Journal article
Paleoliquefaction in christchurch, New Zealand
SH Bastin, MC Quigley, K Bassett
Bulletin of the Geological Society of America | Published : 2015
DOI: 10.1130/B31174.1
Abstract
Liquefaction during the 2010 moment magnitude (Mw) 7.1 Darfield earthquake and large aftershocks (known as the Canterbury earthquake sequence) caused severe damage to land and infrastructure in Christchurch, New Zealand. Liquefaction occurred at Mw-weighted peak ground accelerations (PGA7.5) as low as 0.06g at highly susceptible sites. Trenching investigations conducted at two sites in eastern Christchurch enabled documentation of the geologic expressions of recurrent liquefaction and determination of whether evidence of pre-Canterbury earthquake sequence liquefaction is present. Excavation to water table depths (~1-2 m below surface) across sand blow vents and fissures revealed multiple gen..
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Funding Acknowledgements
We thank Martitia Tuttle, Peter Almond, and Pilar Villamor for their discussions and assistance that aided in the interpretation of these pre-Canterbury earthquake sequence liquefaction features. We also thank Matthew Hughes for his assistance with ArcGIS and Brendon Bradley for calculating the peak ground accelerations for the paleoearthquake events. This work was funded by an EQC Capability Fund and the University of Canterbury Mason Trust Fund.