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Research | San Andreas MT

Deep San Andreas Fault Boundary Structure from Marine MT

EM Lab Personnel:

Brent Wheelock, Kerry Key, Steven Constable

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Offshore MT sites collect during Nov 2008-January 2009. Deep-towed CSEM data were also acquired along the entire offshore profile. Dots on land show the extensive MT data acquired by GFZ-Potsdam duing 2005-2008.

This research project aims to study the deep structure of the offshore section of the Pacific-North American plate boundary using controlled source EM and magnetotelluric soundings. It is an international collaboration between the Marine EM Laboratory at Scripps Institution of Oceanography, the magnetotelluric group at GFZ, Potzdam (Michael Becken, Oliver Ritter and Ute Weckmann) and the US Geological Survey (Paul Bedrosian). Our colleagues have been carrying out land MT measurements over the San Andreas Fault from 2005 to the present day, but ran up against an obstacle called the coastline. Modeling shows that important parts of the San Andreas Fault structure can only be fully imaged by extending the MT array offshore, and so we are going to do this in the latter half of 2008. The data will form the main part of Brent Wheelock's Ph.D. thesis. We are funding the project from a combination of UCSD/Scripps Institutional Shiptime and discretionaly funds associated with our industry activities.

Update: ( January 10, 2009):
The deployment cruise (November 2008) and recovery cruise (January 2009) have been a success. We deployed 38 sites across the continental shelf, slope and deep ocean and towed CSEM across the entire line. After two months' deployment, all 38 instruments were sucessfully recovered this week. Here's a video showing the action on deck during the recovery cruise (click on the video to access the larger version at youtube.com):

Click here to go to the GFZ project page

Click here to see our funded shiptime proposal, PDF (4.5 MB)

 

Last updated: Friday, 06-Aug-2010 15:54:32 PDT
email: sconstable@ucsd.edu