______________________________________________________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

Centre National de Recherche appliquée en Génie Parasismique

CGS Seismic Networks

National Center of Applied Research in Earthquake Engineering

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)

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 :

(1) the probability of earthquake occurrence and characteristics,

(2) local hazards such as site effects

(3) 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.

Centre National de Recherche Appliquée en Génie Parasismique (CGS)

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

Algerian Accelerometric Network distribution

Accelerograph shelter (TEXANA-JIJEL)

170 analog stations SMA-140 digital stations SSA-1125 digital stations Etna

Free field Accelerometric station installation

Data is collected manually at each regular visit to the stations

Data archiving is two ways made

1. 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.

2. All digital data (from SSA-1, Etna and digitized data from SMA-1)

are stored both on hard disk and DVD.

Communication armor

(Etna stations)

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

Seismic stations distribution (CGS National Network)

Fendi, Beni Ounif, Bechar M’Chouneche, Biskra

Terraguelt, Souk AhrasUniversity of Algiers

Retrieving and Archiving DataRetrieving and Archiving Data(Seismic Network )(Seismic Network )

First stage, data will be collected manually at each regular First stage, data will be collected manually at each regular

visit to stations.visit to stations.

Second stage, the seismological stations will be connected to Second stage, the seismological stations will be connected to

Internet using WLL (Wireless Local Loop).Internet using WLL (Wireless Local Loop).

Third stage, real time acquisition will be implemented.Third stage, real time acquisition will be implemented.

Data will be stored both on hard disk and DVD.Data will be stored both on hard disk and DVD.