Seismic:Navigation
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Processed multichannel seismic data collected off Taiwan, acquired during the R/V Maurice Ewing survey EW9509 (1995)
This cooperative project was supported by scientists at four U.S. institutions and the Institute of Oceanography of the National Taiwan University. The project used the R/V Maurice Ewing to shoot and collect seismic reflection data and the R/V Ocean Researcher I (ORI429) to shoot and collect six deep refaction lines. The purpose was to obtain detailed new information with which to examine Taiwan crustal structure and the collision process. Funded by NSF grants OCE94-16583, OCE94-17415, OCE94-17411, OCE94-17414, OCE95-13945.
Schnurle, Phillippe
Investigator
Quality
2
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).
Data Files
References
Acquisition Information
Documents
Related Data Sets
ISO/XML Metadata
References
Sibuet et al., 2002 East Asia plate tectonics since 15 Ma: Constraints from the Taiwan region Tectonophysics 344(1-2). doi: 10.1016/S0040-1951(01)00202-5
Schnurle et al., 1998 Structural controls of the Taitung Canyon in the Huatung Basin East of Taiwan TAO 9(3).
Liu et al., 1997 TAICRUST and deep seismic imaging of western end of Ryukyu arc-trench system JAMSTEC J. Deep Sea Res. .
Yang and Wang, 1998 Crustal velocity variation of the Western Philippine Sea Plate from TAICRUST OBS/MCS Line 23 TAO 9(3).
Chi et al.,1998 Distribution of the bottom-simulating reflector in the offshore Taiwan collision zone TAO 9(4).
McIntosh et al, 2005 Crustal-Scale Seismic Profiles across Taiwan and the western Philippine Sea Tectonophysics 401. doi: 10.1016/j.tecto.2005.02.015
Schnurle et al., 2004 Characteristics of gas hydrate and free gas offshore southwestern Taiwan from a combined MCS/OBS data analysis Mar Geophys Res 25(1-2). doi: 10.1007/s11001-005-0740-6
Schnurle et al., 1998 Structural insight in the south Ryukyu margin: Effects of the subducting Gagua Ridge Tectonophysics 288. doi: 10.1016/S0040-1951(97)00298-9
Download Data Set Metadata Report
XML
MGDS formatted data set xml report containing verbose file and data set level metadata
ISO XML
ISO 19115-compliant xml report containing general data set level metadata
Related Acquisition Information
Seismic Acquisition Parameters
Download as Text: EW9509
EW9509_ACQ001 (Lines: Lines 01,03,23-35)
Source Information
AirGun (BOLT:1500C)
Source Number: 20
Volume (cu in): 8425
Pressure (psi): 2000
Shot Interval (sec): 20
Number of Arrays: 1
Receiver Information
Hydrophone:Streamer
Number of Cables: 1
Channels Per Cable: 160
Channels Recorded: 160
Group Spacing (m): 25
Cable Length (m): 4000
Near Channel Number: 160
Nav System
GPS
WGS84
Acquisition System
Digital
Name: DMS2000
Sample Interval (msec): 2
Record Length (sec): 16.384
Details
Shot Sequence and time in headers do not match up with the shot/time entries in the ts.n files
Dates/times are zero for lines 01 (all), 03, 19, 19a, 23, 24, 29
LDEO has no additional information that would allow matching navigation with shots
LDEO has no information about source-receiver offset
There are no msecs in the headers. It is possible that the time is from the original SEGD general header which may differ from the true time
For some lines shot number is reset to 1 in the middle of the line
Lines 01, 03, 19, 19a, 21-24 were flagged as IBM Floating Point
Lines 20b, 25-49 were flagged as IEEE Floating Point
Line 28b contained only a partial trace after shot 138, trace 40. It is assumed to be incomplete.
EW9509_ACQ002 (Lines: Lines 19-22)
Source Information
AirGun (BOLT:1500C)
Source Number: 20
Volume (cu in): 8425
Pressure (psi): 2000
Shot Interval (sec): 20
Number of Arrays: 1
Receiver Information
Hydrophone:Streamer
Number of Cables: 1
Channels Per Cable: 156
Channels Recorded: 156
Group Spacing (m): 25
Cable Length (m): 4000
Near Channel Number: 156
Nav System
GPS
WGS84
Acquisition System
Digital
Name: DMS2000
Sample Interval (msec): 2
Record Length (sec): 16.384
Details
See ACQ_001
EW9509_ACQ003 (Lines: Lines 45-48)
Source Information
AirGun (BOLT:1500C)
Source Number: 20
Volume (cu in): 8425
Pressure (psi): 2000
Shot Interval (sec): 20
Number of Arrays: 1
Receiver Information
Hydrophone:Streamer
Number of Cables: 1
Channels Per Cable: 144
Channels Recorded: 144
Group Spacing (m): 25
Cable Length (m): 4000
Near Channel Number: 144
Nav System
GPS
WGS84
Acquisition System
Digital
Name: DMS2000
Sample Interval (msec): 2
Record Length (sec): 16.384
Details
See ACQ_001
EW9509_ACQ004 (Lines: Line 49 only)
Source Information
AirGun (BOLT:1500C)
Source Number: 20
Volume (cu in): 8425
Pressure (psi): 2000
Shot Interval (sec): 20
Number of Arrays: 1
Receiver Information
Hydrophone:Streamer
Number of Cables: 1
Channels Per Cable: 128
Channels Recorded: 128
Group Spacing (m): 25
Near Channel Number: 128
Nav System
GPS
WGS84
Acquisition System
Digital
Name: DMS2000
Sample Interval (msec): 2
Record Length (sec): 16.384
Details
See ACQ_001
EW9509_ACQ005 (Lines: Lines 2,4-18,36-44)
Source Information
AirGun (BOLT:1500C)
Source Number: 20
Volume (cu in): 8425
Pressure (psi): 2000
Shot Interval (sec): 20
Number of Arrays: 1
Receiver Information
Hydrophone:Streamer
Number of Cables: 1
Group Spacing (m): 25
Nav System
GPS
WGS84
Acquisition System
Digital
Name: DMS2000
Sample Interval (msec): 2
Record Length (sec): 16.384
Details
See ACQ_001
edu.utexas.ig:ew9509_acq001 (Lines: )
Source Information
AirGun
Receiver Information
Hydrophone:Streamer
Used Active Tail Buoy: false
Used Compass Birds: false
Nav System
differential GPS using data received simultaneously onboard the R/V <i>Ewing</i> and at a base station at the National Taiwan University
WGS84
Acquisition System
Digital
Name: Reftek recorders<br>Kinematrics K2 recorders
Details
Receiver Type: Hydrophone_Streamer
Source Type: SeismicSource_Gun_Air
Acquisition System Name: Reftek recorders<br>Kinematrics K2 recorders
Acquisition System Type: digital
Seismic Nav System: differential GPS using data received simultaneously onboard the R/V <i>Ewing</i> and at a base station at the National Taiwan University
Survey Datum: WGS84
Source to Near Channel (m): null
Antenna to Source (m): null
Number of Channels Recorded: 160
Channel Length (m): 25
Cable Receiver Depth (m): null
Source Volume (cubicInches): 8425
Source Pressure (bars): null
Source Number: 20
Source Depth (m): null
Shot Control: time
Shot Interval (s or m): 20
Compass Birds: no
Tail Buoy Positioning: no
Recording Delay: no
Data Set Documents
ew9509.shootingLog.pdf (188.0kB)
PDF
Weekly
ew9509.weeklyCruiseReports.pdf (2.6MB)
PDF
EW9509 Documents
Seismic:AcquisitionParametersDetails
EW9509.seismic.metadata.txt (1.0kB)
ASCII
Related Data Sets
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Seismic:Reflection:MCS
Data DOI:
10.1594/IEDA/500138
Processed multichannel seismic data collected off Taiwan, acquired during the R/V Maurice Ewing survey EW9509 (1995)
Locale
File Format
SEGY
Quality
2
Schnurle, Phillippe
Processed multichannel seismic data collected off Taiwan, acquired during the R/V Maurice Ewing survey EW9509 (1995)
Locale
File Format
PDF
Quality
2
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