EXPLORING FOREARC DEFORMATION OFFSHORE KODIAK ISLAND USING AMPHIBIOUS SEISMIC OBSERVATIONS (Invited Presentation)
Here, we take a closer look at the morphology and earthquake behavior of the offshore portion of the Kodiak segment of the Alaska forearc. Seismic observations collected as a part of the Alaska Amphibious Seismic Experiment (AACSE), as well as new seismic reflection data, and multibeam bathymetry can provide a more detailed picture of how the forearc is deforming. The forearc offshore Kodiak Island represents a region of uniquely high seismicity rates. Mapped faults along the continental shelf and slope, including the Albatross Bank fault and Kodiak Shelf fault zone, may accommodate ongoing deformation and lead to elevated seismicity, however, the downgoing plate is also capable of generating significant earthquakes, as demonstrated by the 2018 Gulf of Alaska, and 2019 Anchorage earthquakes. In this region of the forearc, it has been difficult to associated small events with a particular fault source, or distinguish whether they occur in the forearc, downgoing plate, or along the plate interface. By integrating earthquake source properties with new structural interpretations, we aim to refine models of deformation and seismic hazards along the margin.