SED Stations

Station Overview

Field	Value
image
legend

Overview Location
Picture Gallery	details...

Field	Value
Network
Station Code
Station Description
Latitude (WGS84)
Longitude (WGS84)
Station altitude (CH1903)
running from
...until
Waveform Access

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

Field	Value
Sensor Types

Sensor Types	Accelerometer Velocimeter

Field	Value
Geological Unit
Site Morphology Class
Site Morphology Description
Ground type EC8
Ground type SIA
Basin Information
Reference

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

Field	Value
Resonance Frequency (Hz)
Uncertainty Factor

Resonance Frequency (Hz)	.62
Uncertainty Factor	-

Field	Value
Vs 30 (m/s)

Vs 30 (m/s)	581

Field	Value
Location Map
Topography Map
Geology Map

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

Field	Value
Location Code
Opening Date
End Date
Housing Class
Housing Description
sensor depth below station
Distance to Building (m)

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

Field	Value
Location code
On date
Off date
Sensor model
Sensor manufacturer
Digitizer model
Digitizer manufacturer
Channels
Stream Noise (last week)

Location code	01
On date	24-02-2023 13:43:00
Off date	-
Sensor model	Titan 2G
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
Sensor manufacturer	Nanometrics
Digitizer model	Centaur
Digitizer manufacturer	Nanometrics
Channels	HHE , HHN , HHZ
Stream Noise (last week)	HHE , HHN , HHZ

Instrumentation History

Field	Value
Location code
On date
Off date
Waveform Access
Sensor model
Sensor manufacturer
Digitizer model
Digitizer manufacturer
Channels

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 Filter dialog for field: channel group and Options for empty fields: only empty fields no empty fields include empty fields	Empirical Amplification Filter dialog for field: Empirical Amplification and Options for empty fields: only empty fields no empty fields include empty fields
CH.FLACH.01.HG
CH.FLACH.01.HH
CH.FLACH..EH

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...

Field	Value
measurements nearby

measurements nearby	list...