Earthquakes in the Canberra Region - Geoscience Australia
Earthquakes in the Canberra Region - Geoscience Australia
Earthquakes in the Canberra Region - Geoscience Australia
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<strong>Earthquakes</strong> <strong>in</strong> <strong>the</strong> <strong>Canberra</strong> <strong>Region</strong>It is clear that <strong>the</strong> average activity dur<strong>in</strong>g <strong>the</strong> period 1996 to November 2007 is <strong>the</strong> lowest<strong>in</strong> more than 45 years, but three earthquakes with magnitude ML greater than 3.0happened <strong>in</strong> <strong>the</strong> first eight months of 2006. This may be a random fluctuation or may<strong>in</strong>dicate an <strong>in</strong>crease <strong>in</strong> seismic activity.The seismograms recorded from <strong>the</strong> magnitude ML 3.3 Oolong earthquake of 13 August2006 are shown <strong>in</strong> Figure 16. These were recorded by <strong>Geoscience</strong> <strong>Australia</strong>’s digitalseismographs at <strong>Canberra</strong>, Young, Riverview (at Lane Cove, Sydney) and MangroveCreek The record<strong>in</strong>g on <strong>the</strong> Kambah seismograph is shown <strong>in</strong> Figure 4b. This earthquakewas felt widely and <strong>the</strong> felt reports are summarised below.Dalton: A loud noise. W<strong>in</strong>dows and small objects rattled. People felt it and wereawakened. Dogs were frightened. There was a report of slight plaster crack<strong>in</strong>g.Gunn<strong>in</strong>g: Felt by all <strong>in</strong> community and woke people. Dogs barked. Loud doublebarrelledbang and a stone house jerked. One person said it was <strong>the</strong> loudest bang <strong>in</strong> 30years, w<strong>in</strong>dows rattled, doors banged, and <strong>the</strong>re were a couple of new small cracks (<strong>in</strong>w<strong>in</strong>dows?).Goulburn: Felt by several people, shelves rattled, ornaments toppled.Yass: Awakened and felt by all <strong>in</strong> house. Very low-frequency rumble that lasted 30-45seconds.Murrumbateman: Felt by very few. Rumble lasted about 15 seconds. Slight rattle.Ngunnawal ACT: Felt by one person <strong>in</strong> house. Sound similar to thunder. W<strong>in</strong>dowsrattled slightly. Small copper bucket full of baby bath items vibrated.Kambah ACT: Child woken some time after 11 pm – an unusual occurrence. W<strong>in</strong>dowsrattled.Cowra: W<strong>in</strong>dows rattled some time dur<strong>in</strong>g <strong>the</strong> period 11.30 pm – 12.30 am.25