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Earth Science: Current research

Earth Science: Current research. Me: Dr. Ziegler (or Dr. Z). 0-18: Sioux Falls, SD 18-30: San Diego, CA. About me. About me. What do these things have in common?. Becoming a Scientist. 1. Be very curious (and creative) 2. Take Science and Math in High School

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Earth Science: Current research

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  1. Earth Science: Current research Me: Dr. Ziegler (or Dr. Z)

  2. 0-18: Sioux Falls, SD 18-30: San Diego, CA About me

  3. About me

  4. What do these things have in common?

  5. Becoming a Scientist 1. Be very curious (and creative) 2. Take Science and Math in High School 3. Go to college 4. Go to graduate school to get a phD Dr. Z:

  6. Graduate School:

  7. Working at OSU:

  8. Teach me: Plate Tectonics What questions have you asked? What have you learned?

  9. Scientists today ask: what IS driving plate tectonics • Convection • Slab Pull • Ridge Push 5000 degrees!! Short Story: heat trying to escape

  10. Scientists today ask: do plates sink all the way down? Warmer & less dense Colder & Denser Seismic Tomography

  11. 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?

  12. Next time I’ll bring magnets!

  13. Earth’s magnetic field Main field: Dipolar, 11o tilt Compass to geograph. north

  14. Earth’s magnetic field Caution: No actual bar magnet inside Earth Really: Fluid motion in liquid outer iron core makes the magnetic field through ‘dynamo action’ Result: a dynamic magnetic field Liquid!

  15. Two polarities, field occasionally ‘flips’ between them: Normal Polarity Reverse Polarity Reversals in Earth’s past:

  16. Field Excursions: *exact definition not agreed upon Are excursions and reversals related?

  17. Paleomagnetism: study of magnetization of old rocks Volcanic Rocks Sediments

  18. Working at OSU:

  19. Leah’s Research: Magnetic field strength changes a.k.a. - what is that crazy core doing this time?? Brunhes Jaramillo Matuyama Olduvai Strong Cobb Mountain Magnetic Strength Low at reversals Weak Today 2 Million years ago

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