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Liquefaction Vulnerability Study


Cover of Liquefaction Vulnerability Study.

Published March 2013

EQC has engaged Tonkin & Taylor to undertake a study to determine a method for predicting where liquefaction-related damage is likely to occur in future seismic events in Canterbury. 

Purpose of the study

Land that has become more vulnerable to future damage as a result of ground surface subsidence from the Canterbury earthquakes may be covered by EQC, depending on the degree of increased vulnerability.

To help establish which land has increased vulnerability, Tonkin & Taylor has undertaken this study for EQC to determine a suitable method for measuring vulnerability to liquefaction damage (i.e. predicting where liquefaction related damage is likely to occur as a result of future seismic events in Canterbury).

Download main report

Liquefaction Vulnerability Study (PDF, 1.2 MB)

Download appendices to the report

Appendix A: Figures

Appendix B: CPT Liquefaction triggering method and multiple earthquake modelling

Appendix C: Groundwater modelling methodology

Appendix D: Individual CPT analyses

Appendix E: Interpolation

Appendix F: Earthquakes - maps

Appendix G: Main earthquakes - graphs and analysis

Appendix H: Calculated settlement indicator maps

Appendix I: LSN Maps

Appendix J: Calculated settlement indicator and LSN graphs

Appendix K: Observed Liquefaction performance at approximately 100 year PGA

Appendix L: Groundwater sensitivity

Appendix M: Avonside study area – lateral spreading

Appendix N: LSN Examples


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