Please use this identifier to cite or link to this item:
Authors: Pignagnoli, L.* 
Chierici, F.* 
Favali, P.* 
Beranzoli, L.* 
Embriaco, D.* 
Monna, S.* 
D’Oriano, F.* 
Zitellini, N.* 
Title: Tsunami Early Warning System: Deep Sea Measurements in the Source Area
Issue Date: Nov-2011
Series/Report no.: special issue / DTA 06-2011 (2011)
Keywords: Tsunami Detection
Early Warning
Tsunami Generation
Subject Classification05. General::05.08. Risk::05.08.01. Environmental risk 
Abstract: In the framework of the EU project NEAREST, a new Tsunami Early Warning System (TEWS), able to operate in tsunami generation areas, was developed and installed in the Gulf of Cadiz. The TEWS is based on the abyssal station GEOSTAR, placed above a major tsunamigenic structure, and on three seismic centres of Portugal, Spain and Morocco. The core of the system is a tsunami detector installed onboard of GEOSTAR. The tsunami detector communicates with a surface buoy through a dual acoustic link. The buoy is connected to land stations via satellite link. The system was designed for near-field conditions and successfully operated from August 2007 to August 2008, 100 km SW of Cabo de Sao Vincente (Portugal). A new mission started on November 11th, 2009 in the same location. The tsunami detection is based either on pressure events either on seismic events. The bottom pressure data are analysed in real-time at the seafloor by a new tsunami detection algorithm, which can recognize tsunami waves as small as one centimetre. At the same time it was developed a new theoretical approach to account for tsunami generation in compressible water and in presence of a porous sediment. This model showed that hydro-acoustic waves, travelling much faster than the tsunami, are caused by the seafloor motion. These waves can propagate outside the generation area and are characterised by a modulation carrying valuable information on the seafloor motion, which can be recovered from their first arrival.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat 
Pignagnoli_etal_RisksCNR.pdf311.4 kBAdobe PDFView/Open
Show full item record

Page view(s) 10

Last Week
Last month
checked on May 27, 2019

Download(s) 20

checked on May 27, 2019

Google ScholarTM