Mitobs: A seismometer system for ocean-bottom earthquake studies |
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Authors: | Paul J Mattaboni Sean C Solomon |
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Institution: | (1) Dept. of Earth and Planetary Sciences, Massachusetts Institute of Technology, 02139 Cambridge, Mass, U.S.A. |
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Abstract: | The MIT ocean-bottom seismometer is a free-fall, pop-up instrument capable of recording three components of seismic data on the sea floor for periods of at least one month. Data are recorded in digital format on a specially designed magnetic tape recorder. An event recording scheme and semiconductor memories assure both efficient data storage and preservation of first motion information. Sensors and recording electronics are housed in a cylindrical pressure vessel, which sits vertically atop an expendable base plate on the ocean bottom. Attached to the pressure case are three glass spheres for buoyancy. After a pre-set time interval, a motor-driven mechanical latch release frees the instrument to float to the ocean surface for recovery. |
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