Network Description

The installation of the first equipments of the ground motion network started in June 1995 with different objectives. Mainly, to record adequately (without saturation) strongs motions, felt by population of the region. Also to carry out the study of the attenuation relationships of the acceleration with distance, the study of the amplification of soils in urban areas and to facilitate the studies of the seismic source for the big earthquakes between others aspects.

The main criteria used for site selection are following:
1) zones affected by big earthquakes at the past (the most active zones with seismic zones); ,
2) zones with moderate seismic activity highly populated and/or dangerous industries;
3) sites on different materials, soil and rock, to analyse the amplification of the ground motion.

At present 18 accelerometers are avalaible, 13 of which linked(*) by real-time connection.

The recording system is digital (at 200 or 100 samples per second) and the equipments are configured to record the three components of the ground motion in a continuous way or also in local recording when the trigger value oscillates on the different sites normally between 0.2x10-3g and 1.5x10-3g.

Main characteristics of the accelerometric stations of Catalonia
Accelerometer	Code	Installation date	Latitude (N)	Longitude (E)	Height (m)	Soil type	Sensor	Owner
Owner: IGC, Geologic Institute of Catalonia; IGN, National Geographic Institute; BRGM, Bureau de Recherches Géologiques et Minières (France); IEA, Institut d'Estudis Andorrans.
Fabra	FBRR	6/06/1995	41º 24' 59"	2º 07' 30"	420	Shales(Paleozoic)	SSA-2	IGN
Olot	OLOS	7/06/1995 22/06/2010	42º 10' 58"	2º 29' 26"	436	Basalts (Quaternary)	SSA-2 CMG-5TD	IGN IGC*
Vielha 1	VIES	9/06/1995 (retired)	42º 42' 14"	0º 47' 50"	965	Alluvial (Quaternary)	SSA-2	IGN
Vielha 1	VIES	22/10/2004 11/05/2010	42º 42' 43"	0º 48' 01"	969	Alluvial (Quaternary)	SSA-2 CMG-5TD	IGN IGC*
Vielha 2	VIER	5/05/1998 (retired)	42º 41' 53"	0º 47' 48"	1105	Sandstones(Paleozoic)	K2	IGC
Vielha 2	VIER	4/07/2002	42º 42' 16"	0º 47' 32"	994	Tubidites (Paleozoic)	Geosys	IGN
Vielha 3	TUNR	3/07/2002	42º 37' 22"	0º 46' 01"	1582	Alluvial (Quaternary)	Geosys	IGN
Montjuïc	MTJR	11/02/1997	41º 22' 16"	2º 09' 25"	51	Sandstones(Miocene)	Geosys	IGC
Llívia 1	LLIR	10/11/1997	42º 28' 45"	1º 58' 27"	1413	Ritmites (Paleozoic)	K2	IGC*
Llívia 2	LLIS	27/10/2001	42º 27' 53"	1º 58' 24"	1190	Alluvial (Quaternary)	K2	IGC*
Celoni 1	CELS	22/02/2001	41º 41' 34"	2º 29' 34"	150	Alluvial (Quaternary)	K2	IGC*
Celoni 2	CELR	20/09/2001 (retired) 26/06/2008	41º 41' 07"	2º 29' 57"	140	Granite (Paleozoic)	K2	IGC*
Andorra	AND1	10/11/2003 (retired) 1/07/2007	42º 30' 48''	1º 30' 14''	1078	Marlycalcareous and shales (Paleozoic)	Etna	IEA
Nébias (França)	FNEB	1/01/2007	42º 54' 11'	2º 06' 23''	580	Lacustrine limestone (Paleogene)	Episensor	BRGM
Granollers	GRAM	24/04/2008	41º 36' 26''	2º 17' 19''	215	Alluvial (Quaternary)	K2	IGC*
Montoussé (França)	FMON	24/09/2008	43º 03' 45''	0º 24' 55''	630	Limestone(Lower Cretaceous)	Episensor	BRGM
Espira-de-l'Agly (França)	FESP	17/10/2008	42º 49' 07''	2º 49' 15''	170	Limestone(Lower Cretaceous)	Episensor	BRGM
Estadística	BAJU	26/02/2009	41º 23' 07''	2º 10' 27''	25	Alluvial (Quaternary)	CMG-5TD	IGC*
Girona- Universitat	GIRR	19/03/2010	41º 59' 07''	2º 49' 40''	104	Limestone (Paleogene)	CMG-5TD	IGC*
Lleida	ILER	23/03/2010	41º 37' 14''	0º 37' 14''	180	Shales and grainstones (Paleogene)	CMG-5TD	IGC*
Tetuan	BINT	28/04/2010	41º 23' 45''	2º 10' 24''	36	Alluvial (Quaternary)	CMG-5TD	IGC*
Avinyó	AVIN	09/11/2010	41º 50' 44''	1º 57' 59''	329	Limestones and marls (Paleogene)	CMG-5TD	IGC*
Girona- Generalitat	GIRS	21/02/2011	41º 59' 02''	2º 49' 39''	79	Aluvial (Quaternary)	CMG-5TD	IGC*
Reus	Reus	06/05/2011	41º 08' 05''	1º 11' 09''	48	Aluvial (Quaternary)	CMG-5TD	IGC*

IGC Institut Geològic de Catalunya

Seismology