Storegga Slide - NGI

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Risk Analysis Framework (NORSOK Standard Z-013)Risk analysis planningRisk acceptance criteriaSystem definitionHazard identificationRisk reduction measuresConsequenceanal ysisFrequencyanalysisRisk estimationRiskanalysisRisk pictureRisk evaluationunacceptableRisk assessmentacceptableFurther risk reduction measuresPart of safety management and risk control
Risk Analysis PlanningSTOREGGA MODELUnderstanding of/mostlikely explanation of theStoregga SlideHAZARD IDENTIFICATION(trigger mechanisms):Shear stress increasingfactors---Shear strength decreasingfactors---ACCIDENT MODELLINGParametric studies to identifymost likely combination oftrigger mechanismsIDENTIFICATION OFSEDIMENT SOURCEAREAS FOR MAJOR &MEDIUM SLIDES IN THEORMEN LANGEINFLUENCE AREA.Influence areas determinedby potential effect ofOrmen Lange activities:- Reservoir subsidence- Underground blowout- Hydrate melting- Anchor forces- Rock fills- TrenchingPOTENTIAL TRIGGERMECHANISMS FORSLIDES CAUSED BYORMEN LANGEACTIVITIES.- Reservoir subsidence- Underground blowout- Hydrate melting- Anchor forces- Rock fills- TrenchingThe Storegga slideMajor slides todaySmall slidesCONSEQUENCE MODEL(3rd PARTY):RISKofSUB SEA SLIDESTSUNAMISize and mass/velocityrelationships and impactdistance from slide. Findminimum parameters tocause 3rd party fatalities.Major slides(Tsunami)MediumslidesSmall slides
Page 3 and 4: ScandpowerRisk Management ASP.O. Bo
Page 5: Location Map showing the Storegga S
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 24 and 25: Risk EstimationDescription oftrigge
Page 26 and 27: Risk SummarySlide consequence class
Page 28: Summary• General risk analysis fr

Storegga Slide - NGI

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