2019 Geophysical surveys and sediment coring in southern Cascadia (northern California)
Geophysical data and sediment cores collected offshore of northern California in 2019, a USGS-BOEM partnership
![An illustrative map of the seafloor off of California with ship tracklines and dots to show coring locations.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/BoHo_2019_website_map_0.png?itok=MW5AclBE)
These surveys are part of the USGS project, “Cascadia Subduction Zone Marine Geohazards.”
Objectives
The sediment sampling and geophysical surveys were designed to address questions regarding tectonic activity and sediment dispersal patterns across the margin. Survey tracks and sampling sites were targeted to investigate the Eel River forearc basin sedimentation history and the sources and pathways of sediment gravity flows, both of which provide context for interpreting the deep-sea turbidite record. In addition, these data will provide key information for understanding the earthquake history of active structures in southern Cascadia.
Participants
USGS Scientists: Jenna Hill (PI), Janet Watt, Danny Brothers, Nora Nieminski, Gerry Hatcher, Brandon Nasr, Pete Del Ferro, Jenny and UCSC Student: Travis Alonghi (Photo 7)
Partners
Bureau of Ocean and Energy Management (BOEM)
Platform Used
Data Collected
Jumbo piston/gravity sediment cores (Photos 1-5), Sparker multi-channel seismic (MCS), Chirp sub-bottom profiler (Photo 6)
Highlights
- >2,100 km of Chirp sub-bottom and sparker multi-channel seismic data collected
- ~40 sediment cores (3-7 m in length) recovered
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![A man and woman work on a steel core on the deck of a ship.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo2_boho_core_jenny_pete.png?itok=eBXF-Dgy)
![A smiling woman holds onto a sediment core.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo4_boho_nora_corelove.png?itok=unHpI8s7)
![A smiling woman holds a spring-loaded instrument against a sediment core.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo5_boho_shearvane_janet.png?itok=Xm7PRBgO)
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![Two men on the deck of a ship stand near a sonar device readying it for deployment.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo7_boho_chirp.jpg?itok=CkGuu7Ye)
Geophysical data and sediment cores collected offshore of northern California in 2019, a USGS-BOEM partnership
![An illustrative map of the seafloor off of California with ship tracklines and dots to show coring locations.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/BoHo_2019_website_map_0.png?itok=MW5AclBE)
These surveys are part of the USGS project, “Cascadia Subduction Zone Marine Geohazards.”
Objectives
The sediment sampling and geophysical surveys were designed to address questions regarding tectonic activity and sediment dispersal patterns across the margin. Survey tracks and sampling sites were targeted to investigate the Eel River forearc basin sedimentation history and the sources and pathways of sediment gravity flows, both of which provide context for interpreting the deep-sea turbidite record. In addition, these data will provide key information for understanding the earthquake history of active structures in southern Cascadia.
Participants
USGS Scientists: Jenna Hill (PI), Janet Watt, Danny Brothers, Nora Nieminski, Gerry Hatcher, Brandon Nasr, Pete Del Ferro, Jenny and UCSC Student: Travis Alonghi (Photo 7)
Partners
Bureau of Ocean and Energy Management (BOEM)
Platform Used
Data Collected
Jumbo piston/gravity sediment cores (Photos 1-5), Sparker multi-channel seismic (MCS), Chirp sub-bottom profiler (Photo 6)
Highlights
- >2,100 km of Chirp sub-bottom and sparker multi-channel seismic data collected
- ~40 sediment cores (3-7 m in length) recovered
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
![A man and woman work on a steel core on the deck of a ship.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo2_boho_core_jenny_pete.png?itok=eBXF-Dgy)
![A smiling woman holds onto a sediment core.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo4_boho_nora_corelove.png?itok=unHpI8s7)
![A smiling woman holds a spring-loaded instrument against a sediment core.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo5_boho_shearvane_janet.png?itok=Xm7PRBgO)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
![Two men on the deck of a ship stand near a sonar device readying it for deployment.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/half_width/public/thumbnails/image/Photo7_boho_chirp.jpg?itok=CkGuu7Ye)