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Station Overview

Overview Location
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Network CH
Station Code SALTS
Station Description Altdorf, Spital, UR
Latitude (WGS84) 46.88204
Longitude (WGS84) 8.63821
Station altitude (CH1903) 447.0
running from 2012-11-12
...until now
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 Reuss alluvial plain (alluvial fan)
Ground type EC8 B
Ground type SIA C
Basin Information Reuss basin, interface at fundamental frequency at 320 m depth
Reference Michel Clotaire, Roten D., Cauzzi C., Poggi V., Burjanek J., Fäh D., "Altdorf-Spital (SALTS) Site characterization report", Swiss Seismological Service, ETH Zürich, 2013
Resonance Frequency (Hz) 1.36
Uncertainty Factor -
Vs 30 (m/s) 469
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 12-11-2012
End Date -
Housing Class Free field
Housing Description SED large vault
sensor depth below station 1.0 m
Distance to Building (m) -

Current Instrumentation

Location code (none)
On date 12-11-2012 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

Site Characterization

channel group CH.SALTS..HG
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...
measurements nearby list...