This geophysical field program surveyed the southern Chile margin where a mid-ocean spreading ridge (Chile Ridge) is being subducted along the Chile Trench (Chile Triple Junction). It was funded by ENAP (lines 727-732) and NSF (lines 733-781). The principal scientific objectives of this survey were 1) to test models for the tectonic effects of ridge crest subduction, and 2) study subduction processes under the extremal conditions of a ridge-trench collision. Specific objectives involved comparing the deep structure, surficial morphology, and tectonic fabric of the inner-trench wall in zones corresponding to conditions before, during and after ridge-trench collision.

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 (LDEO)
related documents

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Program Summary Information

NGDC Number	01010288
Platform	Robert D. Conrad
Platform Operator	Lamont-Doherty Earth Observatory
Beginning Date	1988-01-07
Ending Date	1988-02-10
Start Port	Valparaiso, Chile
End Port	Punta Arenas, Chile
Line Names	MCS: 728-734, 736-781
Location	South Pacific Ocean
Navigation	LDEO field data
Cruise Report	PDF
Links
Comments

Scientific References
Cande, S. C. and Lewis, S. D., 1988, Investigating the subduction of a spreading center off southern Chile, Yearbook - Lamont-Doherty Geological Observatory of Columbia University, published by Lamont-Doherty Geological Observatory and the Department of the Geological Sciences of Columbia University, p. 18-25.

Bangs, N.L.B., SCande, S. C. Lewis, S. D., and J. J. Miller, J. J., 1992, Structural framework of the Chile margin at the Chile Ridge collision zone, Proceedings Ocean Drilling Program Init. Repts., edited by Behrmann, J.H., Lewis, S. D., Musgrave, R.J. et al.,, published by Ocean Drilling Program, College Station, Texas, vol. 141, p. 37580.

Bangs, N.L.B., Sawyer, D. S.and X. Golovchenko, X., 1993, Free gas at the base of the gas hydrate zone in the vicinity of the Chile Triple Junction, Geology, vol. 21, p. 905-908.

Lewis, S. D, Behrmann, J. H., Cande, S. C., and Musgrave, R J., 1994, Tectonics of the Chile margin triple junction from geophysical and scientific ocean drilling studies, 7th Chilean geologic congress: Abstracts, edited by Campos, E. and Cecione, A., vol. 7(1), p. 86-90.

Bangs, N. L. and Cande, S. C., 1997, Episodic development of a convergent margin inferred from structures and processes along the Southern Chile margin, Tectonics, vol. 16, p. 489-503.

Seismic Acquisition Parameters

Receiver Type	Hydrophone:Streamer
Source Type	AirGun:Bolt1500C
Acquisition System Name	DSS 240
Acquisition System Type	Digital
Seismic Navigation System	US Navy Transit Satellite
Survey Datum	WGS84
Source to Near Channel (meters)	240: 345, 320, 308, 292; 236: 320, 285
Antenna to Source (meters)	58
Number of Channels Recorded	236: line(s) 740-781; 240: line(s) 727; 728; 729-739
Number of Cables
Number of Channels Each Cable
Channel Length (meters)	12.5
Cable Length (meters)
Cable Spacing (meters)
Near Channel Number
Cable Receiver Depth (meters)	unknown
Cable Receiver Depth Recorded
Number Source Arrays
FlipFlop Shooting
Source Array Separation (meters)
Source Volume (cubic inches)	3768: line(s) 729-739; 740-781; 4991: line(s) 727; 728
Source Pressure (bars)	138
Source Number	10
Source Depth (meters)	unknown
Processing System	LDEO MCS Inhouse
Shot Control	time
Shot Interval (seconds)	18: line(s) 729-739; 740-781; 27: line(s) 727; 728
Sample Interval (microseconds)	4000
Record Length (seconds)	12
Compass Birds	no
Tail Buoy Positioning	no
Recording Delay	no
Comments

General Processing Description
Bandpass filter, noise filter, velocity filter, normal moveout, some with mute, and stack.

Line start/end dates and times
Not applicable or not available.

Related Documents
RC2901.LDEO.README