Hydroacoustic monitoring of seismicity at the slow-spreading Mid-Atlantic Ridge

Details Hydroacoustic monitoring of seismicity at the slow-spreading Mid-Atlantic Ridge Hydroacoustic monitoring of seismicity at the slow-spreading Mid-Atlantic Ridge

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..13s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 13-1, CiteID 1518, DOI 10.1029/2001GL013912

Physics

Geophysics

11

Marine Geology And Geophysics: Midocean Ridge Processes

Scientific paper

In February 1999, long-term hydroacoustic monitoring of the northern Mid-Atlantic Ridge (MAR) was initiated. Six autonomous hydrophones were moored between ~15°N and ~35°N on the flanks of the MAR. Results from the first year of data reveal that there is significant variability in along-axis event rate. Groups of neighboring segments behave similarly, producing an along-axis pattern with high and low levels of seismic activity at a wavelength of ~500 km. This broad scale pattern is likely influenced by the axial thermal regime. Several earthquake sequences with variable temporal characteristics were detected, suggesting fundamental differences in the cause of their seismicity. Off-axis, most seismic faulting occurs within a zone < 15 km from the axis center.

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