3409 MACROSEISMIC SURVEY OF THE ML 4.4, 11 JUNE 2023 BOKSBURG EARTHQUAKE
Resumo
The Council for Geoscience (CGS) performed a macroseismic investigation on the earthquake that occurred in the Boksburg area on 11 June 2023. The event had a magnitude of ML4.4 and a focal mechanism that showed the event as having strike-slip motion along a NW-SE oriented fault. The event resulted in aftershocks, some of which were triggered on a neighbouring fault. Due to the size of the earthquake, an investigation was conducted to determine its impact on the community in and around the epicentral region. We followed a well-used and reliable methodology that the CGS and other organisations around the world use in all such investigations, where we conducted interviews and recorded reports from the public on questionnaires. Some questioannaires were also obtained from online submissions. The shaking caused by the earthquake was felt not only in the area near the epicentre, but almost all over Gauteng. The investigation highlighted a number of very interesting observations. For example, the observed wide-spread anomalous intensity values where higher ground motions than expected occurred. These anomalies should be further investigated in order to better understand the surface impact of earthquakes to better advise on disaster management and building codes.Publicado
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