Lecture 1 (August 28)

Lecture 1 (August 28) - Paradigm: All-encompassing idea...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Paradigm: All-encompassing idea that explains everything about some subject Gregor Mendel 1840s Austrian monk (genetics) Plate Tectonics o 1965: 90% of scientists believed that continents were fixed o 1970: 90% believed the opposite o Explains why volcanoes and oceans are where they are Earthquakes do not occur with equal frequency everywhere around the world (occur in a few narrow belts around the world) Earthquake occurrence is like 15% of the surface of the earth 90% of energy released in earthquakes occurs surrounding the Pacific Ocean (circumference Pacific belt) Narrow belt of earthquakes in middle of ocean basins Wider belts surrounding Pacific Rim Diffuse, messy cloud of earthquakes in central Asia Narrow mid-ocean belts of earthquakes correspond to linear undersea mountain ranges (e.g. Mid-Atlantic Ridge) Earthquakes tend to be shallow ( < 5 km) Occur very locally right on crusts of mid-ocean ridges Mariana Trench 10 km deep Wide zones of earthquakes around Pacific basin correspond to deep oceanic trenches
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/27/2009 for the course GEOL 240Lxg taught by Professor 12:30-01:50pm during the Fall '07 term at USC.

Page1 / 2

Lecture 1 (August 28) - Paradigm: All-encompassing idea...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online