Deep sea borehole observatories and Earth science

Author(s): Suyehiro, Kiyoshi
Author Affiliation(s): Primary:
JAMSTEC, Tokyo, Japan
Volume Title: Leading edge of earth science technology
Volume Author(s): Oshima, Shoichi, prefacer
Source: Leading edge of earth science technology, prefaced by Shoichi Oshima. Chigaku Zasshi = Journal of Geography, 109(6), p.907-919. Publisher: Tokyo Geographical Society, Tokyo, Japan. ISSN: 0022-135X CODEN: CGZAAL
Note: In Japanese with English summary. 26 refs.; illus., incl. 2 tables
Summary: To better understand the dynamics of the Earth's interior, we need more observational data from the planet's oceans. In particular, we lack time series data, which require long-term observations. It is essential to probe the Earth not only from the seafloor but also from sub-seafloor boreholes. The reasons are twofold. First, there are geodetic and seismic measurements that should be made in a low-noise environment, preferably within competent rocks. Second, there are many critical measurements that can be made in situ or close to where active bio-geological processes occur. In this regard, we are at a stage where we may make substantial progress. In recent years, a number of successful emplacements of borehole observatories have been made. In 2006, a new type of scientific drilling vessel equipped with a riser capability and blowout prevention to allow deeper drilling than available at present will become part of a major international drilling program. Borehole observatory constructions will be accelerated to complete a truly global seismic network for obtaining clearer tomographic images, to establish regional geodetic networks to monitor strain buildup at plate boundaries, or to set up local multiple-component observatories to understand active processes at hydrothermal vents, fluid flow pathways, or seismogenic zones.
Year of Publication: 2000
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Boreholes; Deep Sea Drilling Project; Drilling; Earth; Geophysical methods; Geophysical profiles; Geophysical surveys; Hydrothermal vents; Instruments; Interior; Observatories; Ocean Drilling Program; Research vessels; Seismic methods; Seismic profiles; Seismographs; Surveys; Velocity structure
Record ID: 2002057326
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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