Earthquakes in the Canberra Region - Geoscience Australia

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Earthquakes in the Canberra RegionFigure 7. Isoseismal map of the magnitude MD 1.2 Kambah earthquake of 3 December1990 (local date). The red triangle is the epicentre. Reported MM intensity values andisoseismal contours are shown.An earthquake in Evatt woke people at 1.29 am local time on 21 July 1991. It wasdescribed as sounding like an “explosion” and the “whole house shook”. The magnitudeof this microearthquake was MD 1.3. On the isoseismal map (Figure 8, compiled byMarion Leiba), the epicentre is shown as a triangle and the numbers are MM intensities.9
Earthquakes in the Canberra RegionFigure 8. Isoseismal map of the magnitude MD 1.3 Evatt earthquake of 21 July 1991(local date). The red triangle is the epicentre. Reported MM intensity values andisoseismal contours are shown; intensity values of 0 indicate the earthquake was not felt.At 7.34 pm local time on 10 August 1991, a small earthquake occurred under a horseracing stud at Burbong, 20 km ESE of the Canberra GPO. Having a magnitude of onlyMD 1.0, it was heard by the owners of the stud, but not felt. They thought it was blasting.Two events occurred under the suburb of Hawker, 10 km WNW of the GPO, on 28 July1993.at 9.53 and 10.00 pm Eastern Australian Standard Time. The magnitudes of theseevents were MD 1.3 and 1.4. The first earthquake was heard as a muffled explosion atHawker. People near the epicentre ran outside to investigate because they thought it mighthave been the work of a letterbox bomber who had been active there recently. The secondshook houses and rattled things, convincing residents that both events were indeedearthquakes and not the work of vandals! It was felt in the suburbs of Hawker, Scullin andHiggins but the intensity with which it was experienced varied from not felt to one reportof things being shaken off shelves. These two earthquakes were clearly related, the firstbeing a foreshock to the second.10
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Earthquakes in the Canberra Region - Geoscience Australia

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