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The 20<\/SPAN>22<\/SPAN> <\/SPAN>liquefaction and lateral spreading vulnerability zones for Glenorchy, <\/SPAN>prepared by <\/SPAN>Tonkin + Taylor <\/SPAN>(T+T) <\/SPAN>under contract to Otago Regional Council (ORC)<\/SPAN>.<\/SPAN>This corresponds to Appendix A of the report titled \"Glenorchy Liquefaction Vulnerability Assessment\" prepared by T+T for ORC, dated 26th May 2022 (T+T Ref: 1017916).<\/SPAN><\/P>

This dataset <\/SPAN>comprises a classification of liquefaction <\/SPAN>vulnerability following the methodology given in the MBIE/MfE guidelines (2017), as well as a classification of lateral spreading vulnerability.<\/SPAN> The vulnerability assessment uses 100-year, 500-year return period events as determined using Module 1 of the Guidelines for earthquake geotechnical engineering practice in New Zealand (NZGS & MBIE 2021), as well as an Alpine Fault Rupture Scenario (with a return period of approximately 30-years).<\/SPAN><\/P>

There are five vulnerability levels used in this dataset:<\/SPAN><\/P>

1. Low Liquefaction Vulnerability: There is a probability of more than 85 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking.<\/SPAN>2. Medium Liquefaction Vulnerability: There is a probability of more than 50 percent that liquefaction-induced ground damage will be: Minor to Moderate (or less) for 500-year shaking; and None to Minor for 100-year shaking. <\/SPAN>3. High Liquefaction Vulnerability: There is a probability of more than 50 percent that liquefaction-induced ground damage will be: Moderate to Severe for 500-year shaking; and/or Minor to Moderate (or more) for 100-year shaking. There is no considered to be a significant risk of lateral spreading damage.<\/SPAN>4. High Liquefaction Vulnerability and Major Lateral Spreading Vulnerability: As for category (3), but with a significant risk of major lateral spreading damage (>100mm) in a 500-year shaking event.<\/SPAN>5. High Liquefaction Vulnerability and Severe Lateral Spreading Vulnerability: As for category (3), but with a significant risk of severe lateral spreading damage (>500mm) in a 500-year shaking event.<\/SPAN><\/P>

Reference<\/SPAN>s<\/SPAN>:<\/SPAN><\/P>

MBIE & MfE. (2017). Planning and Engineering Guidance for Potentially Liquefaction-prone Land. Wellington: New Zealand Ministry of Business, Innovation and Employment, Building System Performance Branch.<\/SPAN><\/P>

NZGS & MBIE. (2021). Earthquake geotechnical engineering practice, Module 1: Overview of the Guidelines. 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