Greg in front of model of D/V Chikyu at JAMSTEC -- Photo by John Suppe
During 2006-2008, Greg worked at JAMSTEC in Yokohama, Japan as Advisor to Asahiko Taira, Director General of the Center for Deep Earth Exploration (CDEX). In November, 2007, we completed the first expedition of IODP drilling with D/V Chikyu in the NanTroSEIZE area south of Honshu, Japan. Stage 2 of NanTroSEIZE took place during June-October, 2009, and Stage 3 is scheduled to begin in 2010.
Greg's main research interest is in
the highly deformed belts of rock that develop along convergent plate
margins. This is, in large part, a study of the processes responsible
for mountain building and for the generation of continental crust.
Because most convergent plate margins are expressed as trench-arc
systems in which the zones of active deformation are beneath very deep
water, we must rely largely on marine geological and geophysical remote
sensing techniques. These have included seismic reflection profiling,
high-resolution multibeam bathymetric mapping, and ocean drilling. He
is also interested in giant landslides off the Hawaiian Islands.
During April-May, 2006, we conducted a 3D seismic reflection cruise to the new IODP drilling transect in the Nankai Trough. The data set was collected by PGS using the Nordic Explorer with 4 x 4500m streamers. A full 3D pre-stack depth migration (PSDM) was completed by IFREE/JAMSTEC in November, 2007. An
initial results paper appeared in Science in November, 2007.
A second paper that defines the regional tectonic setting of the NanTro transect was published in the IODP Expedition 314/5/6 Initial Report Volume can be found here.
Other papers from this project include:
Interaction between deformation and fluids in the frontal thrust of the NanTroSEIZE Kumano Transect (G-cubed) by Screaton and others.
Origin and evolution of a splay fault in the Nankai accretionary wedge (Nature Geoscience) by Strasser and others.
Broad, weak regions of the Nankai Megathrust and implications for shallow coseismic slip (EPSL) by Nathan Bangs and others
Intraoceanic thrust in the Nankai Trough off the Kii Peninsula: Implications for intraplate earthquakes (GRL) by Takeshi Tsuji and others.
For more details on Research, scroll to the bottom of
this page.
This is a joint project with Brian Taylor, Andy Goodliffe and Patty Fryer of U.H., Simon Klemperer of Stanford Univ., Doug Wiens of Washington Univ., and Kiyoshi Suyehiro, Yoshiyuki Kaneda and Shuichi Kodaira of JAMSTEC.
Click here for the report of the March-April, 2002 cruises on the R/V Ewing.
The UH group has produced three papers so far:
Emplacement, growth, and gravitational deformation of serp
entinite seamounts on the Mariana forearc (Geophys. Jour. Int.) by Adrienne Oakley and others.
Pacific Plate subduction beneath the central Mariana and Izu-Bonin fo
re arcs: New insights from an old margin (G-cubed) by A. Oakley and others.
A seismic stratigraphic analysis of Mariana forearc basin evolution (G-cubed) by E. Chapp and others.
This is a joint project with JAMSTEC, which provided more than 25 seismic lines across the Nankai Trough and northern Shikoku Basin for graduate student Toshihiro Ike's Ph.D. dissertation.
Two papers were produced from this project:This is a joint study with Nathan Bangs and Tom Shipley at the University of Texas and Casey Moore at UC Santa Cruz. We collected an 8 x 80 km 3-D seismic data volume over the lower slope of the Nankai Trough during June, July and August of 1999.
To see a first description of the data set, click here.
The 3D volume has now been processed through pre-stack time
migration by our UTIG colleagues and several papers have been
published ( Heffernan et al.;
Gulick et al. ;
Bangs et al. )
Additional funding has been received for 3D pre-stack depth migration
of the frontal portion of the 3D volume.
See Costa Pisani et al. for a description of the 3D PSDM work.
This is a joint project with Harold Tobin (New Mexico Tech) and Demian Saffer (Penn State).
During summer of 2000, Greg was co-chief scientist on ODP Leg 190, which drilled into the Nankai accretionary prism.
To check out the Leg 190 Initial Report, click here.For a summary paper published in the AGU on-line publication G-cubed, click here.
And for the Leg 190/196 Scientific Results Volume, click here.
Also, check out the Leg 190/196 Synthesis.
Underwood et al. (2003) presents additional Leg 190 results.
This is a joint project with Juli Morgan. We collected 2000 km of 160-channel seismic reflection data off Kilauea's south flank and 250 km of data off Ko`olau's (Oahu) northeast flank in January- February, 1998.
A preliminary paper, published in 2000 in Geology can be found by clicking here.
A more comprehensive analysis of the seismic reflection lines is presented in an AGU Monograph published in 2001 (see Hills et al. citation below).
Details of the Hilina slump were presented in a 2003 paper that can be seen by clicking here.
A paper that appeared in 2002 in Marine Geology discusses sedimentation adjacent to the Big Island. Click here to see it.
Click here to see a paper that
describes the internal structure of Puna Ridge.
Click here to see a paper on the Wai`anae slump.
A paper by Mike Garcia and others on the Nu`uanu slump can be found here.
The Hui Nalu Sr. Master crew (right) caught a great wave to win by 0.15
sec in the 2004 McFarlane Regatta at Waikiki.
Note the crew in the background that was swamped by the same wave a
minute earlier (photo by T. Ike).
Greg catches a small wave as he
cruises past Koko Crater in his
one-man canoe during a Spring '99
race around Makapu`u to Hawaii Kai.
Photo courtesy of Pacific Paddler Magazine.
Page last modified on: 16 September 2009