Spatial variation of magnitude scaling factors during the 2010 Darfield and 2011 Christchurch,New Zealand,earthquakes |
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| Institution: | 1. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA;2. Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;3. Department of Civil and Environmental Engineering, University of Auckland, Auckland, New Zealand;1. National Institute for Earth Physics, 12 Calugareni, 077125 Magurele, Ilfov, Romania;2. Bogazici University, Kandili Observatory and Earthquake Research Institute, Department of Earthquake Engineering, Cengelkoy, Uskudar, 34684 Istanbul, Turkey;1. Department. of Civil Engineering Educators, School of Pedagogical & Technological Education (ASPETE), Athens, Greece;2. Atkins, The Axis, 10 Holliday Street, Birmingham, United Kingdom;3. Office of Special Services, Ministry of Infrastructure and Transport, Athens, Greece;4. Civil Engineer, Patras, Greece;5. Department of Civil Engineering, University of Patras, Patras, Greece |
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| Abstract: | The combination of well-documented liquefaction response during the Darfield and Christchurch, New Zealand, earthquakes, densely-recorded ground motions for the events, and detailed subsurface characterization provides an unprecedented opportunity to investigate the significance of the spatial variation of magnitude scaling factors (MSF) on liquefaction triggering. Towards this end, MSF were computed at 15 SMS sites across Christchurch and its surroundings using two established approaches. Trends in the spatial variation of the MSF computed using number of equivalent cycles (neq) from both approaches were similar, with the spatial variation being more significant for the Christchurch earthquake than the Darfield earthquake. However, there was no consistent trend for regions with lower computed MSF having experienced more severe or widespread liquefaction. Additionally, there is a general correlation between MSF and amax, but because amax ranges more widely than MSF it has a greater influence on the resulting seismic demand imposed on the soil than MSF does. Nevertheless, the spatial variation of the MSF is deemed significant enough that it warrants being considered for incorporation into future variants of simplified liquefaction evaluation procedures. |
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| Keywords: | Liquefaction Magnitude scaling factors Christchurch Canterbury earthquakes |
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