Dataset description: High-resolution chirp seismic-reflection data

This section of the data release contains approximately 369 line-kilometers of processed, high-resolution chirp seismic-reflection profiles that were collected aboard the R/V Snavely in 2017 on U.S. Geological Survey cruise 2017-686-FA offshore Oceanside, southern California. The along-shore and across-shore chirp profiles are oriented to assess sand and gravel resources in Federal and State waters for potential use in future beach nourishment projects along stretches of the coast where critical erosion hotspots have been identified. The chirp profiles were acquired using an Edgetech 512 Chirp sub-bottom profiling system.

Version	1
Keywords	sub-bottom profiling, geospatial datasets, marine geophysics
Data types	Sub Bottom Profiler
Format	SEG-Y
Amount	6900 MB

Contacts

Contact	Ray W Sliter PCMSC_data@usgs.gov

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Location of materials and files

Public files	https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9UELSBU/0da47f6ca7da4eadb7a5e952d0948977/2017-686_chirp.zip https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9UELSBU/dataset/9/ https://doi.org/10.5066/P9UELSBU
Metadata	https://cmgds.marine.usgs.gov/metadata/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9UELSBU/2017-686-FA_chirp_metadata.xml Outline - Questions and answers - Text - XML

Activities and equipment

Activity	Equipment
2017-686-FA	512 chirp is a seismic reflection instrument that uses sound to examine the layering of sedimentary strata on and below the sea floor. The Chirp being used in this project is a modified version of the Subscan 512 made by Edgetech. The noise it makes actually sounds like a bird's chirp; the frequencies of the sound it produces are between 500 Hz and 12 kHz. The Chirp has two advantages that allow it to get excellent penetration (meaning it can see deep, like >50 m or >64 ft, into the seabed) and high resolution (meaning it can make out fine layering, layers

Activity

Equipment

2017-686-FA

512 chirp

is a seismic reflection instrument that uses sound to examine the layering of sedimentary strata on and below the sea floor. The Chirp being used in this project is a modified version of the Subscan 512 made by Edgetech. The noise it makes actually sounds like a bird's chirp; the frequencies of the sound it produces are between 500 Hz and 12 kHz. The Chirp has two advantages that allow it to get excellent penetration (meaning it can see deep, like >50 m or >64 ft, into the seabed) and high resolution (meaning it can make out fine layering, layers