Jiri Zahradnik Charles University, Prague
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Transcript of Jiri Zahradnik Charles University, Prague
![Page 1: Jiri Zahradnik Charles University, Prague](https://reader036.fdocuments.net/reader036/viewer/2022062301/56812ce3550346895d91a8f6/html5/thumbnails/1.jpg)
Three BB and SM seismic stations in the Corinth Gulf
jointly operated by the universities in Prague and Patras
Jiri Zahradnik
Charles University, Prague
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Co-operation:
G-A. Tselentis, E. Sokos,
A. Serpetsidaki
V. Plicka, J. Jansky
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Sergoula, Mamousia, University
• CMG 3T BB vel
• CMG 5T SM acc
• DM24 + SAM
• 20 Hz continuous
• 100 Hz triggered
• stand-alone
• 3-5 months
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Sergoula, Mamousia, University
• CMG 3T BB vel
• CMG 5T SM acc
• DM24 + SAM
• 20 Hz continuous
• 100 Hz triggered
• stand-alone
• 3-5 months
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April 8, 2001SERG
black=obs.red=synth.
My “normal” jobis modeling, buttoday I want to discuss the datareliability.
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Are our data accurate ?
• Compare the instrumentally corrected records, sampling 100 Hz (5T accel. and the differentiated 3T)
• Demonstrate complications
velocityacceleration
Zeros and poles fromfactory calibration tests
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Vartholomio earthquake
• Dec.2, 2002
• 04:58
• M=5.4 (PATNET)
• Mw=5.6 (MEDNET)
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VartholomioDec. 2, 2002
M 5.4at MAMO
(94 km)
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3T clipped(2 mm/sec)
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3T clipped(2 mm/sec)
ZOOM
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MAMO
clipped 3T viewed as non-clipped acceleration(suggesting a method how to correct clipping)
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MAMO
with the clipped part
without
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Noise (natural and instrumental)
microseisms resolved by 3T, but not resolved by 5T
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MAMO
Minimum frequency available from the 5T accelerograph (M 5.4; 94 km)
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Vartholomio earthquakeM 5.4
at SERG (102 km)
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Vartholomio earthquakeM 5.4
at SERG (102 km)
temporaryGPS (digitizer)problem
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SERG
fit in EW asgood as in Z(3T || 5T)
some HF noise ?
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SERG
velocitynot clipped
velocity in SERG is lower than in MAMO,but acceleration is SERG is higher
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SERG
a significant HF ‘ringing’ of 3T(not caused by clipping)
ZOOM
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SERG
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SERG
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Local event recorded at SERG
• Dec.10, 2002
• 16:47
• M 3.8
• SERG:
D=13 km
A=84o
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Local M 3.8 at SERG(13 km)
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Local M 3.8 at SERG
(13 km)
less problems onthe Z-comp. of 3T,both in HF and LF
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Too noisy LF signal on 5T even at f ~ 0.1 Hz
M 3.8 recorded at D=13 km
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Local event recorded at SERG
• Nov. 13, 2002
• 21:55
• M 3.0
• SERG:
D=7.5 km
A=51o
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SERGNovember 13, 2002; at 21:55; M 3
SERG: D=7.5 km, A=51o
NS-comp. of 3T velocity EW-comp. of 3T velocity
a rare disturbance(signal-generated)
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occasionally,the LF signal on 3T is “as bad” as on 5T !
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LF
the LF signal on Z-comp. of 3T is OK
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M 3 at SERG
(7 km)
HF noise on horizontalcomponents of 3T
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Local event recorded at UNIV
• Nov. 26, 2002
• 12:13
• M 3.5
• UNIV:
• D=13 km
• A=209o
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Nov. 26, 2002M 3.5
at UNIV(13 km)
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Nov. 26, 2002M 3.5
at UNIV(13 km)
GPS problem
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Local event recorded at UNIV
• Apr. 18, 2003
• 12:49
• M 2.5
• UNIV:
D=5 km
A=126o
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April 18, 2003 M 2.5
at UNIV (5 km)
GPS recovered “itself”
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April 18, 2003 M 2.5
at UNIV(5 km)
HF instrumental noise in 3TLF instrumental noise in 5T(complementary)
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Conclusion
• joint deployment of 3T BB and 5T SM revealed problems of both instruments
• HF noise peak (30 Hz) on horiz. comp. of 3T
• white accel. noise of 5T
• occasional disturbances on horiz. 3T (tilt ?)
• temporary timing (GPS, digitizer) problems
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Instrumentally “corrected” records are rarely correct
to every detail.
Joint deployment of
the 3T (BB) and 5T (SM) helps to reveal problems, and the instruments
complement each other.
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All data available fromhttp://seis30.karlov.mff.cuni.cz
Thank you !
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