![]() |
![]() |
|||||||
|
||||||||
|
Pioneer in Marine Geophysics Honored
Some of the early systematic studies of this challenging environment were conducted by Elizabeth (Betty) Bunce, a pioneer in marine geophysics and a Senior Scientist at the Woods Hole Oceanographic Institution (WHOI) until her retirement in 1980. Recent technological advances enable scientists to map the shape of the sea floor at these great depths by using the multibeam-bathymetry technique, which produces detailed morphology and a reflectivity image along a swath several miles wide on either side of the ship's track. The swaths are then "mosaicked," or merged together, to produce a topographic map of the sea floor and detailed shaded-relief and reflectivity images, which are akin to slanted aerial photographs on land. Recent exploration of the trench funded by the National Oceanic and Atmospheric Administration (NOAA)'s Office of Ocean Exploration was conducted by a team from the U.S. Geological Survey (USGS) and the University of New Hampshire (UNH). This joint effort has produced for the first time a high-resolution (150-m [500-ft] pixel size) map of part of the floor of the Puerto Rico Trench. The part mapped, a quarter of the total trench area, is about the size of New Jersey. One of the big discoveries from this mapping effort is a large active tectonic fault system at the bottom of the trench, where the Atlantic and Caribbean tectonic plates slide past each other. This fault system is several hundred miles long, and its activity has produced escarpments and depressions that are several hundreds of feet tall and deep, respectively. The new fault system was named the Bunce Fault, in honor of Dr. Bunce.
The ceremony took place at Dr. Bunce's current residence at the Heritage Assisted Living Community in Falmouth, MA. Also present were Hartley Hoskins, Dave Du Bois, and Dicky Allison of WHOI and Dann Blackwood of the USGS. The ever sharp and vivacious Dr. Bunce shared some of her seagoing stories and her opinion of some of her old colleagues, to the delight of the small crowd. She expressed a keen interest in the present state of knowledge and read a summary of recent models for the formation of this deep trench. Continued mapping of the entire trench area, stretching from north of the Dominican Republic to the Lesser Antilles, is planned for February and March of this year, after which a complete map of the sea floor will be presented to Dr. Bunce.
|
![]() |
![]()
in this issue: Congressional Briefing on Gas Hydrates Volcanic Ash and Aviation Safety International Deep-Sea Corals Workshop Northeastern Coastal Ecosystems and Resources Workshop
Coastal and Marine Scientists Win 2002 Shoemaker Product Excellence Awards Behrendt and Poag Elected AAAS Fellows Marine Geophysics Pioneer Honored Celebrating Careers of Five Retirees Manheim Lectures on Trends in Scientific and Technological Innovation
Effectivenes of Marine Reserves in Central California Human Influence on Diatom Productivity and Sedimentation in Chesapeake Bay ![]() |