SCRIPPS INSTITUTION OF OCEANOGRAPHY FACULTY CANDIDATE SEMINAR -
DATE: March 4th, Wednesday, 2:15 p.m.
LOCATION: Eckart 227
SPEAKER: Nathaniel Lindsey
Distributed Acoustic Sensing (DAS) is an emerging fiber-optic geophysical method that transforms an optical fiber commonly used for modern telecommunications into a massive geophysical array. Although the details of the DAS measurement principle and instrument response characteristics are still an open subject of research, the potential capability to access broadband (0.001 – 1000 Hz) strain wavefields at the meterscale over tens of linear kilometers wherever fiber is available has wide appeal across the geosciences. In this seminar, I will use DAS data recently collected during a brief, 4-day experiment offshore Monterey Bay, CA to argue that DAS is an important new technology for seafloor science. I will show examples of local earthquake wavefields (0.5 – 20 Hz), primary and secondary microseisms (0.05 – 0.5 Hz), tidal bores (f~1-5 Hz), storm-induced sediment transport (f~0.8-10 Hz), infragravity waves (f=0.01-0.05 Hz), and breaking internal waves (f~0.001 Hz). I will conclude by highlighting where, why and how DAS adds value onshore and offshore, and illustrate potential research directions using this and other emerging fiber-optic methods.