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Glenn Cougoulat – ISTerre
Vibrations study : seismological considerations in instrumentation
Les services d’observations – Coutant / Cougoulat - Nov 2014
Le service d’observation 100 sites permanents
2013 : + 56 sites mobiles
Faits marquants
Modernisation des sites RLBP
XX sites modernisés (infrastructures, communication,
acquisition)
XX sites multi-paramètres (GPS, Acc, BB)
Implémentation d’un système de surveillance
automatique de la sismicité des Alpes
SeiscomP3 - Shake-MapTM
Evaluation rapide des dommages
Expérience CIFALP-Pyrope
Développement d‘une chaîne efficace et performante
depuis l’installation jusqu’à la distribution des données
SO-ISTerreRéseaux Permanents et Mobiles
Les services d’observations – Coutant / Cougoulat - Nov 2014
Sismob-RESIF
Organization: 2 sub-pools (+1 obsolete) dedicated to different scientific targets
tomography of lithospheric targets (74 BB stations),
hazard studies (45 BB stations),
( antennas for studies of shallow structures at 100-m scale, site effects, unconventional seismic
sources etc.: 23 obsolete stations with short-period sensors)
Staff: 2 technical staff for instrument pool (1 fte = 0.2 IR + 0.8 AI); Databases: 4 technical
staff of RESIF-SI (0.55 fte = 0.4 IE + 0.13 IR + 0.02 AI); 1 scientist (0.1 fte)
Instruments of broad interest to all French seismologists interested in data acquisition
from temporary arrays (~50); Public release of data 3 years after end of experiment (see
RESIF-SI)
Funding (2013): 74 k€ = 70 k€ from INSU-CNRS + 4 k€ (user fee). Low user fee because
either it was paid in advance in 2011 (PYROPE, LIBRIS), or it will be paid in 2014 (RHUM-RUM,
DOMERAPI).
Instruments Type Nb
142 dataloggers Nanometrics Taurus 3-channels 119
Agecodagis 6 or 9 channels 23
307 velocimeters Broadband (120s) 3C – STS2 36
Wide-band (30, 60s) 3C – Güralp CMG40 90
Short-period (5s, 2Hz) 3C and 1C 181
20 accelerometers Güralp CMG5 20
119 stations
Les services d’observations – Coutant / Cougoulat - Nov 2014
ISTerre
Measures
Seismology
GPS
Extensometry
Weather, Temperature, Pressure, Rain
Electric
Photogrammétrie…
Field Isoled, mountain, landslides, urban
Les services d’observations – Coutant / Cougoulat - Nov 2014
ISTerre
Test facilities
Characterized test sites
Low noise condition
Calibration table for sensors =>
transfer function
Calibration electronics for digitizers
Les services d’observations – Coutant / Cougoulat - Nov 2014
Supervision : Poste d’observation
Outil de détection automatique Seiscomp
Local seismicity - Sismalp
HRI
HRI
HRI
Réponses instrumentales - Outils
Earth = Filter
Records =
seismogram
Seismic
source (s)
Earth =
Green
function
Measure =
seismometer +
digitizer
Earth = Filter
Low noise model
Usual controls - time
Usual control - frequency
Diurnal variations
Seasonal variations
• Velocity changes or timing check
Cross Correlation
Quality Control
Daily variation on the Z component at station CT26 No concrete slab at this station
PQLX software: Statistical analysis of the power spectral density
Vertical channels
USArray
FR permanent network
TA 127A
TA 135A
What about the horizontal channels…
North channels East channels Period = 100s
Earthquake sea of Okhotsk M=7.7
De
riva
tive
of
atm
osp
he
ric
pre
ssu
re d
(Pre
ssu
re)/
dt
PSD
me
an v
alu
e
Period = 20s Horizontal channels Z channel
PSD
mea
n v
alu
e
Period = 10s Horizontal channels Z channel
PSD
me
an v
alu
e
Time (days) from 08/01/12 to 08/20/12
Insulation developments
HRI developments Coutant et al.
HRI
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