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Session: Filling the Data Gap: Ocean-bottom Sensing with Fiber-optic Cables [Poster]

Type: Poster

Date: 10/9/2024

Time: 07:00 AM

Room: Stanley Park Ballroom

Ocean Networks Canada's NEPTUNE Cabled Seafloor Observatory offers an excellent opportunity to enhance ocean-bottom monitoring and Earthquake Early Warning (EEW) through fiber optic sensing, including Distributed Acoustic Sensing (DAS), Distributed Strain Sensing (DSS), and Distributed Temperature Sensing (DTS). The observatory consists of an 800 km cable loop off Vancouver Island, B.C., Canada. We will explore three strategies for integrating fiber optic sensing with NEPTUNE: (1) utilizing the existing cable loop, (2) deploying a dedicated sensing cable along the offshore subduction zone, and (3) laying a dedicated sensing cable from the Port Alberni shore station. The first strategy is limited by the shore station in Port Alberni being 70 km inland, reducing DAS effectiveness to the first repeater at approximately 100 km (30 km offshore). The second strategy involves a custom-designed cable for comprehensive sensing (including pressure, temperature, and DAS) positioned based on scientific needs. Despite high scientific potential, this approach is costly and relies on emerging technology. The third strategy could offer detailed tsunami warnings for Port Alberni, a region with a history of destructive tsunamis.

Our primary goal is to investigate the technical feasibility, costs, and funding opportunities for these options and to identify scientific use cases. Integrating fiber optic sensing with NEPTUNE would complement existing offshore seismometer networks, geodetic instruments, and oceanographic capabilities, and would enhance EEW for Canada’s west coast. It would also be strongly synergistic with parallel efforts to implement fiber optic sensing on the Ocean Observatories Initiative Regional Cabled Array offshore central Oregon.

We aim to facilitate discussions on feasibility, scientific benefits, and future directions, leading to well-informed and competitive funding proposals.

Presenting Author: Martin

Additional Authors

Martin Heesemann

Presenting Author Corresponding Author

mheesema@uvic.ca

Ocean Networks Canada, Victoria, , Canada

Jan Dettmer

jan.dettmer@ucalgary.ca

University of Calgary, Calgary, Alberta, Canada

Renate Hartog

jrhartog@uw.edu

University of Washington, Seattle, Washington, United States

Degnan Hembroff

degnanh@oceannetworks.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Jesse Hutchinson

hutchij@uvic.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Martin Karrenbach

martin.karrenbach@seismicsunusual.com

Seismics Unusual, Brea,, California, United States

Zoe Krauss

zkrauss@uw.edu

University of Washington, Seattle, Washington, United States

Bradley P Lipovsky

bpl7@uw.edu

University of Washington, Seattle, Washington, United States

Alireza Babaie Mahani

alirezab@uvic.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Steve Mihaly

smihaly@uvic.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Lanfranco Muzi

muzi@uvic.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Benoît Pirenne

bpirenne@oceannetworks.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Martin Scherwath

mscherwa@uvic.ca

Ocean Networks Canada, Victoria, British Columbia, Canada

Tianhaozhe Sun

thzsun@uvic.ca

Geological Survey of Canada, Vancouver, British Columbia, Canada

William S D Wilcock

wilcock@uw.edu

University of Washington, Seattle, Washington, United States

Miao Zhang

Miao.Zhang@dal.ca

Dalhousie University, Halifax, Nova Scotia, Canada

Jeremy Gosselin

jeremy.gosselin@nrcan-rncan.gc.ca

Natural Resources Canada, Sidney, British Columbia, Canada

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