Abstract
We designed a new pop-up type Ocean Bottom Seismometer (OBS) in order to study micro-earthquakes in off-shore areas. With a 57 cm O.D. sphere of high tension aluminium alloy, the OBS system, including one vertical and one horizontal geophone, can safely operate on ocean floors of up to 6000 m depth for seismic observations. The amplified seismic data and the time code are directly recorded on the four-channel cassette deck for periods of up to one month. The frequency response curve throughout the recording and play-back system is flat for the range, 1–15 Hz (−3 dB). The anchor release and the geophone clamp are operated by an acoustic command signal.
So far, we have deployed our OBS's 42 times in the ocean. All of the OBS's deployed have been recovered safely. Seismic data has provided seismological evidence for a number of processes associated with tectonism along subduction zones and spreading ridges (e.g., Eguchi et al., 1986).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Eguchi, T., Fujinawa, Y., and Ishihara, N.: 1983, ‘Clock Correction System for the Pop-up Type Ocean Bottom Seismometer’, J. Seismol. Soc. Japan 36, 635–642 (in Japanese).
Eguchi, T., Fujinawa, Y., and Sato, H.: 1984, ‘Acoustic Locating and Controlling System for the Deployment and Recovery of OBS’, Rep. National Res. Center for Disaster Prevention, Japan 33, 69–76 (in Japanese).
Eguchi, T., Fujinawa, Y., M. Ukawa, and Bibot, L.: 1986 (in press), ‘Microearthquakes along the Back Arc Spreading System in the Eastern Bismarck Sea’, Geo-Marine Letters.
Kasahara, J., Koresawa, S., Nagumo, S., Daikubara, T., Hara, T., and Ando, S.: 1979, ‘Pop-up OBS (ERI type P-79)’, Bull Earthq. Res. Inst., Univ. of Tokyo, Japan 54, 515–530 (in Japanese).
Ukawa, M., Fujinawa, Y., Sugiyama, S., and Osawa, M.: 1985a, ‘40 MHz Radio Beacon and Flashing Light for Pop-up Ocean Bottom Seismometers’, J. Seismol. Soc. Japan 37, 671–674 (in Japanese).
Ukawa, M., Eguchi, T., and Fujinawa, Y.: 1985b, ‘Microseismicity in and around Suruga Bay Revealed by an Array Observation of Ocean Bottom Seismometers’, J. Seismol. Soc. Japan 38, 381–397 (in Japanese).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Eguchi, T., Fujinawa, Y., Matsuzaki, T. et al. New pop-up type Ocean Bottom Seismometer. Marine Geophysical Researches 8, 187–199 (1986). https://doi.org/10.1007/BF00338228
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00338228