Station Overview

legend Overview at SAYF2
Overview Location not available
Picture Gallery details...
Network CH
Station Code SAYF2
Station Description Ayent-Fortunoz, Trafohaus, VS
Latitude (WGS84) 46.28802
Longitude (WGS84) 7.416981
Station altitude (CH1903) 1026.0
running from 2015-04-29
...until now
Waveform Access open
Sensor Types Accelerometer
Geological Unit Clastic sedimentary rocks (calc-shales/slates)
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 Glacial geomoprhology: shaped by the ice age glaciation (moraine, terminal moraine, current glacier)
Ground type EC8 B
Ground type SIA C
Basin Information not in a sedimentary basin with possible 2D/3D effects
Reference Hobiger Manuel, Bergamo P., Panzera F. & Fäh D., "SITE CHARACTERIZATION REPORT SAYF2: Ayent-Fortunau(VS)-Trafohaus", Swiss Seismological Service, ETH Zürich, 2020
Resonance Frequency (Hz) 2.2
Uncertainty Factor -
Vs 30 (m/s) 476
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 29-04-2015
End Date -
Housing Class Free field
Housing Description SSMNet large pot, concrete vault, sensor bolted to the foundation, distance to the closest building (1 story-high) 9m
sensor depth below station 0.0 m
Distance to Building (m) 9

Current Instrumentation

Location code (none)
On date 29-04-2015 09:01:26
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.SAYF2..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.

H/V pick image:
Authoritative Site Characterization Analysis details...
measurements nearby list...