tsunami theory - isnet theory.pdf · most tsunamis do not result in giant breaking waves. rather,...
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![Page 1: Tsunami Theory - ISNET Theory.pdf · Most tsunamis do not result in giant breaking waves. Rather, they come in much like very high and fast tides. Much of the damage inflicted by](https://reader033.vdocuments.net/reader033/viewer/2022053011/5f0e86847e708231d43faa21/html5/thumbnails/1.jpg)
ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Tsunami Theory
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Tsunami Casualties
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Tsunamigenic Sources
(after Gusiakov)
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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About 500 m run-up
Landslide: Lituya Bay, Alaska 1958
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Dengler & Preuss (2003)
Google Earth
A tsunami following an earthquake devastated several villages.Run-up up to 15 meters. More than 2100 casualties.
Papua New Guinea Tsunami 17.7.1998
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Okal & Synolakis (2004)
Run-up distribution of Papua New Guinea 1998 and Nicaragua earthquake Tsunami 1992 (MW=7.7)
Earthquake
Landslide
Run-up distribution
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Gisler et al. (2003) Two and Three Dimensional Simulations of Asteroid Ocean Impacts
1200 processors for several weeks. Up to 200,000,000 computational cells were used, and the total computational time was 1,300,000 cpu-hours
Asteroid impact tsunami
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Gisler et al. (2003)
Asteroid impact
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Initial tsunami height > 1 km ! Gisler et al. (2003)
Asteroid impact
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Earthquake distribution
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Plate motions imaged by GPS
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Plate tectonics
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Continental drift
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Mantle convection
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Driving forces
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USGS
Elements of plate tectonics
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McCaffrey (2009)
Subduction Factory
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Subduction earthquake tsunami source
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Subduction earthquake tsunami source
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Subduction earthquake tsunami source
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Tectonic setting SumatraTsunami Generation
Coupling at the subduction interfaceTectonic loading
Sudden releaseTransfer of potential energy
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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V=√g⋅d λ=λ0√ hh0
Tsunami velocity and wave length
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Gjevik (2004)
Tsunami properties
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Gjevik (2004)
Tsunami properties table
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Most tsunamis do not result in giant breaking waves. Rather, they come in much like very high and fast tides. Much of the damage inflicted by tsunamis is caused by strong currents and floating debris.
NOAA
Artistic image of the tsunami
Inundation characteristic
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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TsunamiModelling
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Modelling steps
● Tsunami generation: Initial condition● Tsunami propagation (nonlinear shallow water)● Tsunami run-up and coastal inundation (high resolution, Boussinesq equations)
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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Tsunami is a long wave
Long-waveVx ≠ f(z)
Short-waveVx = f(z)
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● Finite differences on structred grids● Pro: easy to implement, robust, simple grids,
straightforward parallelization of computation● Contra: constant resolution, need for nested grids
in coastal regions● Examples: TUNAMI-family, MOST, FUNWAVE
● Finite elements on unstructured grids● Pro: single computational domain for deep-ocean
propagation and inundation● Contra: time consuming, stability problems, hard
to program, complex grids● Examples: TsunAwi, ANUGA, Uni Bologne
Numerical schemes
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Finite differences on structured grid
Imamura (1996)
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Harig et al. (2008)
Nested grids
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Harig et al. (2008)
GITEWS Indonesian grid:> 4 Mio elements with
resolution down to 50 m
Unstructured grid
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General rule also applies here:Last 10% of model accuracy costs 90% of efforts.
While increasing numerical grid resolution do not forget about physical resolution of bathymetry used.
Source uncertainty is always there...
Limits of modelling
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Sumatra 2004
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Tsunami Animation
tsunami_large_2d
sumatra_3d
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ISNET/ISA Workshop Tehran12.09.2013 Andreas Hoechner
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SourceModelling
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Initial condition
● Tsunami generation: Initial condition
● Tsunami propagation (nonlinear shallow water)
● Tsunami run-up and coastal inundation (high resolution, Boussinesq equations)
● How do we get an appropriate initial condition?
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Seismology: Source parameters
GEOFON: Epicenter, Magnitude
Teleseismics:Rupture Timing (D. Roessler)Teleseismics:
Source Extent
Magnitude saturation? Slip Distribution?
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Magnitude Saturation, Kanamori 1983
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Fault Extension
Magnitude is a logarithmic function of moment
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Source is not a point source
● mb=7.2
● MS=8.2
● MW=9.3
Hoechner et al. 2008
Uplift [m]Slip [m]
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Source determination
● Present status: ● Use Epicenter and Magnitude to extract scenarios from
database● Check with buoys, tide gauges, GPS, if available
● Problems and Requirements:● Time-critical: Tsunami can reach coast within 20 minutes● Magnitude might be underestimated for large events (was
8.0 for Sumatra instead 9.3)● Seismological methods measure acustic luminosity, rather
than total energy release ● Epicenter is just nucleation point, Centroid not so easy to
determine● Slip distribution necessary for large events or complex
bathymetry
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Warning center: Data flow
Seismik BojePegel Bodendrucksensor EB DatenGPS
-Lokale Behörden-Gefährdete Bevölkerung
Sensor-Systeme
Messungen
Lagebeurteilung und Entscheidungsunterstützung
-Weitere nationale und internationale Empfänger
Simulation
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Warning center: Decision Support System