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| Titel |
On the use of an infrasonic array at Singapore for volcanoes monitoring |
| VerfasserIn |
Benoit Taisne, Patrick Whelley, Alexis Le Pichon, Chris Newhall |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077774
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| Zusammenfassung |
| Violent volcanic eruptions are common in the Southeast Asia. Southeast Asia, bordered by
active subduction zones with hundreds of active volcanoes. The physical condition at the
eruptive vent is difficult to access and new methods are needed. The use of an infrasonic array
located at Singapore will help to determine the pressure condition at the eruptive vent. And
the location of Singapore with respect to those volcanoes makes it the perfect site to
identify erupting volcanoes based on the wavefront characteristics of the recorded
signal.
There are 346 active or potentially active volcanoes within 4000 kilometers of Singapore.
They have been combined into 23 volcanic zones that have clear azimuth with respect to
Singapore. Each of those zones has been assessed for probabilities of eruptive styles, from
gentle (Volcanic Explosivity Index of 1) to cataclysmic (VEI 8) based on remote
morphologic analysis. Ash dispersal models will be run using wind velocity profiles of the
region for the last 3 years and hypothetical eruption scenarios for the whole range of eruption
explosivities. Results can be used to estimate the likelihood of ash at any location in SE
Asia.
Due to the location of Singapore close to the equator, seasonal changes in the wind
velocity structure of the atmosphere will strongly affect the potential to detect small volcanic
eruptions at certain azimuths. According to its location, each volcanic zone will be associated
with a threshold value (minimum VEI detectable) depending on the seasonality of the wind
velocity profile in the region. |
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