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Instrument Request for Cascadia 2021 (202106)

Name: Cascadia 2021

Long Name: Complementing the 2020 Langseth offshore Cascadia survey with a large-N onshore nodal deployment


This deployment is an ambitious supplement to the Langseth offshore Cascadia survey scheduled for the summer of 2020. The focus of the onshore nodal deployment will be extending the ~20 2-D trench perpendicular offshore seismic lines ~50 km inland along the entire margin. Emerging work in subduction zones shows the controlled offshore source is well recorded on onshore receivers. Thus, we intend to leverage the scheduled Langseth survey to image the complete trench to wedge structure of multiple segments along the margin. A few, perhaps three or four 2-D lines will be extended further into the arc setting to investigate the along-strike variability observed in Cascadia using passive source techniques. Additionally, several smaller 3-D arrays will be attached to the 2-D lines that focus on locating tremor and investigating the fully 3-D geometry of the forearc. Instrument numbers available from the PIC supplemented with instruments from individual institutions are finally approaching the numbers where truly large-N style deployments are possible. The PIs included in this instrument request have extensive experience working in the area and with large nodal deployments. The timing of the offshore survey along with an increased availability of nodal instruments makes this deployment a potentially transformative data set in regard to our understanding of subduction related dynamics and hazards.

Scheduled Requests
# Request Id Leaves PIC Dock Returns to PIC Dock Updated
1 S5355-4485 2021-05-12 2021-07-20 2021-05-05 08:44:57
Type Instrument Quantity
Other Nodes (3 Channel) 600
Other Nodes (3 Channel) 100
Other Nodes (3 Channel) 200
Collaborators & Roles
PI Organization Role
Kevin Ward South Dakota School of Mines & Technology Principal Investigator (PI)
Anne Trehu Oregon State University Co-PI
Funded Funding Date Award # USAP / PFS Event # Support Letter Letter Due
Yes 2019-12-05 1946347 Yes 2019-01-16

Funding Agencies & Programs

Agency Program
National Science Foundation Geophysics
Using the PI's current contact information as the billing contact.
Experiment Support
If the experiment requires additional support, it will be listed below.
Passcal Staff? No
Computer Support? No
Field Coordination? Yes
SSF Coordination? No
International Shipping? No

Coordination Notes:

Langseth offshore Cascadia survey scheduled for the summer of 2020, most likely either June or August.

Location & Environment
Southwest Coordinates:
Latitude 40
Longitude -128
Northeast Coordinates:
Latitude 51
Longitude -120


Geographic Location:

Cascadia Subduction Zone