Investigation of Magmatic Systems Through Novel Seismic Receiver Function Analysis at Alaska-Aleutian Arc Volcanoes
Description:
The Alaska-Aleutian Arc exhibits along-arc variability in subduction parameters such as sediment input, subduction obliquity, and regional stress states. Thus, it provides an opportunity to investigate relationships between subduction parameters and crustal magma storage. In recent years, teleseismic receiver function (RFs) analysis has been increasingly applied at arc volcanoes to extract mid- to lower-crustal (>10 km) magmatic structure. Recent expansion of broadband instrumentation in the Alaska-Aleutian arc enables systematic application and further development of this technique to constrain variability in arc magma storage. Here, we focus on seven target volcanoes: Pavlof, Shishaldin, Westdahl, Akutan, Makushin, Okmok, and Cleveland. We extract back azimuthal patterns in receiver functions using both classical and novel methods, including harmonic decomposition and unsupervised machine learning, to assess the presence of complex, heterogenous crustal structure, and to assess its correlation to the volcanic edifice. Data at Akutan, Cleveland, and Okmok indicate significant local heterogeneity and a high correlation to the volcanic edifice, likely indicating local magmatic storage. Data at Westdahl and Pavlof indicate less heterogeneity and a low correlation to the volcanic edifice, possibly indicating more sensitivity to regional structure. Finally, data at Makushin and Shishaldin express a moderate correlation to the edifice, likely a result of a superposition of local magmatic and regional structures. This work contributes to the further development of a versatile RF workflow for quantiative comparison of observed crustal structure at arc volcanoes, supporting broader efforts to study arc volcanoes comparatively.
Session: Structure and Behavior of the Alaska-Aleutian Subduction Zone [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Ian
Student Presenter: Yes
Invited Presentation: Yes
Authors
Ian Wynn Presenting Author Corresponding Author iwynn@hawaii.edu University of Hawaii at Manoa |
Helen Janiszewski hajanisz@hawaii.edu University of Hawaii at Manoa |
John Power jpower@usgs.gov U.S. Geological Survey |
Matthew Haney mhaney@usgs.gov U.S. Geological Survey |
Diana Roman droman@carnegiescience.edu Carnegie Institute for Science |
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Investigation of Magmatic Systems Through Novel Seismic Receiver Function Analysis at Alaska-Aleutian Arc Volcanoes
Category
Structure and Behavior of the Alaska-Aleutian Subduction Zone