of 1 /1
544 D. SubmarineGeology and Geophysics OLR (1988) 35 (6) are described, and earthquake location uncertainty, magnitude smoothing and distance smoothing, and the parameters controlling smoothing are discussed. (hbf) 88:3412 Faure, Gunter (ed.), 1987. New developments and applications in isotope geoscience. A selection of papers presented at an open session during the Sixth International Conference on Geochronol- ogy, Cosmochronology and Isotope Geology (ICOG IV), Cambridge, Great Britain, June 30 to July 4, 1986. Chem. Geol., 66(1-2):177pp; 17 papers. Topics covered at the open session included new instrumentation and calibration, analytical tech- niques, and new applications and discoveries. Six of the selected papers deal with various aspects of the 4°mr/39Ar technique and dating standards and an- other four treat U-Pb geochronology. Other papers consider the Rb--Sr and K-Ca isotope systematics of the Prairie Evaporite (Canada), ~4C in radioactive ores, J80 in the analysis of water, 3He in terrestrial rocks, xenon isotopes in pitchblendes, fission track dating calibration, and a proposal for using non- parametric estimations involving small data sets in isotope geoscience. (hbf) 88:3413 Fujinawa, Yukio, Michinori Kubota, Takao Eguchi and Motoo Ukawa, 1987. A direct recording pop-up type ocean bottom seismograph: CDPOBS lla. Rept natn. Res. Cent. Disaster Prevent., Tokyo, 39:19-35. This free-fall, pop-up instrument is capable of recording three components of seismic data for 40 days on a 14-channel open-reel magnetic tape recorder. Seismic signals from one vertical and two horizontal 4.5 Hz geophones mounted on a me- chanical gymbal are amplified in three stages and recorded separately. The vertical component is further branched to pass through an equalized amplifier to pick up the low frequency component. After a pre-set time interval or upon receiving an acoustic command, either of two gas-pressure pis- ton-type releasers make the vessel ascend. Posi- tioning of the OBS can be conducted with an acoustic transponder. Natl. Res. Center for Disaster Prevention, Japan. 88:3414 Kim, S.-R., H.-R. Yoo, G.-T. Park, Y.-K. Lee and C.-H. Ann, 1987. Digital processing and acoustic backscattering characteristics on the seafloor image by side scan sonar. J. oceanol. Soc. Korea, 22(3):143-152. (In Korean, English abstract.) KORDI, Ansan, P.O. Box 29, Seoul 171-14, Korea. 88:3415 Magnitski, V.A. and E.M. Chesnokov (eds.), 1986. Geophysics of anisotropic media: the state of the art. Phys. solid Earth (a translation of Fiz. Zemli), 22(11):867-960; 17 papers. The introduction reviews the development of seismic anisotropy on various scales by considering data on the elastic anisotropy of rock, deep seismic sound- ings, seismic observations on body waves and surface waves; theoretical studies of wave propa- gation, and the causes of the formation of ordered media. The remainder of the papers are presented in four sections treating: theoretical aspects of seismic wave propagation in anisotropic media--wave fields, dispersion, use of the matrix method, and numerical simulation; formation mechanisms of seismic ani- sotropy of the lithosphere--in the ocean upper mantle and at reflecting boundaries; studies using ultrasonic illumination--the acoustopolarization method, in granitoids, in thin-layered models, and in the crystalline basement; and investigations using seismic surveying methods. (hbf) 88:3416 Nakamura, Yosio, P.L. Donoho, P.H. Roper and P.M. McPherson, 1987. Large-offset seismic surveying using ocean-bottom seismographs and air guns: instrumentation and field technique. Geophysics, 52(12):1601-1611. Repeatable, closely spaced signal sources from large-capacity air guns and detection and recording of signals using highly flexible, microprocessor- controlled, digital ocean-bottom seismographs give high-quality, large-offset, marine seismic refraction and reflection data readily adaptable to various processing techniques originally developed for seis- mic reflection data. There are several requirements and problems specific to the technique, i.e., bubbly signals from one or two large-capacity air guns are often preferable to bubble-suppressed signals from tuned arrays in identifying weak arrivals at large offset distances. Recorded water-wave signals at near ranges provide precise locations of detectors relative to shots. Inst. for Geophys., Univ. of Texas, 8701 North Mopac Blvd., Austin, TX 78759-8345, USA. D50. Subsurface structure 88:3417 Kelamis, P.G. (comment), G.G. Drijkoningen and J.T. Fokkema (reply), 1987. [Discussion ofl 'The

New developments and applications in isotope geoscience

Embed Size (px)

Citation preview

544 D. Submarine Geology and Geophysics OLR (1988) 35 (6)

are described, and earthquake location uncertainty, magnitude smoothing and distance smoothing, and the parameters controlling smoothing are discussed. (hbf)

88:3412 Faure, Gunter (ed.), 1987. New developments and

applications in isotope geoscience. A selection of papers presented at an open session during the Sixth International Conference on Geochronol- ogy, Cosmochronology and Isotope Geology (ICOG IV), Cambridge, Great Britain, June 30 to July 4, 1986. Chem. Geol., 66(1-2):177pp; 17 papers.

Topics covered at the open session included new instrumentation and calibration, analytical tech- niques, and new applications and discoveries. Six of the selected papers deal with various aspects of the 4°mr/39Ar technique and dating standards and an- other four treat U-Pb geochronology. Other papers consider the Rb--Sr and K-Ca isotope systematics of the Prairie Evaporite (Canada), ~4C in radioactive ores, J80 in the analysis of water, 3He in terrestrial rocks, xenon isotopes in pitchblendes, fission track dating calibration, and a proposal for using non- parametric estimations involving small data sets in isotope geoscience. (hbf)

88:3413 Fujinawa, Yukio, Michinori Kubota, Takao Eguchi

and Motoo Ukawa, 1987. A direct recording pop-up type ocean bottom seismograph: CDPOBS lla. Rept natn. Res. Cent. Disaster Prevent., Tokyo, 39:19-35.

This free-fall, pop-up instrument is capable of recording three components of seismic data for 40 days on a 14-channel open-reel magnetic tape recorder. Seismic signals from one vertical and two horizontal 4.5 Hz geophones mounted on a me- chanical gymbal are amplified in three stages and recorded separately. The vertical component is further branched to pass through an equalized amplifier to pick up the low frequency component. After a pre-set time interval or upon receiving an acoustic command, either of two gas-pressure pis- ton-type releasers make the vessel ascend. Posi- tioning of the OBS can be conducted with an acoustic transponder. Natl. Res. Center for Disaster Prevention, Japan.

88:3414 Kim, S.-R., H.-R. Yoo, G.-T. Park, Y.-K. Lee and

C.-H. Ann, 1987. Digital processing and acoustic backscattering characteristics on the seafloor image by side scan sonar. J. oceanol. Soc. Korea, 22(3):143-152. (In Korean, English abstract.)

KORDI, Ansan, P.O. Box 29, Seoul 171-14, Korea.

88:3415 Magnitski, V.A. and E.M. Chesnokov (eds.), 1986.

Geophysics of anisotropic media: the state of the art. Phys. solid Earth (a translation of Fiz. Zemli), 22(11):867-960; 17 papers.

The introduction reviews the development of seismic anisotropy on various scales by considering data on the elastic anisotropy of rock, deep seismic sound- ings, seismic observations on body waves and surface waves; theoretical studies of wave propa- gation, and the causes of the formation of ordered media. The remainder of the papers are presented in four sections treating: theoretical aspects of seismic wave propagation in anisotropic media--wave fields, dispersion, use of the matrix method, and numerical simulation; formation mechanisms of seismic ani- sotropy of the lithosphere--in the ocean upper mantle and at reflecting boundaries; studies using ultrasonic illumination--the acoustopolarization method, in granitoids, in thin-layered models, and in the crystalline basement; and investigations using seismic surveying methods. (hbf)

88:3416 Nakamura, Yosio, P.L. Donoho, P.H. Roper and

P.M. McPherson, 1987. Large-offset seismic surveying using ocean-bottom seismographs and air guns: instrumentation and field technique. Geophysics, 52(12):1601-1611.

Repeatable, closely spaced signal sources from large-capacity air guns and detection and recording of signals using highly flexible, microprocessor- controlled, digital ocean-bottom seismographs give high-quality, large-offset, marine seismic refraction and reflection data readily adaptable to various processing techniques originally developed for seis- mic reflection data. There are several requirements and problems specific to the technique, i.e., bubbly signals from one or two large-capacity air guns are often preferable to bubble-suppressed signals from tuned arrays in identifying weak arrivals at large offset distances. Recorded water-wave signals at near ranges provide precise locations of detectors relative to shots. Inst. for Geophys., Univ. of Texas, 8701 North Mopac Blvd., Austin, TX 78759-8345, USA.

D50. Subsurface structure

88:3417 Kelamis, P.G. (comment), G.G. Drijkoningen and

J.T. Fokkema (reply), 1987. [Discussion ofl 'The