National Geophysical Data Center
MULTICHANNEL SEISMIC-REFLECTION DATA
Solomon Islands - South Pacific Ocean
USGS Open File Report 86-552*
Data Announcement 87-MGG-11
Approximately 3,500 km of 24-channel seismic-reflection profiles
in the Solomon Islands region of the South Pacific are now
available for purchase from the National Geophysical Data Center
(NGDC). These data were collected in May and early June 1982 by
the U.S. Geological Survey (USGS) Research Vessel S.P. LEE during
Cruise L782SP. The profiles were collected as part of the
Australia-New Zealand-United States Tripartite Agreement of 1982
in cooperation with the Ministry of Lands, Survey, and Natural
Resources of the Solomon Islands. The USGS, Department of
Interior has provided these data to NGDC for public
The seismic energy source consisted of a tuned array of five
airguns with a total volume of 1,313 cu. in. of air compressed to
approximately 1,900 psi. The recording system consisted of a 24-
channel, 2400-m long streamer with a group interval of 100 m, and
a GUS (Global Universal Science) model 4200 digital recording
instrument. Shots were fired every 50 m with 100-m group
Navigational control for the survey was provided by a Magnavox-
integrated navigation system using transit satellites and Doppler
sonar. A 2-msec sampling rate was used in the field and the data
were later desampled to 4 msec during the demultiplexing process.
A 10-sec data length was recorded, which, combined with a deep-
water delay, yielded up to 16 sec of two-way travel time. The
sequence of processing of data was editing-demultiplexing,
velocity analysis, CDP stacking, deconvolution-filtering, and
plotting on an electrostatic plotter. The seismic lines are
available on plastic, paper sepia, paper blackline, or on
* "Multichannel Seismic-Reflection Data Collected in 1982 in the
Solomon Islands Region of the South Pacific," by John G. Veddar,
Dennis M. Mann, Terry R. Bruns, and Ray W. Silter, USGS Open File
Report 86-552, U.S. Geological Survey, Menlo Park, CA 94025.
1. Common-Depth-Point Seismic Data
24-fold multichannel seismic data for 52 lines/59 sections in
plastic sepia, paper sepia, or blackline.
1 Navigation Chart in plastic sepia, paper sepia, or
1 Shot-point navigation magnetic tape (9-track, 1600 bpi,
ASCII). This is also available on CD-ROM.
2. CDP Stack Tapes
52 Digital magnetic stacked tapes derived from velocity
analysis (not deconvolved or bandpass filtered. Copies of
tapes and description of tape format available.
52 Digital magnetic demultiplexed stacked tapes.
Please contact NGDC for prices.