Probabilistic seismic landslide hazard maps including epistemic uncertainty

Abstract Seismic landslide hazard maps are used in regional planning to identify zones that require detailed, site-specific studies. Most seismic landslide hazard maps are based on predicted sliding block displacements for a given level of shaking, but this deterministic approach does not fully consider the aleatory variability in the sliding displacement prediction or the epistemic uncertainty in the soil and slope properties. Probabilistic approaches incorporate aleatory variability through a sliding displacement hazard curve and they incorporate epistemic uncertainties (e.g., soil shear strength, empirical displacement model) through a logic-tree approach. This fully probabilistic approach can be implemented efficiently on a regional scale for seismic landslide hazard maps using ground motion hazard data and the Mean λD Threshold approach. This paper applies the probabilistic approach to develop a seismic landslide hazard map for Anchorage, Alaska. The results show that incorporating epistemic uncertainty can increase the area of high seismic landslide hazard by a factor of 2 to 3 as compared to analyses without any epistemic uncertainty. Additionally, incorporating a logic-tree avoids using overly conservative input parameters in a deterministic approach to capture these uncertainties, which can lead to an unrealistic inflation of the seismic landslide hazard.

[1]  Gokhan Saygili,et al.  Probabilistically based seismic landslide hazard maps: An application in Southern California , 2009 .

[2]  N. Newmark.  Effects of Earthquakes on Dams and Embankments , 1965 .

[3]  Gokhan Saygili.  A probabilistic approach for evaluating earthquake-induced landslides , 2008 .

[4]  Jack W. Baker.  Correlation of ground motion intensity parameters used for predicting structural and geotechnical response , 2007 .

[5]  Randall W. Jibson,et al.  Methods for assessing the stability of slopes during earthquakes—A retrospective , 2011 .

[6]  Alberto Refice,et al.  Probabilistic modeling of uncertainties in earthquake-induced landslide hazard assessment , 2002 .

[7]  E. Rathje,et al.  Influence of Input Motion and Site Property Variabilities on Seismic Site Response Analysis , 2010 .

[8]  Paolo Bazzurro,et al.  Vector-valued Probabilistic Seismic Hazard Analysis , 2001 .

[9]  Jonathan D. Bray,et al.  Simplified Procedure for Estimating Earthquake-Induced Deviatoric Slope Displacements , 2007 .

[10]  Claudia Cherubini,et al.  Reliability evaluation of shallow foundation bearing capacity on c', Φ' soils , 2000 .

[11]  B. Bradley.  A generalized conditional intensity measure approach and holistic ground‐motion selection , 2010 .

[12]  Paolo Bazzurro,et al.  Probabilistic seismic demand analysis , 1998 .

[13]  D. Keefer,et al.  Three-Point Approximations for Continuous Random Variables , 1983 .

[14]  Charles S. Mueller,et al.  Documentation for the 2008 update of the United States National Seismic Hazard Maps , 2008 .

[15]  K. Phoon,et al.  Characterization of Geotechnical Variability , 1999 .

[16]  J. Egan,et al.  A model for earthquake-induced translatory landslides in Quaternary sediments , 1988 .

[17]  R. Jibson,et al.  Maps Showing Seismic Landslide Hazards in Anchorage, Alaska , 2009 .

[18]  R. Jibson.  Regression models for estimating coseismic landslide displacement , 2007 .

[19]  E. Rathje,et al.  The influence of different simplified sliding-block models and input parameters on regional predictions of seismic landslides triggered by the Northridge earthquake , 2013 .

[20]  Gokhan Saygili,et al.  Probabilistic Seismic Hazard Analysis for the Sliding Displacement of Slopes: Scalar and Vector Approaches , 2008 .

[21]  D. Keefer,et al.  Investigating Landslides Caused by Earthquakes – A Historical Review , 2002 .

[22]  R. Combellick.  Simplified Geologic Map and Cross Sections of Central and East Anchorage, Alaska , 1999 .

[23]  E. Harp,et al.  A method for producing digital probabilistic seismic landslide hazard maps , 2000 .

[24]  Gokhan Saygili,et al.  Empirical Predictive Models for Earthquake-Induced Sliding Displacements of Slopes , 2008 .

[25]  Gokhan Saygili,et al.  Probabilistic assessment of earthquake-induced sliding displacements of natural slopes , 2009 .

[26]  Julian J. Bommer,et al.  The Use and Misuse of Logic Trees in Probabilistic Seismic Hazard Analysis , 2008 .