Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8668

Authors: La Rocca, M.*
Del Pezzo, E.*
Galluzzo, D.*
Scarpa, R.*
Title: Joint observation of coherent coda waves at surface and underground arrays
Title of journal: Geophysical Journal International
Series/Report no.: /194 (2013)
Publisher: Wiley-Blackwell
Issue Date: 16-Apr-2013
DOI: 10.1093/gji/ggt111
Keywords: Coda waves
Wave scattering and diffraction
Wave propagation
Abstract: Local and regional seismicity jointly recorded by two dense small aperture arrays, one installed at surface and one at 1.3 km depth, constitutes an interesting data set useful for coda observations. Applying array techniques to earthquakes recorded at the two arrays we measure slowness, backazimuth and correlation coefficient of the coherent coda wave signals in five frequency bands in the range 1–10 Hz. Slowness distributions show marked differences between surface and underground, with slow signals at surface (slowness greater than 1.0 s km−1) that are not observed underground. We interpret these coherent signals as surface waves produced by the interaction of body waves with the free surface characterized by rough topography. The backazimuth values measured in the frequency bands centred at 1.5 and 3 Hz are almost uniformly distributed between 0 and 360◦, while those measured at higher frequencies show different distributions between surface and underground. On the contrary, the earthquake envelopes show very similar coda shapes between surface and underground recordings, with an almost constant coda-amplitude ratio (between 4 and 8) in a wide frequency range.
Appears in Collections:04.06.09. Waves and wave analysis
Papers Published / Papers in press

Files in This Item:

File Description SizeFormatVisibility
LaRocca_etal_GJI2013.pdfMain article1.36 MBAdobe PDFonly authorized users View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Share this record
Del.icio.us

Citeulike

Connotea

Facebook

Stumble it!

reddit


 

Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA