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FGDC Formal Seismic Metadata
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Identification_Information:
Citation:
Citation_Information:
Originator: Karynna Calderon
Originator: Shawn V. Dadisman
Originator: Jack L. Kindinger
Originator: Dana S. Wiese
Originator: James G. Flocks
Publication_Date: 2002
Title: Archive of Boomer Seismic Reflection Data
Collected on USGS Field Activities 01ASR01, 01ASR02,
02ASR01, and 02ASR02,
Miami, Florida, November 2001 - January
Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 02-408
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Description:
Abstract:
This appendix consists of two-dimensional marine seismic reflection profile
data collected in canals in the Lake Belt Area of Miami, Florida. These
data were acquired in November and December of 2001 and January and
February of
a variety of
images. Binary
SEG-Y format and
SEG-Y data files
distributed onto two
images of the profiles
Purpose:
Marine seismic reflection data is used to image and map sedimentary and
structural features of the seafloor and subsurface. These data are useful
in mapping
characteristics and features. These data were collected
CMGP Aquifer Storage and Recovery and Leaky Coastal Margins
in
Supplemental_Information:
Seismic reflection profiles are acquired by means of an acoustic source
(usually generated electronically) and a hydrophone or hydrophone array.
Both elements are typically towed in the water behind a survey vessel.
The sound source emits a short acoustic pulse, which propagates through
the water and sediment columns. The acoustic energy is reflected at
density boundaries (such as the seafloor or sediment layers beneath the
seafloor) and detected at the hydrophone. This process is repeated at
intervals ranging between 100 milliseconds and 1 second depending on the
source type. In this way a two-dimensional image of the geologic structure
beneath the ship track is constructed.
Seismic data were stored in SEG-Y format, which is a standard digital
format that can be read and manipulated by most seismic-processing
software packages. The SEG-Y file format includes a 3200-byte descriptive
header that contains detailed information regarding the data acquisition
and processing parameters. All data
presented here is stored in SEG-Y,
Integer, Motorola format. The SEG-Y data files are too large to fit on one
CD-ROM, so they have been distributed onto two CD-ROMs, with the SEG-Y
data files for Field Activities 01ASR01 and 01ASR02 on Disc 1 and the
SEG-Y data files for Field Activities 02ASR01 and 02ASR02 on Disc 2.
SEG-Y formatted trace data files have a .TRA
recording parameters for each seismic data file can
.PAR file associated with each .TRA file. However,
UTM_401_1.pln file are only needed to replay the
Delph Seismic software.
For Field Activity 01ASR01, the seismic source employed consisted of a
boomer transducer towed on a sled at the sea surface providing 100 joules
per shot. The reflected energy was received by an SN Technologies NexGen
solid core streamer and recorded by
PC-based Triton-Elics Delph
Seismic acquisition software. The streamer contains 10 hydrophones evenly
spaced every 2 meters. Only data received by elements 7 and 8 were summed
for line 01b01 and for line 01b02 through shot number 2,819. Afterward,
only data received by elements 8 and 9 were summed. The streamer was
positioned parallel to the boomer sled and laterally separated from it by
approximately 3 meters. The sled was towed approximately 5 meters behind
the GPS antenna. The sample frequency of the data was 12 kilohertz, and
the total record length was 100 milliseconds. The fire rate was every 0.5
seconds, which resulted in a shot spacing of about 0.64 meters.
For Field Activity 01ASR02, the seismic source employed consisted of a
boomer transducer towed on a sled at the sea surface providing 280 joules
per shot. The reflected energy was received by an SN Technologies NexGen
solid core streamer and recorded by
PC-based Triton-Elics Delph Seismic
acquisition software. The streamer contains 10 hydrophones evenly spaced
every 2 meters. Only data received by elements 8 and 9 were summed for
line 01b01 through shot number 8,903. Afterward, data received by element
10 was also summed. The streamer was positioned parallel to the boomer
sled and laterally separated from it by approximately 3 meters. The sled
was towed approximately 5 meters behind the GPS antenna. The sample
frequency of the data was 24 kilohertz, and the total record length was
100 milliseconds. The fire rate was every 0.5 seconds, which resulted in a
shot spacing of about 0.64 meters.
For Field Activity 02ASR01, the seismic source employed consisted of a
boomer transducer towed on a sled at the sea surface providing 280 joules
per shot. The reflected energy was received by an SN Technologies NexGen
solid core streamer and recorded by
PC-based Triton-Elics Delph Seismic
acquisition software. The streamer contains 10 hydrophones evenly spaced
every 2 meters. Only data received by elements 8, 9, and 10 were summed
for line 02b01 and for line 02b02 through shot number 1,748. Only data
received by elements 5, 6, and 7 were summed for line 02b02 between shot
numbers 1,750 and 2,828. For the rest of line 02b02 and for all other
lines, only data received by elements 4, 5, and 6 were summed. The
streamer was positioned parallel to the boomer sled and laterally
separated from it by approximately 3 meters. The sled was towed
approximately 5 meters behind the GPS antenna. The sample frequency of the
data was 12 kilohertz for line 02b01 and 24 kilohertz for all other lines.
The total record length was 100 milliseconds. The fire rate was every 0.5
seconds, which resulted in a shot spacing that ranges between about 0.46
and 0.64 meters.
For Field Activity 02ASR02, the seismic source employed consisted of a
boomer transducer towed on a sled at the sea surface providing 280 joules
per shot. The reflected energy was received by an Innovative Transducer,
Inc. (ITI) solid core streamer and recorded by PC-
Seismic acquisition software. The streamer
spaced about every 0.6 meters (2 feet). However, only data
elements 3 and 4 were summed. The streamer was positioned
boomer sled and laterally separated from it by about 3.5
was towed approximately 5.5 meters behind the GPS antenna
number 8,230 of line 02b01, approximately 7.5 meters behind
for the rest of line 02b01, and about 6 meters behind the
02b02. The sample frequency of the data was 24 kilohertz
record length was 100 milliseconds. The fire rate was every
which resulted in a shot spacing that ranges between about
meters.
Differential GPS navigation was fed to the acquisition system every
second by a WAAS/Beacon DGPS receiver. The accuracy of this receiver is to
within 5 meters. However, the data required some editing. These edited
results were used to generate the trackline maps presented here. The
navigation data has not been corrected to reflect the offset between the
source and the GPS antenna. Position fixes for every 500 shots and for the
start of line are also provided as an aide for registering of the data
after plotting. All navigation files are
stored as flat ASCII text files.
The trackline maps provided in this archive are in geographic projection.
They were created using ESRI's GIS software ArcView 3.2, exported to Adobe
Illustrator for further editing, and
saved as GIF images. These GIF images
are viewable with your WWW browser.
Included on Disc 2 are the arc project and associated shapefiles used
to create the trackline maps presented here. The project was created with
ArcView 3.2 and is compatible with ArcView 3.x (UNIX or Windows)
and ArcGIS 8.1 (Windows). The shapefiles can be viewed using
the public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows,
UNIX, Linux), which can be downloaded
from the ESRI website at
http://www.esri.com/software/arcexplorer/.
Field Activity Collection System (FACS) logs are available in both html
and Rich Text format. Scanned GIF images
of the original FACS logbooks
are also provided.
Also included on these CD-ROMs are Seismic
Unix (SU) scripts that allow
the
a
format,
produced. These images can then be displayed using a variety of shareware
programs such as ImageMagick (UNIX or Linux) or a web browser.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20011114
Ending_Date: 20011115
Beginning_Date: 20011203
Ending_Date: 20011205
Beginning_Date: 20020103
Ending_Date: 20020105
Beginning_Date: 20020227
Ending_Date: 20020228
Currentness_Reference:
Data assumed to be constant over time but may change due to geologic
processes.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.633509
East_Bounding_Coordinate: -80.317357
North_Bounding_Coordinate: 26.146910
South_Bounding_Coordinate: 25.612488
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: marine seismic reflection
Theme_Keyword: boomer
Theme_Keyword: 01ASR01
Theme_Keyword: 01ASR02
Theme_Keyword: 02ASR01
Theme_Keyword: 02ASR02
Theme_Keyword: SEG-Y
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Miami
Place_Keyword: Florida
Place_Keyword: canals
Place_Keyword: Aquifer Storage and Recovery
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The U.S. Geological Survey requests to be acknowledged as the originator of
the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jack Kindinger
Contact_Organization: U.S. Geological Survey
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 803-8747 X3018
Contact_Electronic_Mail_Address: jkindinger@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
CD-ROM/MAPS/basemap.gif
Browse_Graphic_File_Description:
Trackline map of data collected for the
ASR project during USGS Field
Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02 in Miami, Florida
canals during November and December of 2001 and January and February of
2002. This map is in geographic
projection. It was created using ESRI's GIS
software ArcView 3.2, exported to Adobe Illustrator for further editing,
and saved for the web as a GIF image.
The USGS is not the originator of
all layers used in creating this basemap. For example, the coastline
layer was developed by ESRI, and the interstates layer was developed by
the Florida Economic and Demographic Research Division of the Joint
Management Committee.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name:
CD-ROM/MAPS/north.gif
Browse_Graphic_File_Description:
Trackline map of data collected in the northern region of the study
area (lines 01ASR01-01b01 - 01b05, 01ASR02-01b01 - 01b08, and
02ASR01-02b04) during USGS Field Activities 01ASR01, 01ASR02, and 02ASR01
in Miami, Florida canals during November and December of 2001 and
January of 2002. This map is in geographic projection. It was created
using ESRI's GIS software ArcView 3.2, exported to Adobe Illustrator for
further editing, and saved for the web
as a GIF image.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name:
CD-ROM/MAPS/south.gif
Browse_Graphic_File_Description:
Trackline map of data collected in the southern region of the study
area (lines 01ASR01-01b06 - 01b07, 01ASR02-01b09 - 01b11, 02ASR01-02b01 -
02b03 and 02b05 - 02b06, and
02ASR02-02b01) during USGS Field Activities
01ASR01, 01ASR02, 02ASR01, and 02ASR02 in Miami, Florida canals during
November and December of 2001 and January and February of 2002. This
map is in geographic projection. It was
created using ESRI's GIS software
ArcView 3.2, exported to Adobe Illustrator for further editing, and saved
for the web as a GIF image.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name:
CD-ROM/MAPS/tstline.gif
Browse_Graphic_File_Description:
Trackline map of line 02ASR02-02b02 data
collected during USGS Field
Activity 02ASR02 in Miami, Florida canals during February of 2002. This
test line was not part of the ASR project. This map is in geographic
projection. It was created using ESRI's
GIS software ArcView 3.2, exported
to Adobe Illustrator for further
editing, and saved for the web as a GIF image.
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
This work was funded by the South Florida Water Management District office
in Miami, Florida. We thank Chandra A.
Dreher of the USGS in
St. Petersburg, Florida, for her field support during data collection
Gina M. Peery of the USGS in
St. Petersburg, Florida, for her
with the web design layout for this archive, as well as for
examples of her formal metadata. We also thank reviewers Robert B. Halley
and Charles W. Holmes of the USGS in St. Petersburg, Florida, whose
comments improved this document.
Native_Data_Set_Environment:
SEG-Y
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of marine seismic reflection profiles
is highly qualitative and depends on equipment and operating
condition variables. Visual inspection of the images rendered
showed that some of the profiles contain an interference pattern of
unknown origin.
Logical_Consistency_Report: These data sets are from four field activites
with consistent instrument calibrations.
Completeness_Report:
These data are collected along tracklines (2D). Therefore, data are
inherently incomplete. Geologic details between lines must be inferred. All
tracklines were recorded to 100 milliseconds.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The position accuracy was determined
with a WAAS/Beacon DGPS receiver.
The accuracy of this receiver is
within 5 meters. The DGPS data was fed
to a navigation computer running HYPAK software which converted the
data to UTMs. The UTM string was then fed to the Delph Seismic
Acquisition software and recorded in
the SEG-Y headers for each trace.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Water level was regulated so that it was 1.524 meters (5 feet) above
sea level at
Lineage:
Process_Step:
Process_Description: Boomer processing
Raw SEG-Y data was processed with Seismic Unix to produce the
GIF-formatted seismic profiles included in this report.
A representative data processing sequence consisted of:
1)Bandpass filter: 300-500-2500-3000 Hz
2)Automatic gain control
3)Postscript display
4)Convert Postscripts to GIF format
Process_Date: 2002
Process_Step:
Process_Description: Positional (navigation) data
As the seismic reflection data were acquired, the position of the
vessel was continuously determined
with the DGPS. Positions were
recorded approximately every second and
written to the SEG-Y header.
The ASCII 500-shot interval navigation files were extracted from the
SEG-Y headers using Seismic Unix scripts.
Process_Date: 2002
Process_Step:
Process_Description: Editing navigation
The ASCII navigation files were extracted from the SEG-Y headers and
edited to remove spurious data points. The data was then processed
using PROJ.4 freeware to convert the
UTMs to latitude and longitude.
The data was also reformatted for use
with ESRI's GIS software
ArcView 3.2.
Process_Date: 2002
Process_Step:
Process_Description: Open-File preparation
No processing has been done to the
SEG-Y data files provided on these
CD-ROMs. The data were displayed as 8-bit gray scale Postscript files
using the Seismic Unix 'psimage' algorithm. The Postscript images were
then converted to GIF images with ImageMagick.
Process_Date: 2002
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Horizontal X and Y locations (both Zone 17
UTMs and latitude and longitude)
for each shot location are provided in
ASCII position files, along with the
time the shot was recorded in Greenwich Mean Time.
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0000088
Longitude_Resolution: 0.0000088
Geographic_Coordinate_Units: decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS 84
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137 m
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Binary data file:
Each profile is available as a binary file in Society of Exploration
Geophysicists (SEG) SEG-Y format. A
SEG-Y file consists of 1) a 3200-byte
file identification record of
ASCII-formatted general information, 2) a
400-byte binary record with information such as sample rate and record
length specific to the data set, and 3) multiple records, with one
seismic reflection trace per record. Each trace record is preceded by a
240-byte trace header containing information such as trace number and
acquisition day and time specific to each trace. The trace data are
represented as a time series of unitless 16-bit integer or 32-bit real
numbers proportional to the reflection
coefficient. The SEG-Y file is
useful only if you have access to specialized software designed to
process and display seismic reflection
data. These SEG-Y files have a
.TRA extension. These .TRA files range in size from
Entity_and_Attribute_Citation:
Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards
for digital tape formats: Geophysics, v. 40, n.2, p. 344-352. Also
available online at:
http://www.seg.org/publications/tech-stand/index_body.html.
Entity_and_Attribute_Overview:
Graphic image file:
Each profile is available as a GIF image. The trackline maps
provided are GIF images that contain hotlinks to the seismic profile
GIF images. The profiles range in size
from 467.2 KB to 5.5 MB.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Rob Wertz
Contact_Organization: U.S. Geological Survey
Contact_Position: Manager - Data Management Group
Contact_Address:
Address_Type: Mailing address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 803-8747 X3045
Contact_Electronic_Mail_Address: rwertz@usgs.gov
Contact_Instructions:
Data may be available on-line only by special arrangement with the
distributor above.
Resource_Description: U.S. Geological Survey Open-File Report 02-408 CD-ROM
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 for the accuracy, completeness, or usefulness of any
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 these CD-ROMs
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: SEG-Y, GIF, ASCII
Format_Information_Content:
The SEG-Y standard format (Barry et al., 1975) consists of the
following: a 3600-byte reel identification header with the first
3200 bytes consisting of an ASCII header block and a 400-byte binary
header block that both include information specific to line and reel
number, a trace data block that follows the reel identification
header with the first 240 bytes of each trace block consisting of the
binary trace identification header, and seismic data samples that
follow the trace identification header.
File_Decompression_Technique: none
Transfer_Size: Disc 1: 562.3 MB; Disc 2: 275 MB (2 CD-ROMs)
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Compatibility_Information: Unix, Linux, DOS, MAC
Fees: Available from the Denver Open-File Sales Department, prices vary.
Ordering_Instructions: Most open-file
reports are available from USGS
Information Services, Box 25286,
Federal Center, Denver, CO 80225
(telephone: 303-202-4210; email: infoservices@usgs.gov).
Technical_Prerequisites:
Use of SEG-Y data requires specialized seismic processing software, such as
UNIX or Linux based public domain software
Seismic Unix (SU) developed by the
Colorado School of Mines Center for Wave Phenomena, which can be downloaded
at http://www.cwp.mines.edu/cwpcodes.
Metadata_Reference_Information:
Metadata_Date: 20021017
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Karynna Calderon
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer - Data Management Group
Contact_Address:
Address_Type: Mailing address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 803-8747 X3143
Contact_Electronic_Mail_Address: kcalderon@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998