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Waves_4 - EOSC 114 Guillaume Carazzo Earthquakes Volcanoes...

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1 EOSC 114 / Guillaume Carazzo Earthquakes Volcanoes Landslides Storms Waves Impacts Recap Last session we examined: - Rogue waves - Seiche
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2 Waves Lecture 1 - How do waves work ? Lecture 2 - Waves on shorelines Lecture 3 - Resonance & Interference Lecture 4 - Monster waves Lecture 5 - The future… Outline 1/ Tsunami 2/ Storm surge
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3 Learning Goals By the end of this class you should be able to: 1. Discuss why tsunami come ashore so violently 2. Describe how tsunami form 3. Identify tsunami warning signs, and know how to respond 4. Describe the processes responsible for a storm surge 5. Identify the maximum surge will occur in a hurricane 1/Tsunami
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4 Tsunami Japanese for ‘harbor wave’ tsu = harbor nami = wave Rapid displacement of large amounts of ocean water Caused by: 1. Earthquakes (vertical submarine fault motion)* 2. Volcanic eruptions 3. Meteor impacts (BIGGEST) 4. Landslides 5. Icebergs falling from glaciers (smallest) *sometimes called “seismic sea waves” In the open ocean, typical tsunami features: Wavelength (L) ~200-400 km Wave speed (c) ~200 m/s (720 km/hr) Wave height (H) ~0.5 - 1 m (small!) Period (T) ~10 min - 1 hour Steepness <<<1 (tiny!) Tsunami characteristics Note: average ocean depth is ~4 km
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5 What happens when a tsunami comes ashore?
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