Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2437
AuthorsRovelli, A.* 
Vuan, A.* 
Mele, G.* 
Priolo, E.* 
Boschi, E.* 
TitleRarely observed short-period (5-10 s) suboceanic Rayleigh waves propagating across the Tyrrhenian Sea
Issue Date2004
Series/Report no./31 (2004)
DOI10.1029/2004GL021194
URIhttp://hdl.handle.net/2122/2437
Keywordssuboceanic Rayleigh waves
Subject Classification04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
AbstractShallow 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.
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