The South Australian earthquake monitoring network is used to measure local earth movements (seismic activity) as well as record events from all around the world.
There are a number of stations located all around the State that record seismic activity which can be used to determine the location, magnitude, depth and duration of the event.
Recording Seismic Activity
The network can be subdivided in various ways.
Recorded data is in analogue or digital form. Analogue sites use pen and ink on paper, recording continuously onto a drum. Some of these can be seen at:
New digital sites around Adelaide record continuously.
Other digital sites in South Australia record in triggered mode. These run unattended, and at intervals the data are downloaded over the telephone network.
The station at Buckleboo (BBOO), owned by Geoscience Australia, runs in continuous digital mode and data can be downloaded from the internet.
The weak motion devices (seismometers) will record tiny earthquakes at great distance, but may go off scale if a large event happens nearby. Since these devices are extremely sensitive, the sensor is usually placed away from roads and homes, and the signal may be sent to a manned site by a low power UHF radio link.
Strong motion devices (accelerometers) will usually not record small or distant earthquakes, but rarely go off scale when a large event happens. The results are valuable for engineers.