Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder

Alaska Amphibious Community Seismic Experiment

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EOS article on AACSE

The Alaska Amphibious Community Seismic Experiment (AACSE) is an
offshore-onshore passive source seismic experiment designed to
investigate the processes that govern subduction, earthquakes,
and volcanism along the Alaska Peninsula.

In summer 2018 we deployed 75 Ocean Bottom Seismometers (OBSs) from OBSIP and 30 onshore broadband instruments from the PASSCAL Instrument Pool, shown on the map to the left. Thirty of the OBSs were provided by Woods Hole Oceanographic Instition and the remainder by Lamont Doherty Earth Observatory. OBS deployments took place on the R/V

The experiment is concurrent with the EarthScope USArray
Transportable Array (TA) and maximizes integrated use of TA
instruments, focusing on the eastern part of the subduction

The AACSE deployment includes a dense transect of seismometers crossing Kodiak and Katmai which integrates with TA stations 1000 km behind the arc. The Alaska Volcano Observatory (AVO) has enhanced several Katmai
and Alaska Peninsula stations to broadband in coordination with AACSE.

In May-June 2019, a nodal deployment of 400 nodal seismographs took place on Kodiak Island to provide dense imaging of the subducting slab, and in June 2019 an active source experiment on the R/V Marcus Langseth collected seismic reflection profiles south and west of Kodiak, as well as sending seismic sources signals into the AACSE OBS and land stations for enhanced imaging.

More information can be found on the AACSE web site and in our recent EOS article.