Layer: 2022 ORC Glenorchy Liquefaction Vulnerability and Lateral Spreading Ground Damage Areas (ID: 6)

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Name: 2022 ORC Glenorchy Liquefaction Vulnerability and Lateral Spreading Ground Damage Areas

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV>The 2022 liquefaction and lateral spreading vulnerability zones for Glenorchy, prepared by Tonkin + Taylor (T+T) under contract to Otago Regional Council (ORC).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).This dataset comprises a classification of liquefaction vulnerability following the methodology given in the MBIE/MfE guidelines (2017), as well as a classification of lateral spreading vulnerability. 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).There are five vulnerability levels used in this dataset: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.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. 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.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.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.References: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.NZGS & MBIE. (2021). Earthquake geotechnical engineering practice, Module 1: Overview of the Guidelines. Wellington: New Zealand Geotechnical Society and Ministry of Business, Innovation and Employment. </DIV></DIV></DIV>

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Copyright Text: Copyright Otago Regional Council 2022

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