Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.s23a..01r&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #S23A-01
Physics
0910 Data Processing, 0935 Seismic Methods (3025, 7294), 0994 Instruments And Techniques, 7212 Earthquake Ground Motions And Engineering Seismology, 7294 Seismic Instruments And Networks (0935, 3025)
Scientific paper
The GEOSCOPE program was launched in 1982 by the National Institute of Sciences of Universe (INSU), a department of the French National Center of Scientific Research (CNRS), following the initiative of the Institute of Physics of the Earth of Paris (IPGP). The purpose was the installation of about 25 stations well distributed worldwide (in particular in the southern hemisphere), in the standard configuration defined by the FDSN (very broad-band 24 bit, continuous recording at 20sps). At present, the GEOSCOPE program is operating 28 digital 3-component very- broadband stations. In terms of site locations, the aim of the GEOSCOPE program is almost fulfilled. Our purpose is to maintain the stations at original sites (Indian Ocean, Africa) and to fill some geographical gaps at high latitudes in the southern and northern hemisphere. In particular, at high latitudes in Russia, we plan to install a new station VOR (Vorkuta) and to move the station SEY (Seimchan) to a new location in northern Kamchatka. We are also working on improving data quality and transmission. Historically, GEOSCOPE did not operate real- time data. Continuous data from most of stations arrive with significant delays and records from large events are teletransmitted from some stations (by phone RTC line or through internet) and are made available within one day. To improve this situation, we are replacing the old Streckeisen digitizers with new Quanterra data loggers, essentially Q330-HR ones. Presently data from 13 stations are made available at the IPGP Geoscope Data Center in near real-time, with a delay depending on the station: 1- ATD (Arta, Djibouti), a joint CTBTO/CERD/G station 2- CAN (Canberra, Australia), a joint ANU/G station 3- DZM (Dzumac, New Caledonia, a joint DASE/CTBTO/G station 4- ECH (Echery, France) 5- FDF (Fort de France, French West Indies) 6- KIP (Kipapa, Hawai), a joint IRIS/USGS/G station 7- PAF (Port aux Français, Kerguelen Island) 8- RER (Riviere de l'Est , La Reunion) 9- SSB (Saint Sauveur-Badole, France) 10- SPB (Sao Paulo, Brazil) 11- TAM (Tamanrasset, Algeria) 12- TAOE Marquesas Islands, a joint DASE/G station 13- TRIS Tristan Da Cunha, a joint IRIS/USGS/G station Our challenge is to link the maximum number of stations to our Data Center for getting data in real time. To reach this objective in a few years, we plan to upgrade more than 2 stations every year, our priority in 2007 is the upgrade of stations PEL and COYC in Chile. For the last ten years we have been progressively installing en environmental sensors (microbaromètres, thermometers), transforming all our stations in multiparameter observatories. We also are participating to the national efforts for the creation of a Tsunami Warning Center at La Réunion Island in the frame of the CNATOI project (Centre National d'Alerte aux Tsunamis dans l'Océan Indien). That project includes the installation of two new stations in 2007, one at Rodrigues Island (Mauritius) and one at Fort- Dauphin (NAM station, Madagascar). Daily automatic procedures allow to compute the noise level plots of each component, for each station in near real-time, in order to detect any anomalous behaviour of the station and to follow the station status.
Maggi Alessia
Roult Geneviève
Stutzmann Eléonore
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