National Center for Earthquake Engineering Research in Algeria

1. Centre National de Recherche appliquée en Génie Parasismique National Center of Applied Research in Earthquake Engineering CGS Seismic Networks M. CHIKH(1), N. LAOUAMI(1), N. SLIMANI(1), D. BOUZIANE(1), K. ABBAS(1) & J.L. CHATELAIN(1,2) (1) Centre National de Recherche Appliquée en Génie Parasismique, Algérie (2) Institut de Recherche pour le Développement (IRD/LGIT, Grenoble - France) ______________________________________________________ Rue Kaddour Rahim, BP 252 Hussein-Dey, Alger, Algérie. Tel: 021.495547 à 49; 021.495560 à 62 Fax: 021.495536; E-mail : cgsd@wissal.dz ; cgsd@cgs-dz.org,Web : www.cgs-dz.org

2. Centre National de Recherche Appliquée en Génie Parasismique (CGS) • CGS is an organization whose objective is to develop, implement and disseminate scientific knowledge and technical engineering to help reduce seismic risk in Algeria. • CGS goals are to study : • the probability of earthquake occurrence and characteristics, • local hazards such as site effects • construction types and population density to assess their seismic vulnerability. • CGS is also involved in enactment and enforcement of construction codes and future development planning at both the regional and local levels as well as the development of adapted plans for prevention and intervention.

3. L’idée de mettre en place un réseau national d’accélérographes date de 1976, dans le but de mettre en forme un cadre parasismique national. Le séisme d'El-Asnam de 1980 a servi de catalyseur pour l’acquisition des accélérographes Les premières 90 stations ont été acquises en 1982 pour atteindre le nombre de 335 en 2003

4. 170 analog stations SMA-1 40 digital stations SSA-1 125 digital stations Etna Accelerograph shelter (TEXANA-JIJEL) Free field Accelerometric station installation Algerian Accelerometric Network distribution

5. Data is collected manually at each regular visit to the stations • Data archiving is two ways made • Analog data (photo film’s from SSA-1 stations) are archived by traditional way in dry and constant temperature environment, then, the data are digitized by 200sps steps using SCANVIEW software. • All digital data (from SSA-1, Etna and digitized data from SMA-1) are stored both on hard disk and DVD.

6. Communication armor (Etna stations)

7. In 2003, CGS acquired 5 broadband stations (National network) and 10 short period stations (aftershock’s recording). Broad Band station Data logger Quanterra Q330 and Packet Baler Model 14D Sensor Strikisen STS2 Short period stations Data logger Kinemetrics K2 Sensor Lennartz LE-3Dlite

8. University of Algiers Targelt (Souk-Ahras) M’chounech (Biskra) Terni (Tlemcen) (Laghouat) Beni-Ounif (Bechar) Seismic stations distribution (CGS National Network)

9. Terraguelt, Souk Ahras University of Algiers M’Chouneche, Biskra Fendi, Beni Ounif, Bechar

10. Retrieving and Archiving Data(Seismic Network ) • First stage, data will be collected manually at each regular visit to stations. • Second stage, the seismological stations will be connected to Internet using WLL (Wireless Local Loop). • Third stage, real time acquisition will be implemented. • Data will be stored both on hard disk and DVD.