Station Overview

Overview Location not available
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Network 2A
Station Code GRAE2
Station Description Graechen, GRAE2, VS
Latitude (WGS84) 46.17672
Longitude (WGS84) 7.859407
Station altitude (CH1903) 2865.0
running from 2008-12-09
...until 2009-04-15
Waveform Access open
Sensor Types Velocimeter
Geological Unit Rock slide deposits
Site Morphology Class
Site Morphology Description Rock slope
Ground type EC8
Ground type SIA
Basin Information not in a sedimentary basin with possible 2D/3D effects
Resonance Frequency (Hz) -
Uncertainty Factor -
Vs 30 (m/s) -
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 09-12-2008
End Date 2009-04-15
Housing Class Urban free field
Housing Description Ground floor of a wooden hut (sensor on a metallic tripod hammered in the ground)
sensor depth below station 0.0 m
Distance to Building (m) 5

Current Instrumentation

No open epochs

Location code (none)
On date 09-12-2008 00:00:00
Off date 2009-04-15 00:00:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model
Digitizer manufacturer
Channels EHE , EHN , EHZ

Site Characterization

channel group
Empirical Amplification
2A.GRAE2..EH 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 -
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