Premium
1998 eruption of axial volcano: Multibeam anomalies and sea‐floor observations
Author(s) -
Embley R. W.,
Chadwick W. W.,
Clague D.,
Stakes D.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl002328
Subject(s) - geology , lava , seafloor spreading , volcano , seismology , bathymetry , ridge , rift , induced seismicity , lava dome , volcanology , mid ocean ridge , geophysics , basalt , tectonics , oceanography , paleontology
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 ×10 6 m³ for the extrusion and 100‐×10 6 m³ for the intrusion. The total volume is consistent with the volume from modeling of seafloor strain measurements recorded during the event.