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| Titel |
An operational approach for infrasound multi-array processing |
| VerfasserIn |
J. Vergoz, A. Le Pichon, P. Herry, E. Blanc |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250031224
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| Zusammenfassung |
| The infrasound network of the International Monitoring Network (IMS) of the
Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) is currently not fully
established. However, it has demonstrated its capability for detecting and locating
infrasonic sources like meteorites as well as volcanic eruptions on a global scale.
Unfortunately, such ground truth events are rare. Therefore, regions with dense
infrasound networks have to be considered in order to test and calibrate detection
and location procedures (Le Pichon. et al. 2008, J. Geophys. Res., 113, D12115,
doi:10.1029/2007JD009509).
In Central Europe, several years of continuous infrasound recordings are available for
many infrasound arrays, where not all of them are part of the IMS. Infrasound waveforms are
routinely processed in the 0.1 to 4 Hz frequency band using PMCC as a real-time detector.
After applying a categorization procedure to remove detections associated with
environmental noise, a blind fusion provides a list of events to be reviewed by the
analyst. In order to check the geophysical consistency of the located events, an
interactive tool has been developed. All results of the automatic processing are
presented along with a realistic estimate of the network detection capability which
incorporates near-real time atmospheric updates. Among the dominant acoustic
sources of human origin, peaks in the geographical distribution of infrasound events
correspond well with seismically active regions where operational mines have been
identified.
With the increasing number of IMS and regional cluster infrasound arrays deployed
around the globe, conducting consistent analyses on a routine-basis provides an extensive
database for discriminating between natural and artificial acoustic sources. Continuing such
studies may also help quantifying relationships between infrasonic observables and
atmospheric specification problems, thus opening new fields for investigations into inverse
problems. |
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