UT Dallas Syllabus for ob6301.0g1.11f taught by Laurie Ziegler (ziegler)
Earth Science: Current research Me: Dr. Ziegler (or Dr. Z)
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Transcript of Earth Science: Current research Me: Dr. Ziegler (or Dr. Z)
![Page 1: Earth Science: Current research Me: Dr. Ziegler (or Dr. Z)](https://reader037.fdocuments.us/reader037/viewer/2022110103/5697bf841a28abf838c870ea/html5/thumbnails/1.jpg)
Earth Science: Current research
Me: Dr. Ziegler(or Dr. Z)
![Page 2: Earth Science: Current research Me: Dr. Ziegler (or Dr. Z)](https://reader037.fdocuments.us/reader037/viewer/2022110103/5697bf841a28abf838c870ea/html5/thumbnails/2.jpg)
About me
0-18: Sioux Falls, SD 18-30: San Diego, CA
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About me
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What do these things have in common?
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Becoming a Scientist1. Be very curious (and creative)2. Take Science and Math in High School3. Go to college 4. Go to graduate school to get a phD
Dr. Z:
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Graduate School:
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Working at OSU:
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Teach me: Plate Tectonics
What questions have you asked?What have you learned?
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Scientists today ask: what IS driving plate tectonics
•Convection•Slab Pull•Ridge Push
Short Story: heat trying to escape
5000 degrees!!
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Seismic Tomography
Colder & Denser
Warmer & less dense
Scientists today ask: do plates sink all the way down?
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What does Dr. Z ask?
Why and HOW does the magnetic field flip?How old is the inner core?What is going on where the mantle and the core meet?
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Next time I’ll bring magnets!
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Main field: Dipolar, 11o tiltCompass to geograph. north
Earth’s magnetic field
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Caution: No actual bar magnet inside Earth
Really: Fluid motion in liquid outer iron core makes the magnetic field through ‘dynamo action’
Liquid!
Result: a dynamic magnetic field
Earth’s magnetic field
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Two polarities, field occasionally ‘flips’ between them:
Normal Polarity
Reverse Polarity
Reversals in Earth’s past:
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Field Excursions: *exact definition not agreed
upon
Are excursions and reversals related?
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Paleomagnetism: study of
magnetization of old rocks
Volcanic RocksSediments
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Working at OSU:
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Leah’s Research: Magnetic field strength changes
Brunhes Matuyama OlduvaiJaramillo
Cobb Mountain
Mag
neti
c S
tren
gth
Today 2 Million years ago
Low at reversals
a.k.a. - what is that crazy core doing this time??
Strong
Weak