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Much of the seismicity in southwest WA occurs in localised groups of recurring earthquakes, or clusters. Four potential cluster sites have been identified in the Great Southern Region of WA in the period January to November 2019. A group near Newdegate contained the largest event of the year (ML 4.3), and it is suggested these events belong to an e...
Context in source publication
Context 1
... G is 33-34 degrees south, and zone H is 34 to 35 degrees south. Five cluster locations have so far been identified in zone G and one in zone H, as shown in Table 1, and plotted on Figure 1. These locations are the assumed centres of reasonably well-defined groups of earthquakes in the past 6 years, and it is suggested that the locations may also be the focus of future activity. ...Similar publications
A significant series of earthquakes occurred near Burakin in the northern WA wheat belt between September 2001 and June 2002, including three ML 5 events. Geoscience Australia (GA) deployed up to 15 field seismographs in the area at various times in that period to provide better earthquake locations, but a detailed review of the data has not been p...
Citations
Earthquake clustering has long been noted as a significant feature of the seismicity of southwest Western Australia. The cluster locations are of significance because they are sites of repeating seismicity for over a decade or more. Fifty-one cluster centres have been previously defined, mostly from seismicity during the 2012-2017 period. Seismicity during 2017-2020 is reviewed here, resulting in the identification of 28 cluster centres active during this period. Of these, 14 had been active prior to 2017 and 14 are new. The most significant of these were northwest of Beacon, representing ongoing activity, and north of Ravensthorpe, which is a new location. The cluster centres in southwest Western Australia appear to define a NNW trend, as has been noted in earlier studies, and may correlate with the granitoid components of the geology in that region of the Yilgarn craton. The northern region of the study area has more cluster locations than the southern region, which is consistent with earlier studies of the seismicity of the region.
