Portable Broadband Seismology

1
Portable Broadband Seismology
Part 9 Sensor Quality Control

• Jakarta, Indonesia
• May 11-13, 2006
• Bruce Beaudoin
• Marcos Alvarez

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Broadband Seismometers
Guralp CMG-3T
Streckeisen STS-2
3
Guralp CMG-3T
Orthogonal elements 2 Horizontal 1 Vertical
4
Guralp CMG-3T
Vertical Element Pivot
Horizontal Element Pivot
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(No Transcript)
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Streikeisen STS-2
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Transformation Equations
East North Vertical
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Element Contribution to Signal
9
E
N
Z
Z
N
E
STS-2 Element W problem
10
E
N
Z
STS-2 Element V problem
11
Obvious Problems With Time Series
E N Z
Ref
E N Z
STSA
STS-2 With Bad Element V Hinge
12
Inadequate Vault
13
Pier Test - Simultaneous recording of - 3
CMG-40T E/W comp
Odd 40T
14
Response to White Noise Calibration Input
Amplitude
Odd 40T
40T-30sec
Frequency
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Day 2
Day 3
STS-2 Flooded On Day 3 After Installation
F 7
16
Electronic Noise? Bad Cable? Note teleseism
overwhelms the noise on day 4
F 10
17
Unexplained Intermittent Monochromatic Noise
F 12
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(No Transcript)