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Station Overview

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legend Overview at SWAS
Overview Location not available
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Network CH
Station Code SWAS
Station Description Walenstadt, Sportplatz, SG
Latitude (WGS84) 47.12199
Longitude (WGS84) 9.30881
Station altitude (CH1903) 426.0
running from 2016-03-21
...until now
Waveform Access open
Sensor Types Accelerometer
Geological Unit Alluvium (unconsolidated debris)
Site Morphology Class T1
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 Fluvial geomorphology: alluvial slope, plain, cone
Ground type EC8 C
Ground type SIA D
Basin Information Seez basin
Reference Hobiger Manuel, Imtiaz A. & Fäh D., "SITE CHARACTERIZATION REPORT SWAS: Walenstadt (SG) - Sportplatz", Swiss Seismological Service, ETH Zürich, 2020
Resonance Frequency (Hz) .49
Uncertainty Factor -
Vs 30 (m/s) 220
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 21-03-2016
End Date -
Housing Class Free field
Housing Description big pot, concrete vault, sensor bolted to the foundation
sensor depth below station 1.0 m
Distance to Building (m) -

Current Instrumentation

Location code (none)
On date 17-11-2021 13:00:00
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 21-03-2016 12:39:00
Off date 2021-11-17 13:00:00
Waveform Access open
Sensor model EpiSensor ES-T
Sensor manufacturer Kinemetrics
Digitizer model Centaur
Digitizer manufacturer Nanometrics
Channels HGE , HGN , HGZ

Site Characterization

channel group
 Empirical Amplification
CH.SWAS..HG 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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