Station Overview

Overview Location
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Network 8D
Station Code CHBAL
Station Description Allschwil, BL
Latitude (WGS84) 47.54356
Longitude (WGS84) 7.518026
Station altitude (CH1903) 335.0
running from 2006-09-29
...until 2007-12-17
Waveform Access open
Sensor Types Accelerometer
Geological Unit 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 Plateau
Ground type EC8
Ground type SIA
Basin Information Rhine basin
Resonance Frequency (Hz) .4
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 29-09-2006
End Date 2007-12-17
Housing Class Urban free field
Housing Description Ground floor of hut attached to a 3-story masonry building
sensor depth below station 0.0 m
Distance to Building (m) -

Current Instrumentation

No open epochs

Location code (none)
On date 29-09-2006 00:00:00
Off date 2007-12-17 00:00:00
Waveform Access open
Sensor model EpiSensor ES-T
Sensor manufacturer Kinemetrics
Digitizer model Taurus
Digitizer manufacturer Nanometrics
Channels HGE , HGN , HGZ

Site Characterization

channel group
Empirical Amplification
8D.CHBAL..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 -
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