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Authors: Rovelli, A.*
Vuan, A.*
Mele, G.*
Priolo, E.*
Boschi, E.*
Title: Rarely observed short-period (5-10 s) suboceanic Rayleigh waves propagating across the Tyrrhenian Sea
Title of journal: Geophys. Res. Lett.
Series/Report no.: /31 (2004)
Publisher: AGU
Issue Date: 2004
DOI: 10.1029/2004GL021194
Keywords: suboceanic Rayleigh waves
Abstract: Shallow earthquakes occurring in the southern part of the Tyrrhenian basin excite a long-duration low-frequency coda that propagates efficiently along paths crossing the Tyrrhenian Sea. Seismograms recorded at regional distances in the Italian peninsula are analysed in the frequency-time domain and compared with synthetics computed in simple vertically varying media. Based on results of our modeling, we interpret the coda as short-period (5-10 s) suboceanic Rayleigh waves. Their large amplitude and long duration, that we emphasize here, are explained as due to the influence of the Tyrrhenian water layer over a fast seafloor with little S-wave attenuation (QS> 300). A satisfactory fit of amplitude and duration of the observed waveforms is obtained assuming a young oceanic model with an average water column of 1 to 2 km and relatively high S-wave velocity (2.5 km/s) in the shallow crust.
Appears in Collections:04.06.09. Waves and wave analysis
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