Vielha-Hospitau seismic station (VIES)
Code: CA.VIES Name: Vielha-Hospitau Latitude: 42.7016 N Longitude: 0.7969 E Height: 986 m Local depth: 0 m Owner: Institut Cartogràfic i Geològic de Catalunya, Instituto Geográfico Nacional |
| Soil features | ||||
|---|---|---|---|---|
| Lithology | Period | Vs30 (m/s) | Classe EC8 | F0 (Hz) |
| Pebbles and silts | Quaternary | 395 | E | 3.8 |
| Instrumentation by channels and periods | ||||
|---|---|---|---|---|
| Channels | Start date | Sensor type | Digitizer type | Instrumental response |
| HNZ, HNN, HNE | 22/10/2004 | Accelerometer | 24 bits | [StationXML] |
Geophysical characterisation
H/V Spectral ratio from seismic noise
H/V spectral quotient of the seismic noise record at the Vielha - Hospitau seismic station. A peak is observed around 4.0 Hz that can be related to the fundamental frequency of the soil and, therefore, an acoustic impedance contrast is expected in the subsoil.
H/V Spectral ratio of seismic noise records from Vielha-Hospitau seismic station.
S-waves velocity model
In the shear wave propagation velocity model (Vs) obtained by inverting the dispersion curves (array technique), a surface layer with a velocity of about 360 m/s and a thickness of about 18 meters is observed. Below, the velocity increases progressively as the depth increases. Up to 46 meters there are 835 m/s and then the velocity increases to 920 m/s. At about 50 meters deep, velocity values close to 1350 m/s are detected, which can be interpreted as the rocky basement.
S-waves velocity model of Vielha-Hospitau seismic station.