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Images for quake city; more images...

Images, eqnz.chch.2010

Photos taken in Spreydon Library on April 15 following the February 22 earthquake. File reference: CCL-2011-04-08-Spreydon-After-The-Earthquake-IMG_0463 From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken in Spreydon Library on April 15 following the February 22 earthquake. File reference: CCL-2011-04-08-Spreydon-After-The-Earthquake-IMG_0469 From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken in Spreydon Library on April 15 following the February 22 earthquake. File reference: CCL-2011-04-08-Spreydon-After-The-Earthquake-IMG_0468 From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken in Spreydon Library on April 15 following the February 22 earthquake. File reference: CCL-2011-04-08-Spreydon-After-The-Earthquake-IMG_0470 From the collection of Christchurch City Libraries

Research papers, University of Canterbury Library

We present ground motion simulations of the Porters Pass (PP) fault in the Canterbury region of New Zealand; a major active source near Christchurch city. The active segment of the PP fault has an inferred length of 82 km and a mostly strike-slip sense of movement. The PP fault slip makes up approximately 10% of the total 37 mm/yr margin-parallel plate motion and also comprises a significant proportion of the total strain budget in regional tectonics. Given that the closest segment of the fault is less than 45 km from Christchurch city, the PP fault is crucial for accurate earthquake hazard assessment for this major population centre. We have employed the hybrid simulation methodology of Graves and Pitarka (2010, 2015), which combines low (f<1 Hz) and high (f>1 Hz) frequencies into a broadband spectrum. We have used validations from three moderate magnitude events (๐‘€๐‘ค4.6 Sept 04, 2010; ๐‘€๐‘ค4.6 Nov 06, 2010; ๐‘€๐‘ค4.9 Apr 29, 2011) to build confidence for the ๐‘€๐‘ค > 7 PP simulations. Thus far, our simulations include multiple rupture scenarios which test the impacts of hypocentre location and the finite-fault stochastic rupture representation of the source itself. In particular, we have identified the need to use location-specific 1D ๐‘‰๐‘ /๐‘‰๐‘ models for the high frequency part of the simulations to better match observations.