1998 eruption of axial volcano: Multibeam anomalies and sea-floor observations
Abstract
Lava flows erupted during the January/February 1998 seismic swarm at Axial Volcano on the Juan de Fuca Ridge have been identified by differencing of pre- and post-event multibeam bathymetric surveys and by seafloor observations. A sheet flow more than 3 km in length and 500-800 m wide erupted from the uppermost south rift is the site of a robust hydrothermal system. 1998 lavas occur over about 9 km of the upper south rift zone, or about 20% of the along-axis length of the seismicity event (∼50 km). The estimated volume of lava erupted is 18-76 ×106 m³ for the extrusion and 100-×106 m³ for the intrusion. The total volume is consistent with the volume from modeling of seafloor strain measurements recorded during the event.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- December 1999
- DOI:
- 10.1029/1999GL002328
- Bibcode:
- 1999GeoRL..26.3425E
- Keywords:
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- Marine Geology and Geophysics: Midocean ridge processes;
- Marine Geology and Geophysics: Seafloor morphology and bottom photography;
- Volcanology: Magma migration