Transcript Portable Broadband Seismology Part 3: Seismometer Overview Jakarta, Indonesia

Portable Broadband
Seismology
Part 3: Seismometer Overview
Jakarta, Indonesia
May 11-13, 2006
Bruce Beaudoin
Marcos Alvarez
A Simple Seismometer
Equipment Inventory:
Seismometers
Sensor
Manufacturer
STS-2
Streckeisen
CMG-3T
CMG3ESP
CMG40T
Gura lp
Gura lp
Power
50 ma @
12vdc
100 ma @
12vdc
100 ma @
12vdc
50 ma @
12vdc
S-13
Gura lp
Teledyne
Geotech
L-4C
Mark Products
passive
L-22
Mark Products
passive
L-28
Mark Products
passive
L-40
Mark Products
passive
passive
Natural
Frequency Damping
0.707
0.0083 Hz critical
0.707
0.0083 Hz critical
.707
0.033 Hz
critical
0.707
0.033 Hz
critical
0.707
critical
1.0 Hz
0.707
critical
1.0 Hz
0.707
critical
2.0 Hz
0.707
critical
4.5 Hz
0.707
40 Hz
critical
Sensitivity
1500 v/m/s
1500 v/m/s
2000 v/m/s
800 v/m/s
629 v/m/s
166.54
v/m/s
88 v/m/s
30.4 v/m/s
22.34 v/m/s
Spectral Amplitude
Response Characteristics
Equipment Inventory:
Broadband Seismometers
Guralp CMG-3T
Streckeisen STS-2
Equipment Inventory:
Intermediate Period
Seismometers
CMG-40T
30s active feedback
CMG-ESP
30s active feedback
Equipment Inventory:
Short Period Seismometers
L4C
1Hz
Teledyne GS-13
1Hz
1 Element/Housing
L22
2Hz
Passive Sensors
Streckeisen STS-2
•
•
•
•
Tri-Axial
120 Second
Low Power
1500 V/m/s
Streckeisen STS-2
Transformation
Equations

U 
2 /3 X
V
1/6 X  1/2 Y  1/3 Z
W
1/6 X  1/2 Y  1/3 Z

1/3 Z
East
X 
North Y 
Vertical Z 
2 /3 U  1/6 V  1/6 W
1/2 V  1/2 W
1/3 U

1/3 V  1/3 W
Transformation
Equations
X 
2 /3 U  1/6 V  1/6 W
1/2 V  1/2 W
Y
Z

1/3 U

1/3 V  1/3 W
Guralp CMG-3T
• 120 Second
• Low Power
• 1500 V/m/s
Guralp CMT-3T
Guralp CMG-3ESP
• 30 Second
• Low Power
• 2000 V/m/s
Guralp CMG-40T
•
•
•
•
30 Second
Low Power
800 V/m/s
No locking