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Resolving Complex Infrasound Wavefields Using a Dense Array

Session: Infrasound and the Seismo-Acoustic Wavefield [Poster]

Type: Poster

Date: 4/20/2021

Presentation Time: 04:15 PM Pacific

Description: 

Secondary infrasound from earthquakes may contain useful information on ground shaking, but the presence of many interfering waves from different radiators complicates source analyses. We address this problem using a dense array of approximately 20 sensors. Using both direct infrasound waves from a local earthquake approximately under the array (M3.5, 10 km depth, aftershock of central Idaho earthquake) and refracted infrasound waves from a regional event (M6.5, 720 km distance, Tonopah NV), we show that both the slowness resolution and ability to detect correlated signal improve dramatically by increasing the number of sensors in the array. As an additional benefit, redundancy of array elements makes the array's functionality less vulnerable to individual sensor dropout or loss.

Many routine applications of infrasound face the challenge of distinguishing wave sources of interest from superposed waves from many sources, and single-channel rapid-deploy instrumentation suitable for "large-N" recording is increasingly available (e.g., the Gem infrasound logger used in this work). Consequently, we expect our findings about dense array capabilities to be broadly applicable beyond our specific problem of earthquake infrasound.

Presenting Author: Jacob F. Anderson

Student Presenter: No

Authors