Increasing volumes of palaeoseismological evidence suggest that the occurrence of large earthquakes on individual faults in low seismicity regions is clustered in time. Faults appear to have a few large earthquakes in a relatively short period of time followed by long periods of quiescence. Such behaviour is not explained by the standard model of elastic rebound theory, where strain accumulates on faults due to constant loading before being released in an earthquake, leading to quasi-periodic behaviour. Instead, faults may interact within a system where geometrical complexity and transient stress changes lead to aperiodic earthquake occurrence on individual faults within the system. It is further hypothesised that such behaviour may be more pervasive than previously thought, even in seismically active regions. The concept of a ‘return period’ for earthquakes on individual faults may be limited to mature, geometrically isolated plate boundary faults such as the Alpine Fault.
This talk will present preliminary research into episodic earthquake occurrence, with the goal of developing a multi-disciplinary time-dependent model of earthquake occurrence for the Otago region. This talk forms a component of Jonathan Griffin’s PhD program at the University of Otago.
|Date||Wednesday, 3 October 2018|
|Time||1:00pm - 2:00pm|
|Location||Benson Common Room (Gn9), Geology Building, 360 Leith Street, Dunedin|