portable broadband seismic stations - checking data quality cairo, egypt november, 2009 noel barstow...
TRANSCRIPT
![Page 1: Portable Broadband Seismic Stations - Checking Data Quality Cairo, Egypt November, 2009 Noel Barstow Bruce Beaudoin Marcos Alvarez](https://reader036.vdocuments.net/reader036/viewer/2022062804/56649edf5503460f94befc1f/html5/thumbnails/1.jpg)
Portable Broadband Seismic Stations -
Checking Data Quality
Cairo, EgyptNovember, 2009
Noel BarstowBruce BeaudoinMarcos Alvarez
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Checking Data QualityKeep good records of everything
> Before going to the fieldTest all Instrumentation and Cables
> In the fieldInstall Station and Check: Power, Timing, Sensor Orientation, Signal
Visit stand-alone stations frequently to: Download Data and Review Station Status and Metadata on site
> In the labArchive, Analyze, and Document Data
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Hardware Maintenance and QC: Dataloggers
Function test all Dataloggers prior to shipment:Bit weight, oscillator drift, data time stamps
Keep maintenance records in an electronic databaseTest and upgrade firmware when necessary
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PASSCAL’s Hardware Maintenance: Seismometers
Feedback seismometers are Pier-Tested for 4-7 Days and compared to a Reference Sensor:- Amplitude and Phase- Polarity- Spectral Content- Noise Characteristics
Electronic Calibrations:- Corner Period- Damping
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Do the signals look the same?
close up of verticals
overlay surface wave
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Nightly Plots of Pier Tests
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Electronic Step Calibration
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White Noise Calibrations
Input White Noise
Pha
se
Am
plitu
deSensor Output
Sensitivity
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Pier Data Comparing Sensor Noise of Different Sensor Types
Ve
rtic
al C
om
pon
en
ts
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Streckeisen STS-2
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€
X = − 2 /3( ) U + 1/6( ) V + 1/6( ) W
Y = 1/2( ) V − 1/2( ) W
Z = 1/3( ) U + 1/3( ) V + 1/3( ) W
STS-2 Element Contribution to Signal
East
North
Vertical
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STS-2 Element V problem
Z
N
E Noisy Sensor
Z
N
E
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Triaxial SystemsR
efer
ence
Unfiltered Earthquake Filtered 10 -30 sec period
Z
N
E
Z
N
E
Tes
t S
enso
r:
Drif
t &
DC
off
set
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Orthogonal elements2 Horizontal1 Vertical
Guralp CMG-3T
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Replace Bent 3T Pivot
Comparing Reference and Problem Sensor
Before
After
Time Scale = 3 hours
Eas
t /
Wes
t C
ompo
nent
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Sudden Noise on Guralp 3T Vertical Component
Noise begins
Noisy Spectra
Days:
1
2
3
4
Ver
tical
Dat
a
Spe
ctra
Locking and Unlocking the 3T provides a temporary fix
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Amplitude change at DC offset
Time = 8 Days
N/S
E/W
Z
Amplitude Problem: Loss of Differential Output
Das, Sensor, or interconnecting Cables could be the cause
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•PASSCAL develops and maintains software to extract data from the dataloggers, perform in-field quality checks, and manipulate the waveforms into archive formats.
•http://www.passcal.nmt.edu•ftp.passcal.nmt.edu
Data QC & Software
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Data Archiving Support PASSCAL acts as an intermediary between
PASSCAL Investigators and the DMC
• Check completeness of data submitted to PASSCAL
• Help evaluate or fix timing
• Verify SEED Format
• Ensure agreement between data and metadata
• Check completeness of data submitted to DMC
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• PASSCAL provides email and phone support for our users before, during, and after experiments to analyze specific problems.
• PASSCAL staff members are available for the initial testing and installation phase of field campaigns.
• Typically there are over 500 broadband and short-period PASSCAL stations deployed at any given time.
• Contact us: [email protected]
Troubleshooting
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After the power point presentation
Live demonstration oflogpeek - plotting of RT130 station log
messagespql - PASSCAL Quick Look - to view
waveforms, fast fourier spectrum, split view, etc.
pql will read mini-seed, sac, and segy formats
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Review Station’s Status
Firmware
Volts
GPS
Timing
Time Scale = 1 WEEK
‘logpeek’Plot of StationLog MessagesFromRT130 DAS