Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

284 PATA Days 2024 PFE, respectively. A third faulting event (III) is recognised from a fault parallel trough with infill sediments. Event III has a minimum date of 1209 ± 20 yr BP and maximum bounding dates from Pit 0; giving a range for Event III of 889-1405 CE. A fourth possibly older event is defined by upward-terminating faults in a basal, mid-Holocene unit that has been truncated, presumably following river avulsion and terrace degradation. colluvium across the scarp is unfaulted. Two charcoal dates from this colluvium and a second faulted colluvium are closely matched, yielding maximum age ranges of 1490-1838 and 1430-1461 CE. for the MRE and PFE, respectively. A third faulting event (III) is recognised from a fault parallel trough with infill sediments. Event III has a minimum date of 1209 ± 20 yr BP and maximum bounding dates from Pit 0; giving a range for Event III of 889-1405 CE. A fourth possibly older even is d fined by upward-terminating faults in a basal, mid-Holocene unit that has been truncated, presumably following river avulsion and terrace degradation. Figure 3: Simplified logs for: A) Trench 1; and B) Trench 2, at Marble Hill. Radiocarbon (black) and IRSL (green) dates. PALEOEARTHQUAKE PROXY DATA In the Springs Junction area, paleoearthquake data also comes from off-fault proxy insights. Mackereth coring within Lake Christabel, a landslide-dammed lake situated in the hangingwall of the Alpine Fault has revealed 3-4 significant Late Holocene turbidite deposits (Howarth et al., 2016). These turbidites are considered to have been triggered by very strong shaking during Alpine Fault earthquakes. The turbidite events are precisely bracketed from AMS dating of leaf macrofossils. Ages for these four turbidites are 102- Fig. 3: Simplified logs for: A) Trench 1; and B) Trench 2, at Marble Hill. Radiocarbon (black) and IRSL (green) dates. PA L E O E A R T H Q U A K E P R O X Y D ATA In the Springs Junction area, paleoearthquake data also comes from off-fault proxy insights. Mackereth coring within Lake Christabel, a landslide-dammed lake situated in the hangingwall of the Alpine Fault has revealed 3-4 significant Late Holocene turbidite deposits (Howarth et al., 2016). These turbidites are considered to have been triggered by very strong shaking during Alpine Fault earthquakes. The turbidite events are precisely bracketed from AMS dating of leaf macrofossils. Ages for these four turbidites are 102- 183, 502-545, 945-1010, and 1309-1354 cal yr BP (Langridge and Howarth, 2018). is is the longest precise paleoearthquake record along the AF-NS, and the average