b'Rapid deployment for aftershock monitoringFeaturenorth of the small community at Arthur River. However, theStrong ground motions recorded by the aftershock network, repair of the faulty monitoring equipment and the installationtogether with the SWAN sites, will contribute towards of the rapidly deployed instruments, the data collectedan improved understanding of earthquake impacts to between 10 January and 1 February enabled the SWAN teambuildings and infrastructure in southwest Western Australia to determine that the centre of the swarm was further south(e.g., Wehner et al, 2020) and will be used to guide future than previously estimated, and actually to the west of Arthurrevisions of the National Seismic Hazard Assessment (e.g., River (Figure 3). This shift likely reflects the increase in locationAllen etal., 2020). Outcomes from the SWAN project are precision brought about by the addition of the new temporaryintended to be used by DFES and GA to raise community sensors deployed. Aside from shifting many epicentresawareness of earthquake hazards and risks in the southwest southward, the higher-precision locations shifted initial depthWA region.estimates from 15-20 km to 0-5 km and reduced hypocentre uncertainty in all orientations by a factor of two or more. TheReferencesupdated epicentral locations are also now more consistent with the highest shaking intensities reported through GAs felt reportAllen, T., A. Carapetis, J. Bathgate, H. Ghasemi, T. Peji, and A. system (Allen etal., 2019). Moseley, 2019. Real-time community internet intensity In the first three weeks of the local deployment, Geosciencemaps and ShakeMaps for Australian earthquakes, Australian Australia recorded 94 events using only the ANSN. When theEarthquake Engineering Society 2019 Conference, Newcastle, rapid deployment data were analysed, over 950 earthquakesNew South Wales.were identified with magnitudes down to -0.3 in a tightAllen, T. I., J. D. Griffin, M. Leonard, D. J. Clark, and H. Ghasemi, 2020. cluster just west of Arthur River (Figure 4). The objective nowThe 2018 National Seismic Hazard Assessment of Australia: is to identify fault locations, and see if we can use these newquantifying hazard changes and model uncertainties, Earthq. earthquakes to improve our understanding of the local stressSpectra 36, 5-43, doi: 10.1177/8755293019900777.field and the seismic hazard of the area.Clark, D. J., S. Brennand, G. Brenn, M. C. Garthwaite, J. Dimech, T. I. Allen, and S. Standen, 2020. Surface deformation relating At the time of writing, the swarm is continuing with anotherto the 2018 Lake Muir earthquake sequence, southwest half dozen events being recorded on the ANSN per week.Western Australia: new insight into stable continental region Data from the second download is now being analysed andearthquakes, Solid Earth, 11, 691717, doi: 10.5194/se-11-will include waveforms from all SWAN stations, the rapid691-2020.deployment stations and an additional two stations thatDentith, M. C., and W. E. Featherstone, 2003. Controls on intra-have since been deployed by retired seismologists that haveplate seismicity in southwestern Australia, Tectonophys., 376, been sending real-time data to a private server. 167 184.Although there were many aspects of the rapid deploymentDoyle, H. A., 1971. Seismicity and structure in Australia, Bull. that were less than optimal, this project showed the importanceRoyal Soc. N.Z. 9, 149-152.of quickly deploying monitoring stations after sizableLeonard, M., 2008. One hundred years of earthquake recording earthquakes. It also and brought greater collaboration betweenin Australia, Bull. Seismol. Soc. Am., 98, 14581470, doi: all parties and will be the basis of building a regular capacity10.1785/0120050193.within WA for a rapid deployment capability without scientistsMurdie, R., K. Gessner, M. Miller, M. Salmon, H. Yuan, J. Whitney, having to fly across the country. S. Gray, and T. Allen, 2020. Geological Survey of Western Australia: SWAN takes off - a new seismic monitoring project in Western Australia, Preview 208, 28-29, doi: 10.1080/14432471.2020.1828423.Ninis, D., E. Borleis, M. Quigley, W. Peck, and J. Wilcox, 2021. The MW 5.9 Woods Point earthquake and aftershock sequence, Australian Earthquake Engineering Society 2021 Virtual Conference.Quigley, M., and J. La Greca, 2021. Reconnaissance survey of environmental and infrastructure damage from the September 2021 MW 5.9 Woods Point earthquake, Victoria, Australia, Earthquake Engineering Research InstituteAustralian Earthquake Engineering SocietyNew Zealand Society of Earthquake Engineering Joint Learning From Earthquakes Clearinghouse Woods Point, Australia Earthquake, 31 pp, http://learningfromearthquakes.Figure 4.A time-magnitude plot of the Arthur River swarm events showingorg/2021-09-22-australia/.the how number of events increased, particularly in the lower magnitude ranges,Wehner, M., H. Ryu, M. Griffith, M. Edwards, N. Corby, I. Mohanty, once the local monitoring network was installed. Note these are preliminaryJ. Vaculik, and T. Allen , 2020. Earthquake mitigation of WA magnitudes have been generated by the machine learning algorithm and areregional towns York case study: final report, Bushfire and slightly different from those reported by Geoscience Australia. Natural Hazards CRC Report TBC, 190 pp.41 PREVIEW APRIL 2022'