2 the strong motion packet, 3 viewing packets – Guralp Systems Strong Motion User Manual
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Güralp Systems Ltd.
3.2 The Strong Motion Packet
The strong motion packet contains calculated strong motion
data in floating point format. The data is in ground units (gal,
kine, etc.) and requires an accurate infoblock is uploaded to the
digitiser (the infoblock stores the calibration values of the ADC
and the analogue sensor components).
An example strong motion block:
0000000000245B5B | LW-A830/Port A/loc | 2008-03-12T12:47:58.000Z
| LW -A830SM | unknown | strong motion | 50 words
| Windowed MMA | 0Z | -4.09785 -4.09660 -4.10911
| Windowed MMA | 0N | -4.19176 -4.18925 -4.19427
| Windowed MMA | 0E | -4.43434 -4.43434 -4.44563
| Windowed MMA | 0h | 6.10199 6.10026 6.11192
| Windowed MMA | 0a | 7.35028 7.34815 7.36480
| PGA | 0Z | 0.0125049
| PGA | 0N | 0.00502158
| PGA | 0E | 0.0112897
| PGA | 0h | 0.0123561
| PGA | 0a | 0.0175797
| RMS | 0Z | 0.0113237
| RMS | 0N | 0.00376618
| RMS | 0E | 0.0125441
| RMS | 0h | 0.0130973
| RMS | 0a | 0.0173137
| SI | 0Z | 0.615240
| SI | 0N | 0.628953
| SI | 0E | 0.663583
| SI | 0h | 0.914289
| SI | 0a | 1.10202
3.3 Viewing Packets
On a CMG-DCM or CMG-NAM unit that is connected to a strong
motion data source, the packet contents may be viewed with
the following terminal commands:
●
dumpstatus – shows unified status blocks.
●
dumpsm – shows strong motion blocks.
●
dumpdata – shows a summary of all incoming data blocks,
but not their contents.
Scream or a CMG-DCM or CMG-NAM will record all GCF blocks,
including strong motion and unified status, to disk. See the
page
for details on interpreting these blocks in
your own programs.
July 2008
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