Alaska Amphibious Community Seismic Experiment: Update and Outlook

Date: 4/26/2019

Time: 04:30 PM

Room: Cascade II

The Alaska Amphibious Community Seismic Experiment (AACSE) represents one of the first shoreline-crossing seismic arrays of its kind focused on a subduction zone with prolific earthquakes and a complex volcanic arc. The 105 seismic instruments (75 OBS and 30 land broadband seismometers) associated with the AACSE are currently deployed along the Alaska Peninsula for a period of approximately 15 months, beginning in Spring 2018. This comprises an array that extends from the source region of the January 2018 M 7.9 earthquake east of Kodiak Island, west through the Shumagin Islands, and from the backarc to more than 200 km outboard of the trench. The AACSE array is complemented by EarthScope TA, Alaska network, and AVO stations on land. This effort represents an unprecedented deployment of seismic sensors over the seismogenic zone, sampling a region that that spans a hypothesized change in interseismic coupling along the subduction plate boundary, as well as a systematic change in chemical compositions of arc volcanoes. Better understanding structure and seismic behavior across these kinds of transitional boundaries helped to motivate this community effort, and should be made possible by analysis efforts currently being planned across the seismic community using this open-access data. Here we will provide an overview of the current state of the AACSE following the land and ocean-bottom instrument deployments, and servicing of land stations. We will summarize instrument performance across the land portion of the array, including noise levels and data return-rates, and also provide some initial assessments of recorded seismicity rates. Many complementary and add-on experiments have been coordinated in the final year of the experiment, and we will also provide an update on those opportunities and forthcoming datasets.

Presenting Author: Emily Roland

Authors