Esterri de Cardós seismic station (CEST). Institut Cartogràfic i Geològic de Catalunya

Code: CA.CEST Name: Esterri de Cardós

Latitude: 42.5986 N Longitude: 1.2540 E Height: 1325 m

Local depth: - m

Owner: Institut Cartogràfic i Geològic de Catalunya

Subsoil features
Lithology	Period	Vs30 (m/s)	Classe EC8	F0 (Hz)
Sandstones and lutites	Cambroordovician	1759	A	-

Instrumentation by channels and periods
Channels	Start date	Sensor type	Digitizer type	Instrumental response
HHZ, HHN, HHE	01/06/2006	Broadband velocimeter	24 bits	[StationXML]

Geophysical characterisation

H/V Spectral ratio from seismic noise

H/V Spectral ratio from seismic noise records of Esterri de Cardós seismic station. It is observed an almost flat curve, without any significant peak which might be associated to the fundamental frequency of the soil. This behaviour is typical of rock sites.

H/V Spectral ratio of seismic noise records of Esterri de Cardós seismic station.

P-waves velocity model

The P-waves velocity model, obtained by seismic refraction tomography is characterized by a strong velocity gradient. In the sector of the seismic station, velocities higher than 2500 m/s are reached at a depth of about 5 meters. These high velocity values are associated with unweathered non-ripable rock, and can be interpreted as the bedrock.

P-waves velocity model of Esterri de Cardós seismic station.

S-waves velocity model

In the shear wave (V_S) propagation velocity model obtained by seismic refraction tomography, high velocities are observed near the surface. In the area of the seismic well the bedrock is reached (V_S = 1000 m/s) to 1 meter of depth, and at 5 meters of depth the isoline of 1500 m/s is detected, that habitually is associated to very hard rock .