaves recorded at Stromboli volcano|
|Title of journal: ||Geophysical Research Letters|
|Series/Report no.: ||/ 20(1993)|
|Publisher: ||American Geophysical Union|
|Issue Date: ||1993|
|Keywords: ||volcano seismology|
|Abstract: ||Explosion-quake seismograms recorded at Stromboli show that seismic phases with a high-amplitude and high-frequency content propagate with a velocity of approximately 330 m/s - the sound speed. The analysis of seismograms, recorded at a distance of 500 m from one of the three active vents, shows for the first onset a low frequency and particle motion characteristics of a p-wave, which loses its longitudinal polarization with the onset of the air-wave.
Recording the explosion-quake simultaneously with a microphonewe would ascertain that the high frequency onset coincides with the air-wave's. In order to better understand the seismic wavefield generated by the atmospheric pressure, we performed a controlled source experiment at Stromboli using a seismic gun. Seismograms with the same two phases and particle motions comparable with the volcanic seismic data were obtained. A second experiment demonstrated, that the air-wave propagates at least in the uppermost 1m of the gound. We suggest that the seismic source of the corresponding seismograms is an explosion at the top of the magma column and conclude that the p- and air-waves are both generated in the same point and at the same time.|
|Appears in Collections:||Papers Published / Papers in press|
04.06.08. Volcano seismology
Files in This Item:
|1993GRL_TB&Ripepe_airwave.pdf||3.59 MB||Adobe PDF||View/Open
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.