Potential Fields SIG: Magnetic anomalies over Shatsky Rise and the formation of ocean plateaus-Sept 21st

Sep 15th-Potential Fields SIG: Evaluating the Compatibility of Plate Kinematic Models with ...

Meeting Location:

HESS Club (Houston Engr. & Science Society)
5430 Westheimer
Houston, TX  77056

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Speaker: William W. Sager, Professor, Dept of Earth and Atmospheric Sciences, University of Houston

Shatsky Rise is an oceanic plateau, a volcanic mountain range in the northwest Pacific having an area equivalent to California.  It formed ~145-130 million years ago at the intersection of three oceanic spreading ridges.  Tamu Massif, the largest-known single volcano on Earth, is part of this plateau and begs the question of how such massive volcanoes form near spreading ridges.  Linear magnetic anomalies over the oceans show where spreading ridges were at times in the past.  They are the key to understanding Shatsky Rise formation because this feature contains many such anomalies. We recently collected magnetic anomaly data over Tamu Massif to improve the magnetic anomaly map, which was affected by artifacts caused by data collection over many decades.  Our research suggests that most of Shatsky Rise, including its huge volcanoes, formed at spreading ridges, recording magnetic anomalies in a manner similar to that of surrounding ocean crust. This observation contrasts with the view that Tamu Massif and other Shatsky Rise volcanoes formed from central eruptions of long lava flows.

Speaker Biography: William W. Sager, Professor, Dept of Earth and Atmospheric Sciences, University of Houston
Dr. Sager studied physics at Duke University, graduating with a BS degree in 1976, followed by earning the MS and PhD degrees in Geology and Geophysics at the University of Hawaii, in 1979 and 1983, respectively.  He spent 29 years teaching at Texas A&M University, before moving to the University of Houston in 2013.  He has sailed on 43 major geophysical cruises, 21 as chief-scientist, including 3 expeditions for the Ocean Drilling Program and Integrated Ocean Drilling Program.  He has published 127 papers in scientific journals and has advised approximately 100 graduate students, many of whom work in industry.

5:30  Registration / Cash Bar
6:15  Dinner Served
7:00  Presentation Begins
8:00  Adjourn

Price List:
 
Pre-Registered Late/Walk-Up
 Member
 $35  $45
 Non-Member  $40  $50
 Student Member
 $15  $25

When
9/21/2017 5:30 PM - 8:00 PM

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