Array Data From the University of Memphis Seismo-Acoustic Coupling Experiment Fielded at the Eureka County Airport, Nevada
Description:
In collaboration with Sandia National Laboratory, the University of Memphis fielded a seismo-acoustic array experiment at the Eureka County airport to record the sonic boom from the capsule return of NASA's OSIRIS-REx mission to the asteroid Bennu. Eureka airport is nearly under the expected trajectory of the incoming capsule that landed in the western Utah desert early Sunday morning, September 24. The University of Memphis portion of experimental observations consists of fielding a 1 km aperture, 3x6 Golay array, composed of 18 three-component Magseis-Fairfield 5 Hz nodal seismometers, with two sub-arrays of the Golay array each containing an extra seismic node and a 4-element infrasound array. The infrasound instruments were built by VLF Designs expressly for use with a REFTEK 130 DAS. The Golay array is designed to characterize the slowness and azimuth of the descending Mach cone that are needed parameters in modeling the conversion from the acoustic wave into P and S waves in the Earth. The Golay array also makes it possible to analyze any secondary seismic waves that may be generated by the acoustic N-wave through frequency-slowness analysis. Small-scale (94m), P and S wave refraction and MASW surveys were performed near each acoustic array to determine near-surface structure to constrain models of the seismo-acoustic interaction. All seismic and acoustic array instrumentation recorded the audible, "double", sonic boom from capsule reentry. The incident acoustic wave impinged on the arrays with an apparent velocity of 2.9 km/s from an azimuth of N02oE. The infrasound observations show changes in the N-wave waveform over a distance scale of 1km with smaller secondary coda that may be related to near-surface seismic reverberations. The seismic data also show significant later arrivals in the first 1s that indicate conversions and reverberations within the lakebed sediments of Diamond Valley.
Session: The OSIRIS-REx Sample Return Capsule Re-entry: Geophysical Observations - I
Type: Oral
Date: 5/1/2024
Presentation Time: 04:45 PM (local time)
Presenting Author: Charles
Student Presenter: No
Invited Presentation:
Authors
Charles Langston Presenting Author Corresponding Author clangstn@memphis.edu University of Memphis |
Sonia Bazargan sbzargan@memphis.edu University of Memphis |
Stephen Horton shorton@memphis.edu University of Memphis |
Ipsita Mitra imitra@memphis.edu University of Memphis |
S M Ariful Islam sislam4@memphis.edu University of Memphis |
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Array Data From the University of Memphis Seismo-Acoustic Coupling Experiment Fielded at the Eureka County Airport, Nevada
Category
The OSIRIS-REx Sample Return Capsule Re-entry: Geophysical Observations