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Station Overview

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legend Overview at SIOM
Overview Location
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Network CH
Station Code SIOM
Station Description Sion-Mayennets, VS
Latitude (WGS84) 46.22901
Longitude (WGS84) 7.361916
Station altitude (CH1903) 495.0
running from 1993-03-12
...until now
Waveform Access open
Sensor Types Accelerometer
Geological Unit Alluvial fan
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 Edge of the Rhone alluvial plain (alluvial fan)
Ground type EC8 B
Ground type SIA C
Basin Information Rhone basin, interface at fundamental frequency at 150 m depth
Reference Michel Clotaire, Roten D., Poggi V., Burjanek J., Cauzzi C., Fäh D., "Sion-Mayennets (SIOM) Site characterization report", Swiss Seismological Service, ETH Zürich, 2013
Resonance Frequency (Hz) .47
Uncertainty Factor -
Vs 30 (m/s) 365
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 05-01-2011
End Date -
Housing Class Free field
Housing Description SED small vault
sensor depth below station 0.5 m
Distance to Building (m) -
Location Code (none)
Opening Date 12-03-1993
End Date 2011-01-05
Housing Class Urban free field
Housing Description Inside of transformer house
sensor depth below station 0.0 m
Distance to Building (m) -

Current Instrumentation

Location code (none)
On date 05-01-2011 00:00:00
Off date -
Sensor model EpiSensor ES-T
Sensor manufacturer Kinemetrics
Digitizer model Taurus
Digitizer manufacturer Nanometrics
Channels HGE , HGN , HGZ
Stream Noise (last week) HGE , HGN , HGZ
Location code (none)
On date 12-03-1993 00:00:00
Off date 2011-01-05 00:00:00
Waveform Access open
Sensor model AC-23
Sensor manufacturer GeoSIG
Digitizer model
Digitizer manufacturer
Channels HGE , HGN , HGZ

Site Characterization

channel group
 Empirical Amplification
CH.SIOM..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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