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Geology; June 2002; v. 30; no. 6; p. 503-506; DOI: 10.1130/0091-7613(2002)030<0503:BOTSTC>2.0.CO;2
© 2002 Geological Society of America
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Breathing of the seafloor: Tidal correlations of seismicity at Axial volcano

Maya Tolstoy1, Frank L. Vernon2, John A. Orcutt2 and Frank K. Wyatt2

1 Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, New York 10964-8000, USA
2 Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, California 92093-0225, USA

Tidal effects on seafloor microearthquakes have been postulated, but the search has been hindered by a lack of continuous long-term data sets. Making this observation is further complicated by the need to distinguish between Earth and ocean tidal influences on the seafloor. In the summer of 1994, a small ocean-bottom seismograph array located 402 microseismic events, over a period of two months, on the summit caldera of Axial volcano on the Juan de Fuca Ridge. Harmonic tremor was also observed on all instruments, and Earth and ocean tides were recorded on tiltmeters installed within the seismometer packages. Microearthquakes show a strong correlation with tidal lows, suggesting that faulting is occurring preferentially when ocean loading is at a minimum. The harmonic tremor, interpreted as the movement of superheated fluid in cracks, also has a tidal periodicity.

Key Words: tides • earthquakes • correlations • Axial Seamount




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