Station Overview

Overview Location
Picture Gallery details...
Network CH
Station Code BALST
Station Description Balsthal, SO
Latitude (WGS84) 47.33599
Longitude (WGS84) 7.69485
Station altitude (CH1903) 860.0
running from 2000-06-16
...until now
Sensor Types Accelerometer Velocimeter
Geological Unit Limestone of Oxfordian age (Effinger layer - Jurassic)
Site Morphology Class T2
T1: flat; T2: slope; T3: ridge and T4: steep ridge;
following Pessina and Fiorini (2014) A GIS procedure for fast topographic characterization of seismic recording stations, Soil Dynamics and Earthquake Engineering, 63, p248-258
Site Morphology Description Edge of a limestone plateau
Ground type EC8 A
Ground type SIA A
Basin Information not in a sedimentary basin with possible 2D/3D effects
Reference Fäh Donat, Fritsche S., Poggi V. et al., "Determination of Site Information for Seismic Stations in Switzerland. Work Package 4: Pegasos Refinement Project", Swiss Seismological Service, ETH Zürich, 2009
Resonance Frequency (Hz) .61
Uncertainty Factor -
Vs 30 (m/s) 1332
Location Map


Federal Office of Topograpy: National Map 1:25‘000
Topography Map


Federal Office of Topograpy: DHM25: Digital Height Model 1:25000
Geology Map

Federal Office of Topograpy: Geological map of Switzerland 1:500‘000

Sensor locations

Location Code (none)
Opening Date 16-06-2000
End Date -
Housing Class Free field
Housing Description Sensor in underground shelter, less than 5m directly below free surface, 5m from nearest entrance. Sensor placed on concrete pedestal 0.5m high on rock.
sensor depth below station 4.5 m
Distance to Building (m) -

Current Instrumentation

Location code (none)
On date 23-01-2020 10:30:00
Off date -
Sensor model EpiSensor ES-T
Sensor manufacturer Kinemetrics
Digitizer model Centaur
Digitizer manufacturer Nanometrics
Channels HGE , HGN , HGZ
Stream Noise (last week) HGE , HGN , HGZ
Location code (none)
On date 23-01-2020 10:30:00
Off date -
Sensor model STS2_gen3
Sensor manufacturer Streckeisen
Digitizer model Centaur
Digitizer manufacturer Nanometrics
Channels BHE , BHN , BHZ , HHE , HHN , HHZ
Stream Noise (last week) BHE , BHN , BHZ , HHE , HHN , HHZ
Location code (none)
On date 05-04-2004 00:00:00
Off date 2020-01-23 10:30:00
Sensor model STS2_gen3
Sensor manufacturer Streckeisen
Digitizer model HRD24
Digitizer manufacturer Nanometrics
Channels BHE , BHN , BHZ , HHE , HHN , HHZ
Location code (none)
On date 16-06-2000 00:00:00
Off date 2004-04-05 00:00:00
Sensor model STS2_gen3
Sensor manufacturer Streckeisen
Digitizer model HRD24
Digitizer manufacturer Nanometrics
Channels BHE , BHN , BHZ , HHE , HHN , HHZ

Site Characterization

channel group CH.BALST..HG
Empirical Amplification not available
channel group CH.BALST..HH
Empirical Amplification not available

Obtained from spectral modeling of small earthquakes with constant update.

  • Top: Fourier amplification with elastic (dashed line) and anelastic (solid line) amplification functions;
  • Centre: 5% damped response spectra amplification (anelastic);
  • Bottom: Number of recordings used.

See Edwards et al. (2013), Determination of Site Amplification from Regional Seismicity: Application to the Swiss National Seismic Networks. Seismological Research Letters, 84(4), 611–621.

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Authoritative Site Characterization Analysis details...
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