Laura Brothers, Ph.D.
I work on a variety of topics including coastal and shelf evolution, regional geologic framework studies, shallow geohazards and permafrost.
Biography
Dr. Laura Brothers is a marine geologist at the USGS Woods Hole Coastal and Marine Science Center. She studies how the seafloor, and the earth beneath the seafloor change with time and major events. From the shores of the Arctic, Gulf of Maine, Mid-Atlantic and to the deep sea Laura has worked in teams that have geologically mapped tens of thousands of kilometers of the seabed using geophysical and advanced imaging data. Laura led the DOI Hurricane Sandy supplemental project focused on defining the geologic framework offshore of the Delmarva Peninsula. She is the Project Chief of the Geologic Mapping: Links to Coastal Vulnerability and Hazards project.
Education
2010-2012, National Energy Technology Laboratory-National Research Council Postdoctoral Methane Hydrate Fellow
Ph.D., 2010, Earth Sciences, University of Maine
M.S., M.S., 2006, Oceanography, Marine Policy, University of Maine
B.S., 2002, Geology, West Virginia University
A.B., 2001, Sociology, Geology (Minor), Spanish (Minor), Bryn Mawr College
Publications
Research Interests
The coastal zone and outer continental shelf contain many resources and are subject to a multitude of competing uses. Currently over one third of the nation’s population lives in coastal shoreline counties and this fraction is projected to grow within the next decade. In addition, resource recovery and development efforts (e.g., wind and tidal power, turbine and pilings placement, energy exploration and distribution infrastructure, fishing grounds and sand resources) continue to escalate along the entire continental shelf. Erosion, impacts of severe storms and hurricanes, shoreline change related to sea-level rise threaten human capital and infrastructure. Uncertainty regarding the frequency and distribution of potential hazards and resources endangers coastal communities and inhibits sound development. Managers and scientists often lack the information that resolves sediment abundance, seafloor or shallow geohazards (e.g. scour, natural gas), sea-level histories, substrate heterogeneity and other regionally variable characteristics that impact the Nation’s use of this region. By collecting and interpreting geologic data on a regional-scale we can characterize an area’s associated resources and potential hazards and begin to quantify the processes that shape the continental shelf and link it to coastal evolution.
Science and Products
Hurricane Sandy Response- Linking the Delmarva Peninsula's Geologic Framework to Coastal Vulnerability
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. In order to better constrain controls on coastal vulnerability and evolution, the region’s sediment sources, transport pathways and sediment sinks must be identified. This project defines the geologic framework of the Delmarva coastal system through...
Geologic Mapping of the Massachusetts Seafloor
The U.S. Geological Survey, in cooperation with the Massachusetts Office of Coastal Zone Management (CZM) is conducting geologic mapping of the sea floor to characterize the surface and shallow subsurface geologic framework within the Massachusetts coastal zone. The long-term goal of this mapping effort is to produce high-resolution geologic maps and a Geographic Information System (GIS) that...
Sand ridge morphology and bedform migration patterns derived from bathymetry and backscatter on the inner-continental shelf offshore of Assateague Island, USA
The U.S. Geological Survey and the National Oceanographic and Atmospheric Administration conducted geophysical and hydrographic surveys, respectively, along the inner-continental shelf of Fenwick and Assateague Islands, Maryland and Virginia over the last 40 years. High resolution bathymetry and backscatter data derived from surveys over the...
Pendleton, Elizabeth; Brothers, Laura; Thieler, E. Robert; Sweeney, Edward Observations of pockmark flow structure in Belfast Bay, Maine, Part 1: current-induced mixing
Field observations of current profiles and temperature, salinity, and density structure were used to examine vertical mixing within two pockmarks in Belfast Bay, Maine. The first is located in 21 m water depth (sea level to rim), nearly circular in shape with a 45 m rim diameter and 12 m rim-to-bottom relief. The second is located in 25 m water...
Fandel, Christina L.; Lippmann, Thomas C.; Irish, James D.; Brothers, Laura L. Observations of pockmark flow structure in Belfast Bay, Maine, Part 2: evidence for cavity flow
Pockmark flow circulation patterns were investigated through current measurements along the rim and center of two pockmarks in Belfast Bay, Maine. Observed time-varying current profiles have a complex vertical and directional structure that rotates significantly with depth and is strongly dependent on the phase of the tide. Observations of the...
Fandel, Christina L.; Lippmann, Thomas C.; Foster, Diane L.; Brothers, Laura L. Observations of pockmark flow structure in Belfast Bay, Maine, Part 3: implications for sediment transport
Current observations and sediment characteristics acquired within and along the rim of two pockmarks in Belfast Bay, Maine, were used to characterize periods of sediment transport and to investigate conditions favorable to the settling of suspended sediment. Hourly averaged Shields parameters determined from horizontal current velocity profiles...
Fandel, Christina L.; Lippmann, Thomas C.; Foster, Diane L.; Brothers, Laura L. High-resolution geophysical data collected along the Delmarva Peninsula 2014, U.S. Geological Survey Field Activity 2014-002-FA
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. A U.S. Geological Survey cruise was conducted in the summer of 2014 to map the inner continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework...
Pendleton, Elizabeth; Ackerman, Seth D.; Baldwin, Wayne E.; Danforth, William W.; Foster, David S.; Thieler, E. Robert; Brothers, Laura Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data
Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies...
Brothers, Laura; Herman, Bruce M.; Hart, Patrick E.; Ruppel, Carolyn D. Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints
Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore extent. Most usable borehole data were acquired on a ∼...
Ruppel, Carolyn D.; Herman, Bruce M.; Brothers, Laura L.; Hart, Patrick E. Pockmarks in Passamaquoddy Bay, New Brunswick, Canada
Pockmarks are seafloor depressions associated with fluid escape (Judd & Hovland 2007). They proliferate in the muddy seafloors of coastal Gulf of Maine and Bay of Fundy, where they are associated with shallow natural gas likely of biogenic origin (Ussler et al. 2003; Rogers et al. 2006; Wildish et al. 2008). In North America, shallow-water...
Brothers, Laura; Legere, Christine; Hughes Clark, J.E.; Kelley, J.T.; Barnhardt, Walter; Andrews, Brian; Belknap, D.F.
High-resolution geophysical data collected along the Delmarva Peninsula 2014, USGS Field Activity 2014-002-FA
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. A USGS cruise was conducted in the summer of 2014 to map the inner-continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework that governs coastal...
Pendleton, Elizabeth E.; Ackerman, Seth D.; Baldwin, Wayne E.; Danforth, William W.; Foster, David S.; Thieler, E. Robert; Brothers, Laura L.
National Oceanic and Atmospheric Administration hydrographic survey data used in a U.S. Geological Survey regional geologic framework study along the Delmarva Peninsula
The U.S. Geological Survey initiated a research effort in 2014 to define the geologic framework of the Delmarva Peninsula inner continental shelf, which included new data collection and assembly of relevant extant datasets. Between 2006 and 2011, Science Applications International Corporation, under contract to the National Oceanic and Atmospheric...
Pendleton, Elizabeth A.; Brothers, Laura L.; Thieler, E. Robert; Danforth, William W.; Parker, Castle E. Evidence for extensive methane venting on the southeastern U.S. Atlantic margin
We present the first evidence for widespread seabed methane venting along the southeastern United States Atlantic margin beyond the well-known Blake Ridge diapir seep. Recent ship- and autonomous underwater vehicle (AUV)–collected data resolve multiple water-column anomalies (>1000 m height) and extensive new chemosynthetic seep communities at...
Brothers, L.L.; Van Dover, C.L.; German, C.R.; Kaiser, C.L.; Yoerger, D.R.; Ruppel, C.D.; Lobecker, E.; Skarke, A.D.; Wagner, J.K.S. Cold-seep habitat mapping: high-resolution spatial characterization of the Blake Ridge Diapir seep field
Relationships among seep community biomass, diversity, and physiographic controls such as underlying geology are not well understood. Previous efforts to constrain these relationships at the Blake Ridge Diapir were limited to observations from piloted deep-submergence vehicles. In August 2012, the autonomous underwater vehicle (AUV) Sentry...
Wagner, Jamie K.S.; McEntee, Molly H.; Brothers, Laura L.; German, Christopher R.; Kaiser, Carl L.; Yoerger, Dana R.; Van Dover, Cindy Lee