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General Information

Data Type

Singlechannel Seismic

Data Acquisition System

Sparker and Streamer

Contributor

Pacific Coastal and Marine Science Center

Dates

Started on July 6, 2009, and ended on July 10, 2009.

Number of Tracklines

26

Distance Shot

235 km

Description

Minisparker seismic-reflection data of field activity S-5-09-SC: San Pedro Basin, offshore southern California from 2009-07-06 to 2009-07-10

Purpose

This dataset includes raw and processed, high-resolution seismic-reflection data collected in 2009 to explore a possible connection between the San Diego Trough Fault and the San Pedro Basin Fault. The survey is in the San Pedro Basin between Santa Catalina Island and San Pedro, California. The data were collected aboard the U.S. Geological Survey R/V Parke Snavely. The seismic-reflection data were acquired using a SIG 2mille minisparker. Subbottom acoustic penetration spanned tens to several hundreds of meters, variable by location.

Notes

Citation: Sliter, R.W., Conrad, J.E., Ryan, H.F., and Triezenberg, P.J., 2017, Minisparker seismic-reflection data of field activity S-5-09-SC: San Pedro Basin, offshore southern California from 2009-07-06 to 2009-07-10: U.S. Geological Survey data release, doi:10.5066/F7F769QG

Geographic Features

Southern California

Dataset Information

Processed Methods

Seismic Reflection

Processed Data Classes

Other

Data File Formats

SEG-Y

Embedded Navigation

Yes

Data Class

Compilation

Seismic Data Provenances

Digitally Acquired Digital SEG

Data Media

Online

Processing

Seismic-reflection data were collected using a minisparker system that creates an acoustic signal by discharging a 500-Joule, high-voltage electrical pulse between electrodes and a ground that generates a frequency spectrum roughly between 200 and 1,600 Hz. At boat speeds of 4 to 4.5 nm/hour, seismic traces were collected roughly every 1 to 2 meters. The data were recorded on a 15-m-long hydrophone streamer in standard SEG-Y 32-bit floating point format with Triton Subbottom Logger (SBL) software that merges seismic-reflection data with differential GPS navigation data.

Seismic-reflection SEG-Y files were corrected for swell effects using Sioseis software: 1) SEG-Y header cdp numbers were defined using the "header" Sioseis processes, and a band pass filter was applied; 2) Water-bottom time/shot-point pairs where created and added to the headers to guide the automated water-bottom picker and used to mute the water column; 3) A swell filter was applied to the data; 4) A 120 to 800 Hz bandpass filter, mute and agc were applied, and the results were exported as a processed SEG-Y file.

Navigation Information

Datum

World Geodetic System 1984 (WGS84)

Location

Tracklines 26 total

Name Length (km) First SP Last SP First CDP Last CDP
SP-01 1 1 332 -- --
SP-01A 10 1 3,811 -- --
SP-01B 12 1 3,103 -- --
SP-02 3 1 660 -- --
SP-09 16 1 3,590 -- --
SP-10 18 1 3,921 -- --
SP-11 12 1 2,886 -- --
SP-12 8 1 1,792 -- --
SP-13 13 1 3,500 -- --
SP-14 5 1 1,276 -- --
SP-14A 2 1 594 -- --
SP-14B 4 1 956 -- --
SP-15 10 1 2,929 -- --
SP-16 10 1 2,678 -- --
SP-17 6 1 1,704 -- --
SP-18 7 1 1,722 -- --
SP-19 3 1 726 -- --
SP-19A 13 1 3,164 -- --
SP-20 15 1 3,416 -- --
SP-21 14 1 3,050 -- --
SP-22 7 1 1,608 -- --
SP-23 10 1 2,126 -- --
SP-24 13 1 3,113 -- --
SP-25 11 1 2,606 -- --
SP-26 1 1 136 -- --
SP-26A 13 1 2,969 -- --