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Thousands of Explosion-Triggered Seismo-Acoustic Waveforms Over Oklahoma for Studying Multi-Scale Atmospheric Variability

Session: Infrasound and the Seismo-Acoustic Wavefield I

Type: Oral

Date: 4/20/2021

Presentation Time: 10:45 AM Pacific

Description: 

We assemble nine-months of seismic data that record routine munition disposal operations conducted by the McAlester Army Ammunition Plant (McAAP) in Oklahoma state. The seismic stations that provide these data distribute over four neighboring US states and record sequences of repetitive, quasi-similar signals almost daily. These signals record small (100s of kg) to moderate (several ton) yield sources in the 5-15Hz band as wavetrains of short duration pulses (~1-3s widths) that separate by 20s intervals, and move near acoustic propagation speeds over regions instrumented by ~150 seismic sensors. Data collected from as far as 670km from source often recorded 52 such pulses per day, and over durations of 1200s. We apply noise-adaptive, constant-false alarm rate power detectors against these data to construct detection maps that reveal multi-scale spatial and temporal atmospheric variability. We compare these data with infraGA modeling output to show that range-dependent raypath focusing and mechanical coupling significantly controls spatial detection variability. Our detection maps further reveal that concurrent, tropospheric and seasonally dependent stratospheric winds most reliably predict temporal detection variability. To conclude, we deliver our blasting records, seismic waveforms, videos, and processed data products as a comprehensive, ground-truth dataset to facilitate future atmospheric and seismo-acoustic studies.

Presenting Author: Joshua D. Carmichael

Student Presenter: No

Authors