Authors / CoAuthors
Scala, A. | Lorito, S. | Romano, F. | Murphy, S. | Selva, J. | Basili, R. | Babeyko, A. | Herrero, A. | Hoechner, A. | Lovholt, F. | Maesano, F.E. | Perfetti, P. | Tiberti, M.M. | Tonini, R. | Volpe, M. | Davies, G. | Festa, G. | Power, W. | Piatanesi, A. | Cirella, A.
Abstract
The complexity of coseismic slip distributions influences the tsunami hazard posed by local and, to a certain extent, distant tsunami sources. Large slip concentrated in shallow patches was observed in recent tsunamigenic earthquakes, possibly due to dynamic amplification near the free surface, variable frictional conditions or other factors. We propose a method for incorporating enhanced shallow slip for subduction earthquakes while preventing systematic slip excess at shallow depths over one or more seismic cycles. The method uses the classic k-2 stochastic slip distributions, augmented by shallow slip amplification. It is necessary for deep events with lower slip to occur more often than shallow ones with amplified slip to balance the long-term cumulative slip. We evaluate the impact of this approach on tsunami hazard in the central and eastern Mediterranean Sea adopting a realistic 3D geometry for three subduction zones, by using it to model * 150,000 earthquakes with Mw from 6.0 to 9.0. We combine earthquake rates, depth-dependent slip distributions, tsunami modeling, and epistemic uncertainty through an ensemble modeling technique. We found that the mean hazard curves obtained with our method show enhanced probabilities for larger inundation heights as compared to the curves derived from depth-independent slip distributions. Our approach is completely general and can be applied to any subduction zone in the world.
Product Type
document
eCat Id
127130
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Digital Object Identifier
Keywords
-
- Tsunamis
-
- seismic-probabilistic tsunami hazard assessment
-
- tsunami source models
-
- stochastic seismic slip distributions
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
-
- Published_External
Publication Date
2019-07-08T01:43:30
Creation Date
Security Constraints
Legal Constraints
Status
completed
Purpose
Journal publication (GA is a minor author)
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
not supplied
Parent Information
Extents
[31, 45, 5, 40]
Reference System
Spatial Resolution
Service Information
Associations
Source Information