Earthquake damage to residential buildings in South Iceland Rajesh Rupakhety Ragnar Sigbjörnsson

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Contents  The study area : Hveragerði  Hazard scenario: Peak Ground Acceleartion  Hazard scenario: Modified Mercalli Intensity (MMI)  Building vulnerability : Damage Probability Matrices  Damage factors: Spatially variable MMI  Damage factors: Constant MMI  Damage factors: ATC-13 DPM  Summary

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland The study area: Iceland

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland The study area: South Iceland Seismic Zone 17 June June May 2008

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: PGA

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: PGA Peak resultant acceleration is taken as the rotation-invariant measure of PGA M w 6.3, 2008 Ölfus Earthquake

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: MMI M w 6.3, 2008 Ölfus Earthquake

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Building vulnerability: Damage data Vulnerability Study of the South-Iceland Lowland Based on Data from the 2000 Earthquakes - Sólveig Thorvaldsdóttir, Rainrace for the 6th framework EU project FORESIGHT.

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Building vulnerability: Damage Probability Matrix Damage factor (%) Probability of a given damage factor for a given hazard intensity Modified Mercalli Intensity VVIVIIVIIIIX 0***** 0.5***** 5***** 20***** 45***** 80*****

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Building vulnerability: Damage Probability Matrices Damage factor (%) Probability of a given damage factor for a given hazard intensity Modified Mercalli Intensity VVIVIIVIIIIX 0***** 0.5***** 5***** 20***** 45***** 80***** Damage factor (%) Empirical probability distribution function 80 1 MMI VII

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Timber buildings Count: 454 Mean DF: 3.15 % Max DF: 75 % Std DF: 10 %

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Concrete buildings Count: 587 Mean DF: 4.37 % Max DF: 78 % Std DF: 11 %

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Masonry buildings Count: 97 Mean DF: 8.42 % Max DF: 78 % Std DF: 16 %

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI MaterialMean DF (%) Std DF (%) Concrete Timer Masonry All4.2611

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: Using constant MMI 8 and 9 Material Mean DF (%) Variable MMI Constant MMI VIII Constant MMI IX Concrete Timber Masonry All

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors : Comparison with ATC-13 Material Mean DF (%) PDM model based on Icelandic damage ratio data ATC 13 model Concrete Timber Masonry All

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Summary  Timber buildings show the best performance with a mean damage factor of 3.15 %  The simulation results show that the concrete buildings suffer a damage factor of 4.37 % on average  Masonry buildings show the worst performance with a mean damage factor of 8.42 %  ATC 33 damage probability matrices gave similar results as those obtained from damage data in South Iceland  Considering just one value of intensity for the whole town of Hverageði over-estimates the damage factor, almost by a factor of 2  Consideration of spatial variability of ground motion intensity gave results close to the actual damage observed after the M w 6.3, 2008 Ölfus Earthquake

UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Thank You !