Duke University, Division of Earth and Ocean Sciences Nicholas School of the Environment and Earth Sciences Center for Nonlinear and Complex Studies PO Box 90227, Durham, NC 27708 United States
U.S. Geological Survey, Woods Hole Field Center, Woods Hole, MA 02543-1548 United States ;
Duke University, Division of Earth and Ocean Sciences Nicholas School of the Environment and Earth Sciences Center for Nonlinear and Complex Studies PO Box 90227, Durham, NC 27708 United States
U.S. Geological Survey, Woods Hole Field Center, Woods Hole, MA 02543-1548 United States ;