Along-Strike Variations in Sub-Arc Melting Beneath the Alaska Peninsula
Description:
Volatiles are expelled from the slab in the subduction and facilitate partial melting in the overlying mantle wedge, leading to arc magmatism and volcanic hazard. Many active volcanoes in the Alaska Peninsula have diverse eruptive activities and eruptions are more intensive in the northeast than in the southwest. Diverse eruptive behaviors of these volcanoes may reflect variations in magma flux and sub-arc melting. Here we investigate the sub-arc melting by measuring seismic attenuation in the mantle wedge as attenuation is sensitive to fluids and temperature. The recently deployed seismic arrays in the Alaska Peninsula provide an unprecedented opportunity for high-resolution attenuation tomography. The preliminary result of path-average attenuation shows that attenuation is stronger in the northeast than in the southwest and the weakest attenuation is observed in the middle part. These changes in seismic attenuation are in agreement with a separate study of Vp/Vs, indicating the along-strike variations in sub-arc melting beneath the Alaska Peninsula.
Session: Subduction Zone Structure From Trench to Arc [Poster]
Type: Poster
Date: 4/19/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Zhuoran Zhang
Student Presenter: Yes
Invited Presentation:
Authors
Zhuoran Zhang
Presenting Author
Corresponding Author
zhuoran@msu.edu
Michigan State University
Songqiao Wei
swei@msu.edu
Michigan State University
Along-Strike Variations in Sub-Arc Melting Beneath the Alaska Peninsula