The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system
Thesis (Ph. D. in Geophysics)--Joint Program in Marine Geology and Geophysics (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2013.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2013
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| Online Access: | http://hdl.handle.net/1721.1/79289 |
| _version_ | 1811072817131683840 |
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| author | McGary, R. Shane |
| author2 | Rob L. Evans. |
| author_facet | Rob L. Evans. McGary, R. Shane |
| author_sort | McGary, R. Shane |
| collection | MIT |
| description | Thesis (Ph. D. in Geophysics)--Joint Program in Marine Geology and Geophysics (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2013. |
| first_indexed | 2024-09-23T09:15:08Z |
| format | Thesis |
| id | mit-1721.1/79289 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T09:15:08Z |
| publishDate | 2013 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/792892022-01-14T18:55:25Z The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system Joint seismic and MT investigation of the Cascadia subduction system McGary, R. Shane Rob L. Evans. Woods Hole Oceanographic Institution. Joint Program in Marine Geology and Geophysics Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Joint Program in Marine Geology and Geophysics. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Thesis (Ph. D. in Geophysics)--Joint Program in Marine Geology and Geophysics (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2013. Page 176 blank. Cataloged from PDF version of thesis. Includes bibliographical references. In this thesis we present results from inversion of data using dense arrays of collocated seismic and magnetotelluric stations located in the Cascadia subduction zone region of central Washington. In the migrated seismic section, we clearly image the top of the slab and oceanic Moho, as well as a velocity increase corresponding to the eclogitization of the hydrated upper crust. A deeper velocity increase is interpreted as the eclogitization of metastable gabbros, assisted by fluids released from the dehydration of upper mantle chlorite. A low velocity feature interpreted as a fluid/melt phase is present above this transition. The serpentinized wedge and continental Moho are also imaged. The magnetotelluric image further constrains the fluid/melt features, showing a rising conductive feature that forms a column up to a conductor indicative of a magma chamber feeding Mt. Rainier. This feature also explains the disruption of the continental Moho found in the migrated image. Exploration of the assumption of smoothness implicit in the standard MT inversion provides tools that enable us to generate a more accurate MT model. This final MT model clearly demonstrates the link between slab derived fluids/melting and the Mt. Rainier magma chamber. by R. Shane McGary. Ph.D.in Geophysics 2013-06-17T19:53:29Z 2013-06-17T19:53:29Z 2013 2013 Thesis http://hdl.handle.net/1721.1/79289 846912191 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 176 p. application/pdf n-us-wa Massachusetts Institute of Technology |
| spellingShingle | Joint Program in Marine Geology and Geophysics. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. McGary, R. Shane The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title | The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title_full | The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title_fullStr | The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title_full_unstemmed | The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title_short | The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system |
| title_sort | cafe experiment a joint seismic and mt investigation of the cascadia subduction system |
| topic | Joint Program in Marine Geology and Geophysics. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. |
| url | http://hdl.handle.net/1721.1/79289 |
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