Station Overview

Overview Location not available
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Network 8D
Station Code CHBFR
Station Description Frenkendorf, BL
Latitude (WGS84) 47.50362
Longitude (WGS84) 7.709118
Station altitude (CH1903) 345.0
running from 2006-10-13
...until 2007-05-09
Waveform Access open
Sensor Types Velocimeter
Geological Unit Weathered Loess (Pleistocene)
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 Hillside
Ground type EC8
Ground type SIA
Basin Information Ergolz basin
Resonance Frequency (Hz) 3.78
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 13-10-2006
End Date 2007-05-09
Housing Class Urban free field
Housing Description Ground floor of a transformer house
sensor depth below station 0.0 m
Distance to Building (m) -

Current Instrumentation

No open epochs

Location code (none)
On date 13-10-2006 00:00:00
Off date 2007-05-09 00:00:00
Waveform Access open
Sensor model LE-3D-5s
Sensor manufacturer Lennartz
Digitizer model Q330
Digitizer manufacturer Quanterra
Channels EHE , EHN , EHZ

Site Characterization

channel group
Empirical Amplification
8D.CHBFR..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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