Storegga Slide - NGI

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Risk EstimationDescription oftrigger mechanismsSoil conditionsStrongearthquakeonly realistictriggermechanismMajor slabslide?Sediment volumes notavailableNoYesDeep failuresurfacesSystemfrequencyRemoulded strength lowenough for failed volumeInstability< 4⋅10 -6 to flow away?Shallow failure Frequency Remoulded strength notSmallTsunami-generating? MajorconsequencesP < 10-2consequences10 -5 tsunami < 4 ⋅10 -8surfacelow enough for failedvolume to flow away?10 -5 No failureNo Ormen Lange activity affects stabilitywithin influence area 1⇒ By definition no major consequencesRetrogres-siveslide developsSufficient runout toreach fieldinstallations?P runout < 5 ⋅10 -3Mediumconsequences< 2 ⋅10 -8
Risk SummarySlide consequence class Description of slide Risk results(frequency per year)Comments1st party orenvironment3rd partyMajor:Slide generates tsunami thatcauses damage along thecoast.(3rd party, 1st party risk andenvironmental risk)Large regional slides related tothe glacial/ interglacial cycles.(Volume range 100 - 3000 km 3 )Slides from the back walls of theStoregga slide scar;retrogressive processNot relevantNotrelevantThe prehistoric Storegga slideremoved all soft sediments< 4·10 -8 Only natural causes (extremelystrong earthquakes).No project generated risk
Page 3 and 4: ScandpowerRisk Management ASP.O. Bo
Page 5: Location Map showing the Storegga S
Page 8 and 9: Risk Analysis Framework (NORSOK Sta
Page 10 and 11: Extent of Potential Influence Areas
Page 12 and 13: RAC (3rd Party Risk)• Normally no
Page 14 and 15: HAZID: Storegga SlideTrigger candid
Page 16 and 17: Storegga Slide - Explanation Model
Page 18 and 19: Storegga Slide - Explanation Model
Page 20 and 21: HAZID: Present Situation with Ormen
Page 22 and 23: Type of Slides
Page 26 and 27: Risk SummarySlide consequence class
Page 28: Summary• General risk analysis fr

Storegga Slide - NGI

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