Seismicity and Tremor in a Submarine Hydrothermal Vent Field

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In the summer of 1988 the principal investigator measured microseismicity in and near the hydrothermal vent field of the Endeavor segment of the Juan de Fuca Ridge. A very surprising result was the large number (hundreds) of seismic events that were observed. The principal investigator thinks he has made the first observation of long duration tremor associated with a submarine hydrothermal field. The large number and unusual nature of these events make this data set unique. The principal investigator will: 1) construct a number-of-events vs. relative magnitude curve for as many events as possible; 2) characterize the spectra of the events; and 3) analyze the time variability of the events and compare with high-frequency data from near an active hydrothermal chimney.