Cruise Information EW9908
Nankai Trough SW Japan

 

The western Nankai 3-D experiment was conducted in 1999 on the R/V Maurice Ewing Legs 7 (EW9907) and 8 (EW9908). This is a collaborative project between UTIG, University of Hawaii, University of California, Santa Cruz, University of Tokyo, Japanese Geological Survey and STA JAMSTEC. The project consists of 81 dip lines ( Line numbers 92 through 172) each 80 km long with a shot spacing of 50 m. The streamer was 240 channels, 6 km long. There are also a few lines outside of the region, lines Nan-1 (the first line shot and has no navigation), 19, 20, 40, 42, and 50. The goal of the study is to examine changes in physical properties along the thrust as it changes from aseismic to seismic expression. Understanding this transition from compaction and aseismic slip to brittle failure is a major unknown in understanding lithospheric consumption and earthquake dynamics.

Chief Scientists:

Nathan L. Bangs
Asahiko Taira

Principal Investigators:

Nathan L. Bangs (NSF 9730637)
Thomas H. Shipley (NSF 9730637)
J. Casey Moore (NSF 9802264)
Greg F. Moore (NSF 9802295)
Julia K. Morgan (NSF 9802295)
Asahiko Taira
Shin'ichi Kuramoto

Data Originating Institution:

Institute for Geophysics, University of Texas at Austin

Funding Agency:

National Science Foundation
Ocean Research Institute, University of Tokyo
Geological Survey of Japan

Access:

Limited access.

Data Types Acquired:

MCS

Data Classes at UTIG:

Field

Data Types at UTIG:

MCS

LDEO cruise page

seismic sections
map
program summary information
scientific references
seismic acquisition parameters
processing history
line start/end dates and times
available SEG-Y data - Processed
available SEG-Y data - Field
related documents

 

Select a cruise:

Program Summary Information

NGDC Number

Platform

Maurice Ewing

Platform Operator

Lamont-Doherty Earth Observatory

Beginning Date

1999-07-21

Ending Date

1999-08-18

Start Port

Kochi

End Port

Yokohama

Line Names

VARIOUS LINES FROM NK-019 TO NK-172

Location

Pacific Ocean

Navigation

ASCII file

Cruise Report

PDF

Links

 

Comments

 

Scientific References
Moore, G.F., Taira, A., Klaus, A., et al., 2001, Proceedings of the Ocean Drilling Program, initial reports, deformation and fluid flow processes in the Nankai Trough accretionary prism, covering Leg 190 of the cruises of the drilling vessel JOIDES Resolution, Sydney, Australia, to Yokoha, Proceedings of the Ocean Drilling Program, Part A: Initial Reports, edited by Cagle, L. J. and Sherar, K.R., published by Ocean Drilling Program (College Station, TX), vol. 190, DOI: 10.2973/odp.proc.ir.190.2001.
URL: http://www-odp.tamu.edu/publications/190_IR/190TOC.HTM

Bangs, N., Shipley, T., Gulick, S., Moore, G., Kuromoto, S., and Nakamura, Y., 2004, Evolution of the Nankai trough decollement from the trench into the seismogenic zone: Inferences from 3D seismic reflection imaging, Geology, vol. 32, p. 273-276.

Gulick, S., Bangs, N., Shipley, T., Nakamura, Y., Moore, G., andKuramoto, S., 2004, Three-dimensional architecture of the Nankai accretionary prism's imbricate thrust zone off Cape Muroto, Japan: Prism reconstruction via en echelon thurst propagation, Journal of Geophysical Research, vol. 109, p. B02105, DOI: 10.1029/2003JB002654.

Bangs, N., Shipley, T., Moore, G., Moore, C., Gulick, S., Kuramoto, S., Nakamura, Y., and Park, J.-O., 2005, The 3-D Architecture of the Nankai Trough Accretionary Wedge and the Development of the Seismogenic Zone, MARGINS Newsletter, vol. 14 (Spring 2005), p. 1-5, 28.

Pisani, P. ., Reshef, M., and Moore, G., 2005, Targeted 3-D prestack depth imaging at Legs 190-196 ODP drill sites (Nankai Trough, Japan), Geophysical Research Letters, vol. 32(20), p. L20309, DOI: 10.1029/2005GL024191.
URL: http://www.agu.org/journals/gl/gl0520/2005GL024191/2005GL024191.pdf

Bangs, N.L., Gulick, S. and Shipley, T.H., 2006, Seamount subduction erosion in the Nankai Trough and its potential impact on the seismogenic zone, Geology, vol. 34, p. 701-704, DOI: 10.1130/G22451.1.

Seismic Acquisition Parameters

Receiver Type

Source Type

Acquisition System Name

Acquisition System Type

Seismic Navigation System

Survey Datum

Source to Near Channel (meters)

Antenna to Source (meters)

Number of Channels Recorded

Number of Cables

Number of Channels Each Cable

Channel Length (meters)

Cable Length (meters)

Cable Spacing (meters)

Near Channel Number

Cable Receiver Depth (meters)

Cable Receiver Depth Recorded

Number Source Arrays

FlipFlop Shooting

Source Array Separation (meters)

Source Volume (cubic inches)

Source Pressure (bars)

Source Number

Source Depth (meters)

Processing System

Shot Control

Shot Interval

Sample Interval (microseconds)

Record Length (seconds)

Compass Birds

Tail Buoy Positioning

Recording Delay

Comments

General Processing Description
Shipboard pre-processing: The 3490-type field tapes with 2-ms sample interval were anti-alias filtered and resampled to 4 ms on board ship. The field reels were combined into individual SEGY files spanning an entire line. Numerous parts of lines were re-shot for a variety of reasons and given line name suffixes, A, B and C. Two-dimensional stacks and migrations were created on board as part of the quality control by the University of Hawaii. The basic data processing used Pardigm's Focus software. Conventional binning and initial post-stack time migrations were completed in 2001. Two processing reports are available, though both were written as internal documents to outline the processing efforts. The first discusses preliminary processing and several experiments with different binning parameters. The second explains the final binning used for the post stack migration and the background leading up to the pre-stack time migration. Both reports (ew9908.processing1.pdf and ew9908.processing2.pdf) are very large files.

Line start/end dates and times

Line

Start date

Start
hr:min:sec

End date

End
hr:min:sec

Start shot

End Shot

Start
field Reel

End
field reel

NK-019

1999-08-16

08:26:00

1999-08-16

10:00:08

2

294

 

 

NK-020

1999-08-16

07:07:10

1999-08-16

08:25:26

2

248

 

 

NK-034

1999-08-07

09:32:20

1999-08-07

12:49:21

1

302

 

 

NK-092

1999-08-15

01:54:47

1999-08-15

10:28:35

1801

137

 

 

NK-093

1999-08-14

02:33:06

1999-08-14

11:24:20

1801

138

 

 

NK-094

1999-08-13

04:43:35

1999-08-13

14:04:46

1801

137

 

 

NK-095

1999-08-11

15:39:28

1999-08-12

00:07:17

1801

134

 

 

NK-097

1999-07-28

06:55:39

1999-07-28

16:22:26

1801

131

 

 

NK-097A

1999-08-10

10:21:00

1999-08-10

14:29:47

1801

994

 

 

NK-099

1999-07-29

04:43:07

1999-07-29

13:32:20

1801

140

 

 

NK-105

1999-07-30

01:40:27

1999-07-30

11:13:01

1801

1

 

 

NK-108A

1999-08-01

11:57:51

1999-08-01

13:01:04

300

110

 

 

NK-109

1999-07-31

00:41:43

1999-07-31

10:15:18

1801

1

 

 

NK-111A

1999-08-09

18:40:05

1999-08-09

19:55:51

1330

1089

 

 

NK-113

1999-07-31

23:20:18

1999-08-01

07:54:59

1801

201

 

 

NK-113B

1999-08-08

00:31:33

1999-08-08

03:20:07

1600

1093

 

 

NK-117

1999-08-02

01:28:51

1999-08-02

10:23:21

1801

201

 

 

NK-117A

1999-08-08

20:15:39

1999-08-09

04:51:33

1801

201

 

 

NK-117B

1999-08-10

23:33:31

1999-08-11

00:31:55

1099

918

 

 

NK-119A

1999-08-10

21:23:10

1999-08-10

22:05:13

1508

1376

 

 

NK-121

1999-08-02

23:37:35

1999-08-03

08:43:28

1801

201

 

 

NK-121A

1999-08-15

22:42:37

1999-08-16

07:06:52

1801

201

 

 

NK-122A

1999-08-09

21:27:44

1999-08-09

23:43:18

785

344

 

 

NK-123

1999-08-03

20:56:26

1999-08-04

05:50:38

1801

201

 

 

NK-123A

1999-08-11

01:27:36

1999-08-11

01:58:38

746

649

 

 

NK-125

1999-07-25

05:20:26

1999-07-25

14:03:32

1801

201

 

 

NK-126B

1999-08-08

06:01:56

1999-08-08

08:11:55

600

201

 

 

NK-129

1999-07-23

09:58:18

1999-07-23

18:50:42

1801

201

 

 

NK-131

1999-07-22

12:19:07

1999-07-22

20:21:23

1801

201

 

 

NK-134B

1999-08-04

09:43:46

1999-08-04

16:08:03

720

1801

 

 

NK-135

1999-07-27

18:18:20

1999-07-28

04:56:46

201

1801

 

 

NK-135A

1999-08-01

09:43:58

1999-08-01

10:10:09

201

283

 

 

NK-135B

1999-08-07

12:54:47

1999-08-07

17:43:08

201

1010

 

 

NK-138A

1999-08-04

07:50:17

1999-08-04

09:15:42

402

656

 

 

NK-139

1999-07-28

17:22:56

1999-07-29

02:58:25

201

1801

 

 

NK-141C

1999-08-03

12:07:41

1999-08-03

16:12:51

602

1352

 

 

NK-142A

1999-08-11

05:33:46

1999-08-11

06:19:37

1051

1180

 

 

NK-143A

1999-08-10

02:13:13

1999-08-10

08:42:22

650

1801

 

 

NK-145

1999-07-29

14:34:45

1999-07-30

00:06:04

201

1801

 

 

NK-149

1999-07-30

12:57:28

1999-07-30

22:29:21

201

1801

 

 

NK-151B

1999-08-11

09:04:40

1999-08-11

10:06:16

1088

1258

 

 

NK-153

1999-07-31

11:54:30

1999-07-31

21:08:41

203

1801

 

 

NK-154A

1999-08-07

20:35:32

1999-08-07

22:44:45

1474

1801

 

 

NK-156A

1999-08-07

18:48:39

1999-08-07

20:06:46

1189

1401

 

 

NK-157

1999-08-01

14:14:22

1999-08-01

23:52:54

201

1801

 

 

NK-157A

1999-08-15

11:58:39

1999-08-15

21:20:55

201

1801

 

 

NK-160A

1999-08-08

09:35:39

1999-08-08

18:31:34

350

1801

 

 

NK-161

1999-08-02

12:13:47

1999-08-02

21:54:10

201

1801

 

 

NK-161A

1999-08-09

06:31:11

1999-08-09

15:25:50

201

1801

 

 

NK-165

1999-07-25

15:22:56

1999-07-26

00:20:12

201

1612

 

 

NK-165A

1999-08-03

17:31:51

1999-08-03

18:57:17

1567

1801

 

 

NK-166

1999-07-24

16:44:44

1999-07-25

02:59:50

201

1801

 

 

NK-167

1999-07-23

20:11:27

1999-07-24

05:58:26

201

1801

 

 

NK-167A

1999-08-03

10:05:17

1999-08-03

11:00:45

232

403

 

 

NK-168

1999-07-22

22:21:01

1999-07-23

08:23:43

201

1801

 

 

NK-169

1999-07-22

01:11:13

1999-07-22

10:48:25

201

1801

 

 

NK-169A

1999-08-11

11:01:37

1999-08-11

13:36:29

1401

1801

 

 

NK-170

1999-08-12

01:41:16

1999-08-12

07:16:29

201

1167

 

 

NK-170A

1999-08-12

17:35:48

1999-08-13

02:46:50

409

1801

 

 

NK-171

1999-08-13

15:33:24

1999-08-14

00:53:53

201

1801

 

 

NK-172

1999-08-14

13:06:25

1999-08-15

00:01:28

201

1801

 

 

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Related Documents
ew9907_08.processing1.pdf
ew9907_08.processing2.pdf

The University of Texas at Austin Institute for Geophysics
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