fe8bbf33-06c8-4454-bbf3-fac759f734c6 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T19:03:38 creation ISO 19115 2016 Depth phases from local earthquakes fe8bbf33-06c8-4454-bbf3-fac759f734c6 Synthetic seismogram modelling and observations suggest that depth phases from local crustal earthquakes are of the type sX , where X stands for Pg, Pn , and the reflections from the crust-mantle boundary , mainly PMP and SMS. Depth phases of the type pX generally have much smaller amplitudes and are unlikely to stand out in seismograms . The differential times sX-X provide a very good control of focal depth. Examples of earthquakes that occurred in May and June 1991 in an area northwest of Kempsey (New South Wales) and in September 1991 near St George (Queensland) indicate that their foci were in the uppermost crust, at depths of between 2 and 3 km Earth Sciences GA Publication Journal Published_External Journal article (pdf) documentDigital Journal article (pdf) PDF Unnamed resource documentDigital HTML