MENU

Station Overview

Overview Location
Picture Gallery details...
Network 8D
Station Code CHBA
Station Description Allschwil, Sekundarschule, BL
Latitude (WGS84) 47.55088
Longitude (WGS84) 7.5434
Station altitude (CH1903) 277.0
running from 2014-09-24
...until 2015-09-10
Waveform Access restricted
Sensor Types Accelerometer
Geological Unit Alluvial terrace (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 Terrace above the Rhine plain
Ground type EC8
Ground type SIA
Basin Information Rhine basin
Reference
Resonance Frequency (Hz) 1.25
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 24-09-2014
End Date 2015-09-10
Housing Class Urban free field
Housing Description Basement of a 1 story masonry building (sensor screwed on the concrete floor)
sensor depth below station 0.5 m
Distance to Building (m) -

Current Instrumentation

No open epochs

Location code (none)
On date 24-09-2014 00:00:00
Off date 2015-09-10 23:59:59
Waveform Access restricted
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.CHBA..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 -
measurements nearby list...