EESA06H3 Lecture Notes - Lecture 7: San Andreas Fault, 1964 Alaska Earthquake, Mount Wrangell
Document Summary
Free swimming organisms in the ocean they have segmented areas that contained air. Those are called saligrams that are in the himalayas. Ocean sediments that get caught between india and asia when it collided. => proof of remains of an ancient ocean in the himalayas. Ring of fire composed of: new zeeland japan (an island) alaska indonesia british columbia california chile, two oceanic plates colliding => the thicker denser one goes below the light plate. The thicker plate slab gets recycled/melts to produce earthquakes and then magma rises to produce volcanic island arcs. Japan located where 3 plates meet: eurasian, philippine. To develop a warning (20-25 sec) before an earthquake. Alaska: the stripes on the ocean floor produced by spreading. The whole plate is moving northward: volcanic arc: a lot of islands, and each island have 2-3 volcanoes, magmatic arc: volcanoes in continental crust.
