RESEARCH INTERESTS:

        I find the petrologic and tectonic evolution of active oceanic plate margins, mostly convergent margin systems of the Western Pacific, particularly fascinating. I've worked on the tectonics and metamorphism of supra-subduction zone regions and the associated production of serpentine mud volcanoes in convergent margin settings.  These phenomena bear on problems related to geochemical mass balance in the plate tectonic cycle.  I'm also working on aspects of rifting in suprasubduction zone regions.  This has maintained my interest in mid-ocean ridge crest structural and petrologic processes and, of course, seafloor volcanism.  My recent participation on IODP Expedition 305 provided an opportunity to make comparisons of the nature of metamorphic processes in the mid-ocean ridge environment with that at convergent margins.  Serpentinization occurs in both, but differences between the process in the two environments will tell us a great deal about geochemical cycles associated with plate tectonics. In addition to working with seafloor samples, one of the techniques I've used to engage in this sort of research is remote sensing, mainly side-scan sonar imagery and bathymetric studies of seafloor textures and morphology.  I like to be able to do field work in the deep oceans, hence my interest in deep submergence science and deep ocean drilling.  For the future, I see a burgeoning growth in the effort to instrument the ocean floor and the development of seafloor observatories.  As a consequence, I am interested in the design of precision coring devices and of mini-CORKing devices for gravity and piston core holes to augment ODP drilling sites that house down-hole observatories.

FIELD EXPERIENCE:

38 marine geophysical/geological research cruises:
9 months as shipboard scientist aboard R/V KANA KEOKI (9 cruises, 1971-1980)
1 month total as shipboard scientist aboard R/V TERI TU and R/V NOI'I (2 cruises, 1972 &1974)
3 months as co-chief scientist aboard R/V KANA KEOKI (4 cruises, 1981 -1985)
2 months as shipboard scientist aboard D/V GLOMAR CHALLENGER (1 cruise, 1978)
4 days aboard chartered yacht (side-scan sonar and bottom photography surveys of Rabaul Caldera, PNG, 1985)
1  day dredge sampling Rabaul caldera aboard R/V MOANA WAVE (1985)
1 month total as chief scientist aboard R/V ATLANTIS II directing ALVIN submersible operations (2 cruises, 1987)
1 month total as co-chief scientist aboard R/V ATLANTIS II assisting in directing ALVIN submersible operations (2 cruises, 1987)
1 week as chief scientist aboard R/V FRED H. MOORE (1 cruise, 1987)
2  weeks as shipboard scientist aboard R/V HAKUHO MARU (1 cruise, 1987)
2  months  as co-chief scientist on JOIDES Resolution, ODP Leg 125 (1989)
3  weeks as shipboard scientist aboard R/V Thomas Washington, (Dec. 1991)
2 weeks as co-chief scientist on Yokosuka/Shinkai 6500. Invited to participate on Japan-US cooperative diving efforts in the Mariana forearc (Nov. 1992)
2 weeks as co-chief scientist on Yokosuka/Shinkai 6500. Invited to participate on Japan-US cooperative diving efforts in the Mariana forearc as co-chief scientist (Sept. - Oct. 1993)
2 weeks as co-chief scientist on Yokosuka/Shinkai 6500. Invited to participate on Japan-US cooperative diving efforts in the Mariana forearc as co-chief scientist (Sept. 1995)
4.5 weeks as chief scientist of R/V Thomas G Thompson ROV (Jason, WHOI) and coring cruise in the Mariana forearc  (Jan.- Mar, 1997).
2.5 weeks aboard the R/V Moana Wave as chief scientist (Aug. - Sept., 1997)
4 day equipment testing aboard the R/V Melville (chief scientist Nov 30-Dec. 3, 1999)
3.5 weeks scheduled aboard the R/V Melville (chief scientist Feb. 10 - Mar. 1, 2001)
3 weeks aboard the Joides Resolution Mar. 2001
6 weeks aboard R/V Ewing
55-day cruise on the R/V Thompson as Chief Scientist to do DSL-120 and Jason2 work on Mariana forearc
      seamounts (2003)
IODP Expedition 305, 2 months as Scientific Shipboard Participant (Lead Metamorphic Petrologist) Jan. 8 to Mar. 2, 2005.
3 weeks as co-chief scientist on Yokosuka/Shinkai 6500 to participate in diving efforts in the Mariana backarc basin (July. - Aug. 2005)

field work on Papuan ophiolite sequence, PNG (1977)
field work on active volcanoes of the Mariana island arc (1978-1987)
field work on ash distribution of 1937 Vulcan eruption, Rabaul, PNG (1985)
field work in serpentinite terrains of central California (1985-1988, 2005)
field work on Guam tectonics (1981-1997)

Duties on geophysical research cruises have included directing acquisition of data from the Hawaii Institute of Geophysics side-scan sonar and bathymetry mapping systems SeaMARC II and HMR-1 and from multi-beam bathymetry systems (SeaBeam, Hydrosweep, Japanese systems, EM300), directing rock dredging operation, onboard petrographic analysis of rocks, planning and directing ALVIN submersible research (14 dives) and , planning and directing Jason/Medea ROV submersible research (5 lowerings), planning and directing ODP Leg 125 and assisting in planing and directong Site 1200 operations on ODP Leg 195, directing and assisting in piston and free-fall sediment coring, analysis for biological assemblages and sedimentary characteristics of cores, assisting in heat flow probe deployment and analysis of heat flow recordings, assisting in deployment of ocean bottom seismometers and sonobuoy recorders, directing and assisting marine seismic experiments using explosive charges and airguns, interpretation of seismic records, monitoring navigational equipment, including satellite navigation systems, LORAN-C, GPS, and mini-rangers, monitoring bathymetric profiling equipment and multi-beam bathymetry systems (SeaMARC II, SeaBeam, Hydrosweep, Japanese multinarrow-beam, and EM300 systems), geologic interpretation of seismic reflection profiles, digitizing bathymetric reflection profiles and bathymetry contour maps, production of bathymetric charts both by hand from reflection profile data and using a variety of modern software packages, tectonic interpretation of bathymetry and side-scan data initial processing of MCS data collected aboard the R/V Ewing.

Shore-based work has included chemical analysis of rock samples (primarily basalt and peridotite samples) for major and trace elements using the following techniques:  Atomic Absorption Spectrophotometry (Hawaii Institute of Geophysics), X-Ray Diffraction (Hawaii Institute of Geophysics), X-Ray Fluorescence (Hawaii Institute of Geophysics and Scripps Institution of Oceanography), Scanning Electron Microscopy, (Virginia Institute of Marine Sciences - for undergraduate senior thesis;  Hawaii Institute of Geophysics), Electron Microprobe (Hawaii Institute of Geophysics; Princeton University), Induction Coupled Plasma Spectrophotometry (Lamont-Doherty Geological Observatory), and Rare Earth analysis by Isotope Dilution Mass-spectrometry (Hawaii Institute of Geophysics) and Induction Coupled Plasma Spectrophotometry (Lamont-Doherty Geological Observatory), Raman spectyroscopy with S. Sharma at University of Hawaii.