Fingerprints of the September 2005 Da'Ure Volcanic Eruption in the Afar Depression as Recorded on the FURI Broadband Seismic Station
Abstract
The displacement seismograms on the horizontal components of the FURI broadband seismic station for the Da'Ure volcanic eruption of September 2005 showed several ultra-long period signals (> 5 minutes) at a distance of > 250 km. The horizontal components of broadband seismographs are highly sensitive to tilt, suggesting that the FURI seismic station recorded important tilt information associated with the diking and magma intrusion process. Tilts are indicative of inflation and deflation processes. Several ultra-long period signals are recoded on the horizontal components before the major eruption on the 26 of September. Four main types of seismic signal have been recognized from the FURI broadband record for the Da'Ure volcanic eruption of September 2005: volcano-tectonic (VT) earthquakes, long period earthquakes, hybrid earthquakes, and explosion signals. Before 25 September the VT type of events dominated the record while a mix of others came into existence there after. The long-period part of the hybrid events have a monochromatic signal with longer duration and modulated amplitudes. The long period records which are believed to indicate increased gas pressure in a volcano, are observed until the 28th of September which shows that the activity didn't stop abruptly after the major eruption. These fingerprint seismic records can be used in the future for monitoring volcanic activity in the Afar region.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2006
- Bibcode:
- 2006AGUFM.T41B1563A
- Keywords:
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- 1209 Tectonic deformation (6924);
- 1243 Space geodetic surveys;
- 3035 Midocean ridge processes;
- 3614 Mid-oceanic ridge processes (1032;
- 8416);
- 8109 Continental tectonics: extensional (0905)