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Receiver Function Analysis at Stromboli Volcano (Italy)
Author(s)
Type
Poster session
Language
English
Status
Published
Conference Name
European Geosciences Union
Issued date
April 15, 2007
Conference Location
Vienna
Keywords
Abstract
This study focuses on constraining the crust and upper mantle discontinuities at Stromboli
volcano by applying the receiver function (RF) analysis. This technique utilizes
the waveforms of P-SV conversions generated by discontinuities to infer the structure
beneath the seismic stations. RFs have been obtained by deconvolving the vertical
component of teleseismic P-wave records from the corresponding rotate horizontal
components applying the Multi-Taper Spectral Correlation technique. For this study
the seismograms of about 125 teleseismic earthquakes (M greater than 6.0), recorded
between 2004 and 2006 at 13 broad-band seismic stations deployed by the INGV, have
been considered. A preliminar characterization of the structure beneath the stations has
been inferred from the stacking of teleseismic Ps converted waves and multiply converted
waves at the seismic interface. The analysis, at frequency of 1 and 2 Hz, show
a horizontal seismic discontinuity at an average depth of about 17 km and a Vp/Vs
ratio lower than 1.73. This discontinuity explains the positive pulses about 1.9 s and
7.5 s after the direct P arrival. These pulses can be interpreted as Ps and PpPs converted
phases, respectively. The depth of this discontinuity is in agreement with the
Moho-depth obtained in independent studies.
volcano by applying the receiver function (RF) analysis. This technique utilizes
the waveforms of P-SV conversions generated by discontinuities to infer the structure
beneath the seismic stations. RFs have been obtained by deconvolving the vertical
component of teleseismic P-wave records from the corresponding rotate horizontal
components applying the Multi-Taper Spectral Correlation technique. For this study
the seismograms of about 125 teleseismic earthquakes (M greater than 6.0), recorded
between 2004 and 2006 at 13 broad-band seismic stations deployed by the INGV, have
been considered. A preliminar characterization of the structure beneath the stations has
been inferred from the stacking of teleseismic Ps converted waves and multiply converted
waves at the seismic interface. The analysis, at frequency of 1 and 2 Hz, show
a horizontal seismic discontinuity at an average depth of about 17 km and a Vp/Vs
ratio lower than 1.73. This discontinuity explains the positive pulses about 1.9 s and
7.5 s after the direct P arrival. These pulses can be interpreted as Ps and PpPs converted
phases, respectively. The depth of this discontinuity is in agreement with the
Moho-depth obtained in independent studies.
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