Earthquakes in the Canberra Region - Geoscience Australia

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Earthquakes in the Canberra RegionA magnitude ML 2.4 earthquake, the largest in metropolitan Canberra during this period,occurred at 7.51 am Eastern Australian Summer Time on 29 November 1985. Theepicentre, shown in Figure 5, was in the Turner-Black Mountain area, where theearthquake was felt strongly. The numbers on the map are intensities on the ModifiedMercalli (MM) Scale (Appendix 1).Figure 5. Isoseismal map of the Canberra earthquake, magnitude ML 2.4, of 29November 1985 (local date). The red triangle is the epicentre. Reported MM intensityvalues and isoseismal contours are shown; intensity values of 0 indicate the earthquakewas not felt.At 2.07 am Eastern Australian Summer Time on 3 December 1990 a very smallearthquake occurred under the western part of Kambah. It was well recorded (Figure 6)on the Kambah seismograph, KBH, 3 km from the epicentre. An appeal made through thelocal media, who were quite excited by this small earthquake (Michael-Leiba, 1990),resulted in felt reports that are plotted on the isoseismal map (Figure 7) in MM intensityunits.7
Earthquakes in the Canberra RegionFigure 6. Seismogram of the Kambah earthquake of 3 December 1990 (local date). TheKambah seismograph that recorded this was 3 km from the epicentre.The three observers nearest to the earthquake described it as an explosion which shook thehouse, or an enormous bang. The other three Kambah observers were about 3 km fromthe epicentre. One awoke suddenly, another experienced a deep huge boom which wentright through her body, and the third was disturbed by his dog howling (a very unusualoccurrence for this geriatric Pekingese) half to one minute before he felt a shudder. Themagnitude of this earthquake is only MD 1.2. MD is the duration magnitude, anapproximation for the Richter magnitude ML derived from the maximum amplitude of theoscillations on the seismogram.8
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Earthquakes in the Canberra Region - Geoscience Australia

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