2018 Regional geophysical surveys of southern Cascadia (offshore northern California and southern Oregon)
Regional geophysical surveys conducted offshore of northern California and southern Oregon in 2018, a USGS-Humboldt State University partnership
These surveys are part of the USGS project, “Cascadia Subduction Zone Marine Geohazards.”
![Illustration of the seafloor off the coast with areas highlighted to show detail.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/CoralSea_2019_website_map.png?itok=kYRi_czy)
Objectives
Characterize offshore geohazards and source-to-sink sedimentary dynamics offshore southern Cascadia.
Participants
USGS Scientists Janet Watt and Jenna Hill (PIs), Daniel Brothers, Jared Kluesner, Rachel Marcuson, Chuck Worley (Photo 3)
Partner
Humboldt State University (Photo 1)
Platform Used
Humboldt State University’s R/V Coral Sea (Photo 5)
Data Collected
Sparker multi-channel seismic (MCS), Chirp sub-bottom, magnetometer (Photos 2 and 4)
Highlights
- Active faulting and folding along numerous cross-shore structures on the shelf; including the Table Bluff anticline, Little Salmon, Mad River, and Bald Mountain-Big Lagoon faults
- First high-resolution sparker imagery of faulting at the deformation front (~3,500 m water depth)
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![A small group gathers around a woman who's extracting a sediment core from a marshy area while a man talks.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/hsu_patton_melanie.jpg?itok=ekyIQCPx)
![Geophysical equipment sits on the deck of a boat.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_chirp_maggie.jpg?itok=JchJtvDj)
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![A group of 6 people wearing lifejackets stand on a ship smiling up at the camera person.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_group.jpg?itok=cbnBUA-2)
![Four people on the stern of a boat wear life jackets and prepare a long cable.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_mcs.jpg?itok=G15O-mmq)
![Photo of a research boat anchored on the water.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coral-sea-image.jpg?itok=69eF4mFW)
Regional geophysical surveys conducted offshore of northern California and southern Oregon in 2018, a USGS-Humboldt State University partnership
These surveys are part of the USGS project, “Cascadia Subduction Zone Marine Geohazards.”
![Illustration of the seafloor off the coast with areas highlighted to show detail.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/CoralSea_2019_website_map.png?itok=kYRi_czy)
Objectives
Characterize offshore geohazards and source-to-sink sedimentary dynamics offshore southern Cascadia.
Participants
USGS Scientists Janet Watt and Jenna Hill (PIs), Daniel Brothers, Jared Kluesner, Rachel Marcuson, Chuck Worley (Photo 3)
Partner
Humboldt State University (Photo 1)
Platform Used
Humboldt State University’s R/V Coral Sea (Photo 5)
Data Collected
Sparker multi-channel seismic (MCS), Chirp sub-bottom, magnetometer (Photos 2 and 4)
Highlights
- Active faulting and folding along numerous cross-shore structures on the shelf; including the Table Bluff anticline, Little Salmon, Mad River, and Bald Mountain-Big Lagoon faults
- First high-resolution sparker imagery of faulting at the deformation front (~3,500 m water depth)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
![A small group gathers around a woman who's extracting a sediment core from a marshy area while a man talks.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/hsu_patton_melanie.jpg?itok=ekyIQCPx)
![Geophysical equipment sits on the deck of a boat.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_chirp_maggie.jpg?itok=JchJtvDj)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
![A group of 6 people wearing lifejackets stand on a ship smiling up at the camera person.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_group.jpg?itok=cbnBUA-2)
![Four people on the stern of a boat wear life jackets and prepare a long cable.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coralsea_mcs.jpg?itok=G15O-mmq)
![Photo of a research boat anchored on the water.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/coral-sea-image.jpg?itok=69eF4mFW)