scholarly journals Large-scale numerical modeling of hydro-acoustic waves generated by tsunamigenic earthquakes

2014 ◽  
Vol 2 (7) ◽  
pp. 4629-4658 ◽  
Author(s):  
C. Cecioni ◽  
A. Abdolali ◽  
G. Bellotti ◽  
P. Sammarco
Keyword(s):  
Acoustic Waves ◽  
Large Scale ◽  
Sea Water ◽  
Early Warning Systems ◽  
Computationally Efficient ◽  
Significant Information ◽  
Tsunami Early Warning ◽  
Earthquake Scenarios ◽  
Sea Bed ◽  
Tsunami Early Warning Systems

Abstract. Tsunamigenic fast movements of the sea-bed generate pressure waves in weakly compressible sea water, namely hydro-acoustic waves, which travel at the sound celerity in water (about 1500 m s−1). These waves travel much faster than the counter part long free-surface gravity waves and contain significant information on the source. Measurement of hydro-acoustic waves can therefore anticipate the tsunami arrival and significantly improve the capability of tsunami early warning systems. In this paper a novel numerical model for reproduction of hydro-acoustic waves is applied to analyze the generation and propagation in real bathymetry of these pressure perturbations for two historical catastrophic earthquake scenarios in Mediterranean Sea. The model is based on the solution of a depth-integrated equation and therefore results computationally efficient in reconstructing the hydro-acoustic waves propagation scenarios.

scholarly journals Large-scale numerical modeling of hydro-acoustic waves generated by tsunamigenic earthquakes

2015 ◽  
Vol 15 (3) ◽  
pp. 627-636 ◽  
Author(s):  
C. Cecioni ◽  
A. Abdolali ◽  
G. Bellotti ◽  
P. Sammarco
Keyword(s):  
Acoustic Waves ◽  
Large Scale ◽  
Early Warning Systems ◽  
Computationally Efficient ◽  
Significant Information ◽  
Tsunami Early Warning ◽  
Earthquake Scenarios ◽  
Weakly Compressible ◽  
Tsunami Early Warning Systems ◽  
Pressure Perturbations

Abstract. Tsunamigenic fast movements of the seabed generate pressure waves in weakly compressible seawater, namely hydro-acoustic waves, which travel at the sound celerity in water (about 1500 m s−1). These waves travel much faster than the counterpart long free-surface gravity waves and contain significant information on the source. Measurement of hydro-acoustic waves can therefore anticipate the tsunami arrival and significantly improve the capability of tsunami early warning systems. In this paper a novel numerical model for reproduction of hydro-acoustic waves is applied to analyze the generation and propagation in real bathymetry of these pressure perturbations for two historical catastrophic earthquake scenarios in Mediterranean Sea. The model is based on the solution of a depth-integrated equation, and therefore results are computationally efficient in reconstructing the hydro-acoustic waves propagation scenarios.

scholarly journals Feasibility of Tsunami Early Warning Systems for small volcanic islands

2009 ◽  
Vol 9 (6) ◽  
pp. 1911-1919 ◽  
Author(s):  
G. Bellotti ◽  
M. Di Risio ◽  
P. De Girolamo
Keyword(s):  
Physical Model ◽  
Early Warning ◽  
Model Experiment ◽  
Large Scale ◽  
Early Warning Systems ◽  
Warning Systems ◽  
Tsunami Early Warning ◽  
Volcanic Islands ◽  
Tsunami Early Warning Systems ◽  
The Waves

Abstract. This paper investigates the feasibility of Tsunami Early Warning Systems for small volcanic islands focusing on warning of waves generated by landslides at the coast of the island itself. The critical concern is if there is enough time to spread the alarm once the system has recognized that a tsunami has been generated. We use the results of a large scale physical model experiment in order to estimate the time that tsunamis take to travel around the island inundating the coast. We discuss how and where it is convenient to place instruments for the measurement of the waves.

Depth-integrated equation for large-scale modelling of low-frequency hydroacoustic waves

2013 ◽  
Vol 722 ◽  
Author(s):  
P. Sammarco ◽  
C. Cecioni ◽  
G. Bellotti ◽  
A. Abdolali
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Low Frequency ◽  
Early Warning Systems ◽  
Solid Base ◽  
Warning Systems ◽  
Tsunami Early Warning ◽  
Scale Modelling ◽  
Three Dimensional Models ◽  
Tsunami Early Warning Systems

AbstractWe present a depth-integrated equation for the mechanics of propagation of low-frequency hydroacoustic waves due to a sudden bottom displacement associated with earthquakes. The model equation can be used for numerical prediction in large-scale domains, overcoming the computational difficulties of three-dimensional models and so creating a solid base for tsunami early warning systems.

Blue Economy of India and Technology Initiatives II

2018 ◽  
Vol 52 (5) ◽  
pp. 19-26
Author(s):  
Malayath Aravindakshan Atmanand ◽  
Ramasamy Venkatesan ◽  
Mallavarapu Venkata Ramanamurthy ◽  
Gidugu Ananda Ramadass ◽  
Ramalingam Kirubagaran ◽  
...  
Keyword(s):  
Deep Ocean ◽  
Early Warning Systems ◽  
Social Needs ◽  
Coastal Protection ◽  
Economic Policies ◽  
Tsunami Early Warning ◽  
Ocean Environment ◽  
Technology Initiatives ◽  
Tsunami Early Warning Systems ◽  
Gas Leaks

AbstractWith land-based resources depleting fast, sustained harvesting of ocean resources with an appropriate trade-off between economic growth, social needs, and the health of the ocean environment is essential. India, with an over 7600-km-long coastline, an exclusive economic zone of 2.3 million km2, and seeking extension for additional 560 km, has initiated blue economic policies for leveraging the growth of the national economy. The first part of the paper presented in the OCEANS '18 conference in Kobe discussed the technology initiatives to harness the vast living and nonliving blue economic resources in India, including deep-ocean minerals, hydrocarbons, renewable energy, ocean desalination, and bioprospecting. This paper describes the activities carried out related to the activities undertaken by the National Institute of Ocean Technology (NIOT) in the areas of coastal protection, cyclone and tsunami early warning systems, coral habitat observations, sustainable fishing, and numerical studies carried out to understand the influence of natural gas leaks on deep-ocean ecology.

Depth-integrated equation for hydro-acoustic waves with bottom damping

2015 ◽  
Vol 766 ◽  
Author(s):  
Ali Abdolali ◽  
James T. Kirby ◽  
Giorgio Bellotti
Keyword(s):  
Acoustic Waves ◽  
Large Scale ◽  
Model Equation ◽  
Low Frequency ◽  
3D Models ◽  
Sediment Layer ◽  
Sea Bed ◽  
Weakly Compressible ◽  
Acoustic Wave Generation

AbstractWe present a depth-integrated equation for the mechanics of generation, propagation and dissipation of low-frequency hydro-acoustic waves due to sudden bottom displacement in a weakly compressible ocean overlying a weakly compressible viscous sediment layer. The model is validated against a full 3D computational model. Physical properties of these waves are studied and compared with those for waves over a rigid sea bed, revealing changes in the frequency spectrum and modal peaks. The resulting model equation can be used for numerical prediction in large-scale domains, overcoming the computational difficulties of 3D models while taking into account the role of bottom dissipation on hydro-acoustic wave generation and propagation.

scholarly journals Real-time inversion of tsunamis generated by landslides

2011 ◽  
Vol 11 (9) ◽  
pp. 2511-2520 ◽  
Author(s):  
C. Cecioni ◽  
A. Romano ◽  
G. Bellotti ◽  
M. Risio ◽  
P. de Girolamo
Keyword(s):  
Real Time ◽  
Laboratory Experiments ◽  
Early Warning Systems ◽  
Time Inversion ◽  
Warning Systems ◽  
Optimal Position ◽  
Tsunami Early Warning ◽  
Tsunami Waves ◽  
Inversion Procedure ◽  
Tsunami Early Warning Systems

Abstract. In this paper, we test a method for forecasting in real-time the properties of offshore propagating tsunami waves generated by landslides, with the aim of supporting tsunami early warning systems. The method uses an inversion procedure, that takes input data measurements of water surface elevation at a point close to the tsunamigenic source. The measurements are used to correct the results of pre-computed numerical simulations, reproducing the wave field induced by different landslide scenarios. The accuracy of the method is evaluated using the results of laboratory experiments, aimed at studying tsunamis generated by landslides sliding along the flank of a circular shoreline island. The paper investigates what the optimal position is of where to measure the tsunamis, what the effects are, the accuracy of the results, and of uncertainties on the landslide scenarios. Finally, the method is successfully tested using partial input time series, simulating the behaviour of the system in real-time during the tsunami event when forecasts are updated, as the measurements become available.

Sign in / Sign up

Export Citation Format

Share Document