This CD-ROM contains digital
high resolution seismic-
reflection data collected
during the USGS GYRE 97006
cruise. The coverage is the
offshore Louisana continental
slope, Gulf of Mexico. The
seismic-reflection data are
stored as IBM 4 bit interger
SEG-Y format that can be read and
manipulated by most seismic-
processing software. Much
of the information specific
to the data are contained
in the headers of the SEG-Y
format files. The file system
format is ISO 9660 which can
be read with DOS, Unix, and
MAC operating systems with
the appropriate CD-ROM driver
software installed. This
directory contains the GI air
gun data collected on the
GYRE 97006 cruise. These data
were collected using a
Seismic Systems Inc. generated
injected (GI) air gun
source. On this cruise the GI gun
was configured with two 105
cu. in. chambers, a total
of 210 cu. in. The GI gun
works by using one chamber
for a primary pulse and the
second chamber injects a
pulse near the maximum
expansion of the primary pulse.
This results in a dampening
effect on the collapse of
the primary bubble pulse.
The data were logged on an
Intel based PC computer
(Mudseis system). The data are
two-channel (two traces per
shot).
Purpose:
The seismic-reflection data
are being archived so that
further digital processing
can be done for the seafloor
mapping project: TECTONICS
AND SEDIMENTARY PROCESSES OF
THE SALT DEFORMED TEXAS-
LOUISIANA CONTINENTAL SLOPE.
This project proposes (1)
mapping the surficial geology
of a large part of the TX-LA
slope using advanced
processing techniques and
existing GLORIA and multibeam
data, (2) conducting a
higher resolution sidescan and
sampling cruise to refine
the understanding of tectonic,
sediment supply, and
oceanographic controls on
sedimentary processes, (3)
linking the surficial geology
with the subsurface
structures and stratigraphy for
modern and ancient
comparison of sedimentary systems,
and (4) integrating data
into a three-dimensional model
of depositional systems in
this complex environment.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19970409
Beginning_Time: 045227
Ending_Date: 19970413
Ending_Time: 131459
Currentness_Reference: publication date
Status:
Progress: In work
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:
-
92.833333
East_Bounding_Coordinate:
-
91.916667
North_Bounding_Coordinate: 27.5
South_Bounding_Coordinate: 26.25
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword:
seismic
reflection
Theme_Keyword:
Seismic
Systems Inc.
Theme_Keyword: GI Air Gun
Theme_Keyword: SEG-Y
Theme_Keyword:
ISO 9660 CD-
ROM
Place:
Place_Keyword_Thesaurus: None
Place_Keyword:
Gulf of
Mexico
Place_Keyword: Louisiana
Place_Keyword: LA
Place_Keyword:
continental
slope
Place_Keyword: R/V GYRE
Access_Constraints:
for U.S. Geological Survey use
only
Use_Constraints: for U.S. Geological Survey use only
D. Twichell, D. Nichols, T. O'Brien, B.
Irwin, V. Cross, M. Taylor
D. Foster, B. Danforth, S. Harrison, J.
Brand, C. Spagnuolo
Native_Data_Set_Environment: ISO 9660
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:
Attribute_Accuracy_Explanation:
Logical_Consistency_Report:
Completeness_Report:
archive of SEG-Y format seismic
data
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The ship was
navigated with differential GPS
The GI air gun
was towed 10 m aft of the ship
The two-channel
streamer was towed 100 m aft of the
ship. Each
channel consisted of a 25 m length
of streamer.
The air gun was
towed at depth of 1 meter. The
streamer was
towed at a depth of 5 meters. Vertical
resolution of
the seismic data is about 1-2 meters.
There was no
correction to a datum such as mean sea
level.
U.S. Geological Suvey Internal
CD-ROM Data Archive
Distribution_Liability:
This Compact Disc-Read Only Memory (CD-
ROM) publication
was prepared by an agency of the United
States Government.
Neither the United States Government nor
any agency thereof,
nor any of their employees, make any
warranty, expressed
or implied, or assumes any legal
liability or responsibility
information, apparatus, product, or
process disclosed in
this report, or represents that its use
would not infringe
privately owned rights. Reference
therein to any specific
commercial product, process, or service
by trade name,
trademark, manufacturer, or otherwise
does not necessarily
constitute or imply its endorsement,
recommendation, or
favoring by the United States Government
or any agency thereof.
Any views and opinions of authors
expressed herein do not
necessarily state or reflect those of
the United States
Government or any agency thereof.
Although all data published
on this CD-ROM have been used by the
USGS, no warranty,
expressed or implied, is made by the
USGS as to the accuracy
of the data and related materials and/or
the functioning of
the software. The act of distribution
shall not constitute
any such warranty, and no responsibility
is assumed by the
USGS in the use of this data, software,
or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:
ISO
9660 CD-ROM
Format_Version_Number: ISO 9660
Format_Specification:
Format_Information_Content: SEG-Y
File_Decompression_Technique: none
Transfer_Size: 650 MB
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 512
Recording_Density_Units: bytes
Recording_Format: ISO 9660
Compatibility_Information: UNIX, DOS, MAC
Fees:
Metadata_Reference_Information:
Metadata_Date: 19970408
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Nealon, Jeffrey W.
Contact_Organization: U.S. Geological Survey
Contact_Position:
Geophysics
Group
Contact_Address:
Address_Type: mailing address
Address:
U.S.
Geological Survey
Woods Hole Field Center
384
Woods Hole Road
Quissett Campus
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: jnealon@usgs.gov
Metadata_Standard_Name: FGDC Content Standard
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: universal time
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
Generated by mp version 2.4.10 on Mon Nov 22 09:18:58 1999