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USGS CMG 2009-037-FA Metadata

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ID 2009-037-FA
Also Known As R-37-09-ME
2009-037-FA
Abstract United States Geological Survey, Woods Hole, Massachusetts. Chief Scientist: Walter Barnhardt. Seismic profiling; data of field activity 2009-037-FA (R-37-09-ME) in Penobscot Bay, Maine, Gulf of Maine, United States, North America, North Atlantic from 07/25/2009 to 07/31/2009
Organization United States Geological Survey, Woods Hole, Massachusetts
Project/Theme Penobscot River Sampling
Chief Scientist Walter Barnhardt
Activity Type Seismic profiling;
Platform Rafael
Owner Usgs-woods Hole, Ma
Area of Operation Penobscot Bay, Maine, Gulf of Maine, United States, North America, North Atlantic, Maine
Bounding Coordinates
47.25000
-71.00000     -66.75000
43.25000
Ports LEAVE Belfast, ME
ARRIVE Belfast, ME
Dates 07/25/2009 (JD 206) to 07/31/2009 (JD 212)
Analog Materials No analog holdings.
Information Specialist
Brian Andrews
Crew
Walter Barnhardt Chief Scientist
Laura Brothers University of Maine, Chief Scientist
Barry Irwin Emile Bergeron, and Bill Danforth
Purpose
Complete high-resolution seismic survey of pockmark field.  Sub-bottom only with 
EdgeTech 424 in primary study area.
Information to be Derived
Seismic stratigrapic framework of pockmark field
Summary
From July 24-31, 2009 the USGS Woods Hole Science Centers Sea Floor Mapping 
Group, aboard the R/V RAFAEL, collected 66 lines (totaling 192 km) of seismic 
reflection profile data in the Belfast Bay, ME pockmark field.
Personnel included Emile Bergeron, William Danforth, Barry Irwin, and USGS
volunteer and Principal Investigator Laura Brothers.  Lines were collected
with an east-west orientation every 200 m over 29 km2.  Tie lines were
collected perpendicular to the survey lines.  In the northwest quadrant of the
survey area, tie lines were collected at 200 m spacing to further resolve the
geometry of seismic reflectors of interest (i.e. a proposed methane sourcebed,
and paleo pockmarks).  Seismic reflection profile data were collected using an
EdgeTech FSSB 424 seismic profiling system operating at frequencies of 4-24 kHz. 
 The data were acquired in EdgeTech Discover program, and saved in EdgeTech's 
JSF format.
The data were then converted to SEG-Y format using custom USGS software.
Data were processed in SioSeis, SeismicUnix, and will later be interpreted in
Landmark Graphics software. Our objective was to gather seismic data where we
had already acquired swath bathymetry data, but did not have corresponding
subsurface data.  In this latest initiative we identified seismic reflectors
observed in other previously surveyed portions of the field. We found that
recently mapped surficial flute-like features located in the southern portion
of the field are structurally controlled by irregular bedrock.  We observed
the southern terminus of a proposed organic layer, potentially representing a
sea-level lowstand, and identified potential coring sites.
Also, subsurface data suggest that paleo pockmarks or failure features may
exist at the Holocene/Pleistocene unconformity in the periphery of the main
channel.  This is the first time any such features have been observed and the
geometry of the reflectors must be further examined to confirm the validity of
this interpretation. With survey 09037 we completed a multiyear project that
characterizes the spatial, morphological, and subsurface variability of the 
field.
Notes
Platform Owner:
USGS-Woods Hole, MA
Platform Captain:
Barry Irwin
Sponsoring Office:
Woods Hole Coastal and Marine Science Center
Affiliate Principal and Organization (if any):
Laura Brothers, University of Maine
Number of days at sea:
7
 Major Center Equipment Required:
Navigation - DGPS, Navigation - HYPACK, EdgeTech 424 chirp
Navigation Methods:
dgps;
Data Types:
Location/Navigation, Notes/Logs, Seismic,
Degree of Certainty:
Certain
Continuous Data (in km):
192
Number of Stations Occupied:
0
Number of Submersible Dives:
0
Science Strategy:
Hazards;Climate;
Submitted By:
Walter Barnhardt
Report Date:
2010-12-02
Project Number
2921-AWW80
Funding
USGS
Got Help? For 2009-037-FA, we would appreciate any information on -- analog materials, contract, days at sea, dive count, equipment used, kms of navigation, national plan, NGDC Info, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
Type Webpage KMZ Arc         Metadata         WHSC
Metadata data     txt  data  FAQ  xml data
Navigation data nav      
Times   050.times      

2009-037-FA location map of where navigation 

equipment operated

 
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