Autonomous Hydrophone Array Monitors Seismic Activity at Northern Mid-Atlantic Ridge

Details Autonomous Hydrophone Array Monitors Seismic Activity at Northern Mid-Atlantic Ridge Autonomous Hydrophone Array Monitors Seismic Activity at Northern Mid-Atlantic Ridge

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004eostr..85....1s&link_type=abstract

EOS Transactions, AGU, Volume 85, Issue 1, p. 1-5

Physics

Geophysics

2

Marine Geology And Geophysics: Marine Seismics, Oceanography: General: Ocean Acoustics, Seismology: Instruments And Techniques

Scientific paper

The northern Mid-Atlantic Ridge (MAR) is a classic, slow-spreading ridge with an average spreading rate of ~25 mm/yr. The MAR is typically marked by a 1.5-3-km-deep, 15-30-km-wide axial rift valley. Major transforms offset the ridge along its length. Between the transforms, the ridge is divided into spreading segments; their ends are defined by non-transform offsets. The rift valley commonly contains an axial volcanic ridge that is considered to be the predominant site of volcanic activity [e.g., Ballard and van Andel, 1977]. Based on the sizes of the volcanic ridges [e.g., Smith and Cann, 1999], large volumes of lava must be erupted on the valley floor. Currently, however, we do not know how frequently magmatic events occur, whether they migrate along the axis, whether there are spatial patterns in these events, or how they vary through time. Faulting style varies along the length of a segment, with faults having larger throws and wider spacing at segment ends than at centers [e.g., Shaw, 1992]. Off-axis elevated sea floor and residual gravity highs and exposures of lower crustal/upper mantle rocks at the inside corners of segments, rather than at the conjugate outside corners, suggest a cross-axis asymmetry in tectonic extension at the ends of slow-spreading ridges [e.g., Severinghaus and Macdonald, 1988], with most of the extension occurring at the inside corners. Furthermore, there appears to be little, if any, active faulting beyond the crest of the rift mountains that bound the segments, based on the characteristics of fault populations.

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