Station Overview

legend Overview at SGAK
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Network CH
Station Code SGAK
Station Description Gampel, Kirche, VS
Latitude (WGS84) 46.31533
Longitude (WGS84) 7.741361
Station altitude (CH1903) 687.0
running from 2016-05-30
...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 B
Ground type SIA C
Basin Information In a sedimentary basin with lateral propagation and 2D/3D resonance effects basin
Reference Hobiger Manuel, Bergamo P., Michel C. & Fäh D., "SITE CHARACTERIZATION REPORT SGAK: Gampel (VS) - Kirche", Swiss Seismological Service, ETH Zürich, 2017
Resonance Frequency (Hz) 1.95
Uncertainty Factor -
Vs 30 (m/s) 378
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 30-05-2016
End Date -
Housing Class Free field
Housing Description small pot, concrete vault, sensor bolted to the foundation
sensor depth below station 0.5 m
Distance to Building (m) -

Current Instrumentation

Location code (none)
On date 30-05-2016 17:00:00
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

Site Characterization

channel group
Empirical Amplification
CH.SGAK..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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