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|Authors: ||Chierici, F.*|
|Title: ||An innovative tsunami detector operating on a multiparameter seafloor observatory|
|Issue Date: ||13-Apr-2008|
|Keywords: ||tsunami detection|
|Abstract: ||During the cruise of the Italian research vessel URANIA on August 2007, a new
tsunami detector was successfully deployed at 3200 b. s. l. in the Gulf of Cadiz, Portugal.
The new detector is installed on board the multi-parameter abyssal observatory
This activity is a task of NEAREST EC Project (http://nearest.bo.ismar.cnr.it/ ).
Among other tasks, the NEAREST project will produce and test the basic parts of
an operational prototype of a near field tsunami warning system. The warning system
includes an onshore warning centre based on the seismic and tide gauges monitoring
networks which are already operating in the area of Gulf of Cadiz and connected in
real time with many warning receiving shore stations, a buoy equipped with meteostation
and two way acoustic and satellite links, and the tsunami detector installed
on board GEOSTAR. The warning centre is in charge of collecting, integrating, and
evaluating data recorded at sea.
In the observatory at the sea bottom, data are recorded and processed by the tsunami
detector which includes a pressure sensor, a seismometer and two accelerometers.
The observatory communicates acoustically with a surface buoy in two-way mode.
The buoy is equipped with meteo station and GPS and it is connected to the shore
station via satellite dual-link.
The prototype is designed to operate in tsunami generation areas for detection-warning
purpose as well as for scientific measurements during long term monitoring. The pressure
data are processed in real time on the sea floor observatory by a tsunami detection
algorithm able to detect small tsunami waves, less than one centimetre, in a very noisy
environment. At the same time the seismic data are analysed using a STA/LTA algorithm.
The tsunami detector sends a near real time automatic alert message when a seismic
or a pressure signal exceeds a selectable threshold indicating a strong local earthquake
or a tsunami wave event. After the detection of an event, the seafloor observatory will
start sending updated pressure data to the shore station. Our objective is to combine
a novel approach to the tsunami warning problem, with a study of the coupling between
the water column perturbations and sea floor motion, together with the long
term monitoring of geophysical, geochemical and oceanographic parameters.|
|Appears in Collections:||Conference materials|
04.06.99. General or miscellaneous
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