Earthquake source parameters along the Hellenic subduction zone and numerical simulations of historical tsunamis in the Eastern Mediterranean

2012 ◽  
Vol 536-537 ◽  
pp. 61-100 ◽  
Author(s):  
Seda Yolsal-Çevikbilen ◽  
Tuncay Taymaz
Keyword(s):  
Numerical Simulations ◽  
Subduction Zone ◽  
Eastern Mediterranean ◽  
Source Parameters ◽  
Earthquake Source ◽  
Hellenic Subduction Zone ◽  
Earthquake Source Parameters ◽  
Historical Tsunamis

The Sensitivity of Tsunami run-up to Earthquake Source Parameters and Manning Friction Coefficient in High-Resolution Inundation Simulations

2021 ◽  
Author(s):  
Steven J. Gibbons ◽  
Stefano Lorito ◽  
Marc de la Asunción ◽  
Manuela Volpe ◽  
Jacopo Selva ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
High Resolution ◽  
Numerical Simulations ◽  
Source Parameters ◽  
Tsunami Hazard ◽  
Earthquake Source ◽  
Earthquake Sources ◽  
Large Numbers ◽  
Earthquake Source Parameters ◽  
Seismic Deformation

<p>Advances in GPU-based High-Performance Computing (HPC) facilities, combined with improvements in GPU-optimized shallow water models for tsunami inundation, allow us to perform large numbers of numerical simulations of earthquake-generated tsunamis on high-resolution numerical grids. Large numbers of simulations are necessary to investigate the multi-dimensional parameter space that defines the tsunami hazard, including situations where the tsunami is generated outside major tectonic structures, where fault geometry is uncertain and can take widely different orientations. With over 1500 numerical simulations, we perform suites of systematic parameter searches to investigate the sensitivity of inundation at the towns of Catania and Siracusa on Sicily to changes both in the earthquake source parameters and in the specification of the Manning friction coefficient. The inundation is modelled using the GPU-based Tsunami-HySEA code on a system of nested topo-bathymetric grids with a finest spatial resolution of 10 meters. We consider tsunamigenesis by large earthquakes with uniform slip where the location, focal depth, fault dimensions and slip, together with the angles of strike, dip, and rake, are defined by the standard Okada parameters. We consider sources both close to the shore, in which significant co-seismic deformation occurs, and offshore, where co-seismic deformation is negligible. For the offshore earthquake sources, we see systematic and intuitive changes in the inundation with changes in strike, dip, rake, and depth. For the near-shore sources, the dependency is far more complicated and co-seismic deformation becomes significant in determining the inundation. The sensitivity studies provide clear guidelines as to the necessary resolution for source discretization for Probabilistic Tsunami Hazard Analysis, with a need for a far finer discretization of local sources than for more distant sources. For a small number of earthquake sources, we study systematically the inundation as a function of the Manning Friction Coefficient. The sensitivity of the inundation to this parameter varies greatly for different earthquake sources and topo-bathymetry at the coastline of interest. An understanding of all these dependencies is needed to better understand the consequences of tsunamigenic earthquake models with more complex geometries, and in quantifying the epistemic uncertainty in the tsunami hazard.</p><p> </p><p>This work is partially funded by the European Union’s Horizon 2020 Research and Innovation Program under grant agreement No 823844 (ChEESE Center of Excellence, www.cheese-coe.eu). Computational resources made available through Sigma2/UNINETT on Saga at NTNU, Trondheim, Norway (in project nn5008k) and through PRACE on Marconi-100 at CINECA, Rome, Italy (through PRACE grant Pra21_5386/TsuHazAP).</p>

The plate contact geometry investigation based on earthquake source parameters at the Burma arc subduction zone

2013 ◽  
Vol 56 (5) ◽  
pp. 806-817 ◽  
Author(s):  
LangPing Zhang ◽  
ZhiGang Shao ◽  
HongSheng Ma ◽  
XingZhou Wang ◽  
ZhiHai Li
Keyword(s):  
Subduction Zone ◽  
Source Parameters ◽  
Contact Geometry ◽  
Earthquake Source ◽  
Earthquake Source Parameters

scholarly journals Earthquake source parameters that display the first digit phenomenon

2015 ◽  
Vol 22 (5) ◽  
pp. 625-632
Author(s):  
P. A. Toledo ◽  
S. R. Riquelme ◽  
J. A. Campos
Keyword(s):  
Seismic Moment ◽  
Waiting Times ◽  
Source Parameters ◽  
Tohoku Earthquake ◽  
Earthquake Source ◽  
Coseismic Slip ◽  
Self Organized ◽  
Earthquake Source Parameters ◽  
Self Organized Criticality

Abstract. We study the main parameters of earthquakes from the perspective of the first digit phenomenon: the nonuniform probability of the lower first digit different from 0 compared to the higher ones. We found that source parameters like coseismic slip distributions at the fault and coseismic inland displacements show first digit anomaly. We also found the tsunami runups measured after the earthquake to display the phenomenon. Other parameters found to obey first digit anomaly are related to the aftershocks: we show that seismic moment liberation and seismic waiting times also display an anomaly. We explain this finding by invoking a self-organized criticality framework. We demonstrate that critically organized automata show the first digit signature and we interpret this as a possible explanation of the behavior of the studied parameters of the Tohoku earthquake.

Earthquake Source Parameters: Rapid Estimates for Tsunami Forecasts and Warnings

2021 ◽  
pp. 299-333
Author(s):  
Barry Hirshorn ◽  
Stuart Weinstein ◽  
Dailin Wang ◽  
Kanoa Koyanagi ◽  
Nathan Becker ◽  
...  
Keyword(s):  
Source Parameters ◽  
Earthquake Source ◽  
Earthquake Source Parameters

scholarly journals Tsunami hazard warning and risk prediction based on inaccurate earthquake source parameters

2016 ◽  
Vol 16 (2) ◽  
pp. 577-593 ◽  
Author(s):  
Katsuichiro Goda ◽  
Kamilla Abilova
Keyword(s):  
Risk Assessment ◽  
Early Stage ◽  
Source Parameters ◽  
Earthquake Source ◽  
Tsunami Early Warning ◽  
Earthquake Source Parameters ◽  
Tsunami Risk ◽  
Tsunami Warnings ◽  
Hazard Warning

Abstract. This study investigates the issues related to underestimation of the earthquake source parameters in the context of tsunami early warning and tsunami risk assessment. The magnitude of a very large event may be underestimated significantly during the early stage of the disaster, resulting in the issuance of incorrect tsunami warnings. Tsunamigenic events in the Tohoku region of Japan, where the 2011 tsunami occurred, are focused on as a case study to illustrate the significance of the problems. The effects of biases in the estimated earthquake magnitude on tsunami loss are investigated using a rigorous probabilistic tsunami loss calculation tool that can be applied to a range of earthquake magnitudes by accounting for uncertainties of earthquake source parameters (e.g., geometry, mean slip, and spatial slip distribution). The quantitative tsunami loss results provide valuable insights regarding the importance of deriving accurate seismic information as well as the potential biases of the anticipated tsunami consequences. Finally, the usefulness of rigorous tsunami risk assessment is discussed in defining critical hazard scenarios based on the potential consequences due to tsunami disasters.

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