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Organyà seismic station (CORG)

Code: CA.CORG Name: Organyà 

Latitude: 42.2290 N Longitude: 1.3165 E Height: 720 m

Local depth: - m

Owner: Institut Cartogràfic i Geològic de Catalunya

Subsoil features

Lithology

Period

Vs30 (m/s)

Classe EC8

F0 (Hz)

Limestones

Cretaceous

943

A

-

Instrumentation by channels and periods

Channels

Start date

Sensor type

Digitizer type

Instrumental response

HHZ, HHN, HHE

01/02/2001

Broadband velocimeter

24 bits

[StationXML]

Geophysical characterisation

H/V Spectral ratio from seismic noise

H/V Spectral ratio from seismic noise records of Organyà 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 from Organyà seismic station.

P-waves velocity  model

In the P-waves velocity model, obtained by seismic refraction tomography, a surface level of low-velocity materials, less than 1500 m/s, is observed, usually these values ​​are associated with unconsolidated materials. It is about 10 meters thick. Below this level, a strong velocity gradient is detected, exceeding the velocity value of 5000 m/s at a depth of about 15 meters. These high velocity values ​​are associated with the bedrock. It should be noted that the seismic well of the Organyà seismic station would be located on the materials that are about 10 meters deep.

P-waves velocity model of Organyà seismic station.

S-waves velocity model

In the shear wave propagation velocity (VS) model obtained by seismic refraction tomography, a surface layer of unconsolidated materials (VS <800 m/s) is detected, which is about 10 meters thick. Below this level, a strong velocity gradient is observed, exceeding the velocity value of 1500 m/s at a depth of approximately 15 meters. The bedrock (VS > 1000 m/s) is about 12 meters deep. It should be noted that the seismic well of the Organyà seismic station would be located on the materials that are about 10 meters deep.

S-waves velocity model of Organyà seismic station.

Images

3 multimedia

Description: View of Organyà seismic station with the fence, the instrumental house, the solar pannels and the seismometer vault (white colour cover).