20 - EARTH AND PLANETARY SCIENCES 80 Professor Berry...

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EARTH AND PLANETARY SCIENCES 80 Professor Berry 4/7/10 Lecture 20 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS First of all, when you write the audit, remember to write a conclusion about sustainability. Remember each audit is your own idea. also remember to write a little paragraph about your observations. The Strawberry Creek Assignment is due on April 19 th . You have been doing this for 10 weeks, look at day length and how that influences plant growth…etc. ThIS whole class is about making connections. LECTURE Today, I want to talk about earthquakes. We live in earthquake country. In the greater bay area there are two organizations that think about earthquakes. One is the geological survey and the other is the seismic station on our campus, on the 2 nd floor of McCone hall. We are just as much in danger of getting an earthquake as Haiti, Chile and Indonesia. Despite the fact the US geological survey and the seismic station on our campus have been studying earthquakes, they can’t predict when they can occur, they can only tell you the likelihood and how big it is. The big ones are ranked 7-8 and little earthquakes are ranked at 3-4. We are sitting on the margin of one plate, called the North American plate. The plate is a series of rather stable rocks. The other side of where we are is the ocean, and that is on an entirely different plate. The rock that makes up the plates usually is made of basalt, which is denser than what makes up the North American plate. There is a tendency for earthquakes to happen because of our location. One thing to remember is that our wonderful San Andres fault moves laterally along the margin of the plate. The plate that starts north of us starts near Washington and British Columbia is the Jan de Fuca plate. The Juan de Fuca plate sits on top of the ocean plate, and fundamentally the North American plate tries to shove itself over the Juan de Fuca
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20 - EARTH AND PLANETARY SCIENCES 80 Professor Berry...

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