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SUMMARY
The work described in this report was part of the BMR contribution to the
1984 Australian National Antarctic Research Expeditions at Mawson.
This
contribution consisted of continuous recording of seismic activity and the
geomagnetic field.
The geomagnetic field was recorded using a normal La Cour magnetograph
(recording H, D, and Z components photographically) for the entire year. In May,
a two component (X and Y) Photo-electric Magnetometer (PEM) was connected to a
digital recorder (an EDAS unit utilizing a magnetic cassette drive) and a visual
multichannel chart recorder.
Seismic activity was recorded using a Benioff short period seismograph and a
Press-Ewing long period seimograph onto two hot pen helicorders. In addition two
Benioff short period horizontal seismometers recorded activity on a photographic
drum recorder until the photographic system was disconnected in May 1984.
The
seismometers were relocated and connected to the visual recording system in
February 1985.
Preliminary magnetic data were forwarded monthly to Australia. Preliminary
seismic data were forwarded weekly to Australia and all Antarctic geophysical
stations. In addition, special seismic data were forwarded daily to Australia
and all other International Data Centres during the Group of Scientific Experts
Technical Test (nuclear monitoring) from September to December.