OCEAN 8 - tides each day Movement is circular rather than...

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Class 8 Tsunami & Tides Hurricane Wilma had the lowest pressure ever in the Atlantic Tsunami – not related to tides!- Caused by a displacement on the sea floor and can move 835 kilometers per hour, it gets slowed down by ocean floor once it reaches the shoreline down to 50 kilometers per hour Tsunami caused by earthquakes- Sometimes the water recedes December 2004 tsunami in Sumatra- 9.0 magnitude with 280,000 deaths Tsunami along the coast of Oregon-Washington and California Hazardous aspects of tsunami- Travel fast, hard to see in deep water, build large on shore, many waves, no warning if it is far away, affects huge area of coastline, very rare so people forget Tsunami from impacts- They can occur from impacts from meteors or landslides Tides = another dynamic process (actually a wave) that affects all oceans- Gravitational pull from the moon make high tide Pattern = Hi & Lo on opposite sides of an ocean basin, reverses every 6 hours, there are 2 high and 2 low
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Unformatted text preview: tides each day Movement is circular rather than east-west: When the sun and moon work together we get big spring tides, when they work against each other we get small neap tides. When tide is high on west coast it is low on the east coast ccwise in N hem, cwise in S hem Height of tide increases from center of ocean basin Main force = gravitational pull from the moon (creates bulge in earth) Smaller force = gravitational pull from the sun Earth-Moon-Sun system creates 28 day cycle: Biggest range = spring tides = full moon and new moon Smallest range = neap tides = half moon seen in the AM and PM ` Tide chart shows spring/neap tides, full/new/half moon phases, 2 Hi & 2 Lo tide Amphridromic points are points where there’s no tides because they revolve around these areas...
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