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Station Overview

Overview Location
Picture Gallery details...
Network CH
Station Code FLACH
Station Description Felsenburg, Rüdlingen, SH
Latitude (WGS84) 47.57241
Longitude (WGS84) 8.5679
Station altitude (CH1903) 412.0
running from 2003-08-29
...until now
Waveform Access open
Sensor Types Accelerometer Velocimeter
Geological Unit Molasse of Burdigalian age (Miocene, Tertiary)
Site Morphology Class T2
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 Steep slope of a molassic hill (about 60m above Rhine river).
Ground type EC8 B
Ground type SIA B
Basin Information not in a sedimentary basin with possible 2D/3D effects
Reference Fäh Donat, Fritsche S., Poggi V. et al., "Determination of Site Information for Seismic Stations in Switzerland. Work Package 4: Pegasos Refinement Project", Swiss Seismological Service, ETH Zürich, 2009
Resonance Frequency (Hz) .62
Uncertainty Factor -
Vs 30 (m/s) 581
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 01
Opening Date 24-02-2023
End Date -
Housing Class Free field
Housing Description Sensor in cave 5m directly below free surface, 2.5m from nearest entrance. BB sensor and accelerometer placed in a 50cm deep borehole, coupled to the sediment via sand. BB and accelerometer are combined in one casing (Cascadia Posthole sensor). Cave located in a steep slope of sandstone.
sensor depth below station 5.5 m
Distance to Building (m) -
Location Code (none)
Opening Date 29-08-2003
End Date 2023-02-24
Housing Class Free field
Housing Description Sensor in cave 5m directly below free surface, 2.5m from nearest entrance. BB sensor and accelerometer placed in a 50cm deep borehole, coupled to the sediment via sand. BB and accelerometer are combined in one casing (Cascadia Posthole sensor). Cave located in a steep slope of sandstone.
sensor depth below station 4.6 m
Distance to Building (m) -

Current Instrumentation

Location code 01
On date 24-02-2023 13:43:00
Off date -
Sensor model Titan 2G (Cascadia)
Sensor manufacturer Nanometrics
Digitizer model Centaur
Digitizer manufacturer Nanometrics
Channels HGE , HGN , HGZ
Stream Noise (last week) HGE , HGN , HGZ
Location code 01
On date 24-02-2023 13:43:00
Off date -
Sensor model Trillium Compact 120s (Cascadia)
Sensor manufacturer Nanometrics
Digitizer model Centaur
Digitizer manufacturer Nanometrics
Channels HHE , HHN , HHZ
Stream Noise (last week) HHE , HHN , HHZ
Location code (none)
On date 24-02-2011 00:00:00
Off date 2023-02-24 13:43:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model Taurus
Digitizer manufacturer Nanometrics
Channels EHE , EHN , EHZ
Location code (none)
On date 20-02-2004 00:00:00
Off date 2011-02-24 00:00:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model Trident
Digitizer manufacturer Nanometrics
Channels EHE , EHN , EHZ
Location code (none)
On date 11-09-2003 12:15:00
Off date 2004-02-20 00:00:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model Trident
Digitizer manufacturer Nanometrics
Channels EHE , EHN , EHZ
Location code (none)
On date 29-08-2003 12:00:00
Off date 2003-09-11 12:15:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model Trident
Digitizer manufacturer Nanometrics
Channels EHE , EHN , EHZ

Site Characterization

channel group
 Empirical Amplification
CH.FLACH.01.HG not available
CH.FLACH.01.HH not available
CH.FLACH..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 details...
measurements nearby list...