Step-by-Step... Getting Remote Infrasound Into Real-Time Estimate of Eruption Dynamics.
Abstract
In recent years , much effort ha s been focus ed on us ing remote sensing to characterise and identify explosive volcanic event s . It has range d from the use of space-based technology to the use of regional infrasound sensors. While we do not advocate for the use of only one technology, we concentrate on the potential advantage of including remote infrasound. Infrasound technology has been used in volcano monitoring for years now and has proven to be a valuable source of information to identify different type s of surface volcanic activity . From identification to localisation, th is technology allow s for a unique way to characterize the source. A key parameter that can be retrieve d is the exit gas velocity which can be further used in the modelling of the plume dynamic s and used to estimat e the potential height at which volcanic products could be transported . While recent work focused on calculating such parameter from local ly recorded infrasound signals , w e show that with certain assumption s , similar analysis c an be done with infrasound sensors located thousands of kilometres away. While it still remains a challe n ge to identify signals associated to large explosions at these distances, we show how film sound audio postproduction techniques , like spectral subtraction , can be used to i mprove detections. W e will also discuss the key controlling parameters involved in this type of filtering. Following this procedure, we demonstrate that from this enhanced detection and associated acoustic energy, we c an retrieve reasonable estimate s of plume height and signal duration at the source. In parallel, w e review the effect and contribution to the uncertainties of each different step that go es into th is computation . Each phases of the process could be automated and included into a real time framework. The current procedure has been benchmarked with current understanding and could be upgraded with new understanding and improvement s with in the field of infrasound and physical volcanology. This modular step-by-step approach allow s for immediate use of remote infrasound for eruption characterization , as well as the flexibility to reduc e uncertainties by improving individual blocks in the future. Retrieving source parameters , with high level of certainty , is key to better estimat ing and mitigat ing the associated hazard s .
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMV029...06T
- Keywords:
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- 4314 Mathematical and computer modeling;
- NATURAL HAZARDS;
- 4336 Economic impacts of disasters;
- NATURAL HAZARDS;
- 8485 Remote sensing of volcanoes;
- VOLCANOLOGY;
- 8488 Volcanic hazards and risks;
- VOLCANOLOGY