Investigating Temporal Velocity Changes and Plate Interface Structure in the Southern Mw 9.2 1964 Great Alaska Earthquake Rupture Area: A Comparative Study of Ambient Noise and Earthquake Observations Using a Dense Node Array
Description:
We present latest findings beneath the Kodiak array employing seismic ambient noise and p-wave coda autocorrelations. Temporal variations observed in noise records offer the potential for high-precision monitoring of changes in elastic properties. These fluctuations, mainly influenced by long-period ocean waves, lead to clear shifts in observed seismic velocities. Our analysis indicates fractional variations in the order of 0.01%. We further demonstrate the influences of external phenomena such as tides, temperature, and precipitation on velocity changes.
Prior studies utilizing the Kodiak node array with receiver functions have successfully depicted a clear image of the subducting slab. Our research conducts a detailed comparative analysis between receiver functions, P-wave coda, and ambient noise autocorrelations. The autocorrelation methods reveal unique reflectors not previously observed in receiver functions, establishing it as a valuable complementary imaging technique.
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: Joshua
Student Presenter: Yes
Invited Presentation:
Authors
Joshua Osasona Presenting Author Corresponding Author josasona@unm.edu University of New Mexico |
Lindsay Worthington lworthington@unm.edu University of New Mexico |
Brandon Schmandt bschmandt@unm.edu University of New Mexico |
Grace Barcheck grace.barcheck@cornell.edu Cornell University |
Geoffrey Abers abers@cornell.edu Cornell University |
Evans Onyango eaonyango@alaska.edu University of Alaska Fairbanks |
Kiara Daly kad278@cornell.edu Cornell University |
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Investigating Temporal Velocity Changes and Plate Interface Structure in the Southern Mw 9.2 1964 Great Alaska Earthquake Rupture Area: A Comparative Study of Ambient Noise and Earthquake Observations Using a Dense Node Array
Category
Structure and Behavior of the Alaska-Aleutian Subduction Zone