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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 June 8, 2011, and ended on June 22, 2011.

Number of Tracklines

62

Distance Shot

598 km

Description

Minisparker seismic-reflection data of field activity S-07-11-SC: offshore San Diego, and Los Angeles Counties, southern California from 2011-06-08 to 2011-06-22

Purpose

This dataset includes raw and processed, high-resolution seismic-reflection data collected in 2011 to collect information on active offshore faults. The survey area is offshore southern California between Long Beach and San Diego. 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 system. Subbottom acoustic penetration spanned tens to several hundreds of meters, variable by location and equipment type.

Notes

Citation: Sliter, R.W., Conrad, J.E., Ryan, H.F., and Triezenberg, P.J., 2017, Minisparker seismic-reflection data of field activity S-07-11-SC: offshore San Diego, and Los Angeles Counties, southern California from 2011-06-08 to 2011-06-22: U.S. Geological Survey data release, doi:10.5066/F7SF2TCV

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 swell correction; 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 62 total

Name Length (km) First SP Last SP First CDP Last CDP
OS-101 9 1 2,392 1 2,392
OS-102 6 1 2,733 1 2,733
OS-103 6 1 3,434 1 3,434
OS-104 22 1 5,863 1 5,863
OS-105 16 1 4,001 1 4,001
OS-106 10 1 2,845 1 2,845
OS-107 12 1 2,963 1 2,963
OS-108 13 1 3,468 1 3,468
OS-109 21 1 5,192 1 5,192
OS-110 30 1 3,415 1 3,415
OS-111 3 1 844 1 844
OS-111A 7 1 1,936 1 1,936
OS-112 5 1 1,262 1 1,262
OS-112A 15 1 4,022 1 4,022
OS-113 21 1 5,128 1 5,128
OS-114 7 1 1,659 1 1,659
OS-115 8 1 1,928 1 1,928
OS-116 6 1 1,465 1 1,465
OS-117 1 1 272 1 272
OS-117A 0 1 21 1 21
OS-117B 0 1 107 1 107
OS-118 4 1 1,189 1 1,189
OS-118A 5 1 1,402 1 1,402
OS-119 4 1 959 1 959
OS-119A 6 1 1,569 1 1,569
OS-120 9 1 2,344 1 2,344
OS-121 10 1 2,549 1 2,549
OS-122 9 1 2,527 1 2,527
OS-123 9 1 2,290 1 2,290
OS-124 8 1 1,898 1 1,898
OS-125 6 1 1,118 1 1,118
OS-125A 2 1 324 1 324
OS-126 9 1 1,932 1 1,932
OS-127 9 1 1,899 1 1,899
OS-128 14 1 2,909 1 2,909
OS-129 13 1 2,812 1 2,812
OS-130 10 1 1,805 1 1,805
OS-131 12 1 2,744 1 2,744
OS-131A 7 1 1,448 1 1,448
OS-132 4 1 1,367 1 1,367
OS-132A 18 1 5,975 1 5,975
OS-133 4 1 1,711 1 1,711
OS-134 12 1 2,873 1 2,873
OS-135 16 1 3,620 1 3,620
OS-136 8 1 1,955 1 1,955
OS-136A 2 1 452 1 452
OS-137 8 1 2,121 1 2,121
OS-138 15 1 4,240 1 4,240
OS-139 17 1 4,328 1 4,328
OS-140 11 1 2,662 1 2,662
OS-141 2 1 407 1 407
OS-142 7 1 1,840 1 1,840
OS-143 8 1 1,753 1 1,753
OS-144 7 1 1,733 1 1,733
OS-145 6 1 1,293 1 1,293
OS-146 7 1 1,815 1 1,815
OS-147 6 1 1,368 1 1,368
OS-148 18 1 4,628 1 4,628
OS-149 20 1 6,036 1 6,036
OS-150 9 1 2,017 1 2,017
OS-151 11 1 2,692 1 2,692
OS-152 16 1 3,544 1 3,544