Seismo-acoustic measurements of an outdoor, field-scale, explosive "volcano"
Abstract
A recent NSF-sponsored, field-scale, outdoor test of controlled, sequential blasts at the University at Buffalo Geohazards Field Station provides the opportunity to correlate seismic and acoustic signals with explosion characteristics for a volcano analog. We deployed a linear array with geophones spanning 5-88 m and broadband 120-s seismometers from 30-330 m at 50-m spacing, each collocated with an infrasound sensor and microphones at two heights (ground and 4 m). On a 30-m semicircle, we placed microphones every 30 degrees, infrasound sensors every 90 degrees, and four broadband seismometers (three at the same position but with different burial depths). These data allow us to investigate the relationships between low-frequency seismic signals and acoustic signals (infrasound to 20 kHz) and examine air-to-ground and ground-to-air seismo-acoustic coupling. The densely sampled linear array provides validation of shock wave decay, and the semicircular array yields blast directivity. Each of these studies are correlated with the explosion source configuration (depth and strength of charges and the ignition sequence) and constrained by high-speed video, crater morphology, and particle-size analysis as provided by other workshop participants. This workshop constituted a significant field experience with hands-on training in rapid experiment deployment for both graduate and undergraduate students.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.V23F0128M
- Keywords:
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- 8414 Eruption mechanisms and flow emplacement;
- VOLCANOLOGYDE: 8425 Effusive volcanism;
- VOLCANOLOGYDE: 8429 Lava rheology and morphology;
- VOLCANOLOGYDE: 8445 Experimental volcanism;
- VOLCANOLOGY