A 400-node linear array crossing the Denali fault and Alaska subduction zone

In the winter of 2019, a field team of 10 snowshoed to deploy 400 3-component autonomous nodes in south-central Alaska. At 1 km spacing, 300 were deployed in a semi-linear array along the Parks Highway between Trapper Creek and Nenana. The remaining 100 were densely deployed across the Denali Fault with variable station spacing expanding from the inferred fault trace (3 m to 30 m). The nodes recorded continuous data contemporaneously for ~30 days at 500 samples per second. Preliminary results from this data set include:

1) Seismic record sections of crustal, intraslab, and teleseismic earthquakes

2) Observations of trapped waves within the Denali fault zone

3) Ambient noise tomography along the two linear arrays

4) Converted wave images of the subducted slab (RFs)

5) Focal mechanisms of local earthquakes

6) Shear-wave splitting from intraslab earthquake

The overarching goals of this deployment are to document structural variations at all scales and depths, including the upper mantle, the Moho and crust, and the Denali fault zone. We also hope to demonstrate the capabilities and limitations of nodal stations in this region of Alaska, and to suggest modifications for future deployments. The waveforms and metadata were prepared by PASSCAL and archived at the IRIS Data Management Center (network code ZE).