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Subduction Segmentation Revealed by Full-Wave Ambient Noise Tomography of the Aacse Data

Description: 

The subduction of oceanic plates is a key component of plate tectonics theory. Previous studies have shown that subduction zones are segmented both along-strike and along-dip with the variations in seismic activity, magmatism, slip behavior, and subduction geometry. However, the processes leading to the segmentation of subduction zones remain poorly understood. Here, we focus on the western Alaska-Aleutian subduction zone within the footprint of the Alaska Amphibious Community Seismic Experiment (AACSE), where strong along-strike variations in slab dip, volcanism, plate fabrics, seismicity, and locking fraction have been observed. We use full-wave ambient noise tomography (FWANT) to construct a high-resolution 3-D shear wave velocity model of the subsurface to understand the along-strike structural segmentation. We combine the AACSE data with other available seismic data in the study area to maximize the data coverage. Preliminary data analyses have shown high-quality empirical Green’s functions between both onshore and offshore station pairs. We will present the preliminary tomography results and discuss the implications on subduction dynamics.

Session: Subduction Zone Structure From Trench to Arc [Poster]

Type: Poster

Date: 4/19/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Vincent Sassard

Student Presenter: Yes

Invited Presentation: 

Authors