Kinemetrics
has successfully implemented a national telemetry
network for the Meteorological Service of Singapore
(MSS) with stations in a number locations around
the island.
MSS is a department of the Ministry of Communications and provides weather
information and forecasts to support Singapore's national needs. Besides weather,
it also provides the public with warnings on heavy rainfall and floods, smoke
haze, lightning risks, and earthquake and astronomical information.
According to Mr. Lim Tian Kuay, head of research and development for MSS, the
department launched the project last year in order to gather more up-to-date
information on earthquake movements in the region and to contribute to regional
monitoring programs in Asia.
Seismic Station
The seismic system provides remote monitoring of regional seismic activities
around Singapore, particularly the area over Sumatra and other Indonesian regions.
Using Kinemetrics and Quanterra data acquisition, storage and telemetry equipment,
digitally recorded seismic measurements at remote sites are stored and then
transmitted to the Central Processing Station (CPS) at MSS for further processing
and dissemination.
System Components
The complete installation is a seven-seismic-station network with data telemetered
to a central recording station via telephone lines. The network includes four
seismograph stations supplied by Kinemetrics, one global seismograph station
supplied by Quanterra, two ground motion stations and a central station supplied
by Kinemetrics. At the central recording station, the signals from continuous
or triggered recording are analyzed and the event is automatically calculated
for magnitude and location.
Monitoring Stations
Seismograph Stations
Kinemetrics WR-1 seismometers at each site transduce vertical and horizontal
ground motions into an electrical signal that is proportional to velocity.
Global Seismographic Network Station (GSN)
The GSN consists of Strekeisen STS-2 very-broad-band, very-short-period seismometers
and Kinemetrics FBA-23 accelerometers.
Ground Motion Stations
The ground motion stations contain Kinemetrics' WR-1 seismometers, FBA-23 accelerometers
and FBA-23DH downhole packages at each site.
All the recorded signals at the stations are fed to their own K2 recorders
where the signals are digitized and telemetered in real time to the central
receiving station via a dedicated phone line. If a signal exceeds a predetermined
threshold, in addition to being telemetered, it will also be recorded and an
earthquake alert will be sent via a dial-up phone line.
Central Processing System
The central processing system includes the Central Recording System (CRS),
the Seismic Data Analysis System (SDAS), and a warning system.
At the CRS, signals telemetered from the field site are received via telephone
line and continuously recorded. The CRS provides central file storage. Raw
and processed waveform and parametric files for all connected nodes are stored
on the file server where they are accessible to all other nodes.
The SDAS analyses the recorded data with widely-used seismological software
that allows MSS to exchange data and results with the seismological research
community.
The SDAS:
- Performs data acquisition and analysis, including
real-time data acquisition
- Wave arrival selection
- Calculations
- Displays displacement spectra of a selected
seismogram
- Performs attenuation analysis
- Earthquake location function
- Interactive analysis of seismic time
series using fundamental display and processing
operations and digital seismic processing
The central processing system also
includes a warning system that can provide a warning
signal to interested parties via telefax or electronic
mail. |
