1. Coastal and Marine Hazards and Resources
  2. Geoscience Data System
  3. Dataset 40759

Dataset description: High-resolution Chirp seismic-reflection data

High-resolution Chirp seismic-reflection data were collected offshore south-central California as part of a geophysical survey aboard the NOAA Ship Rainier during two legs at sea, the first from 8/28/2018 to 9/7/2018 and the second from 9/10/2018 to 9/21/2018. The data were collected using an Edgetech 512i towfish with a 1-6 kHz sweep. Consistently high winds and rough seas prevented additional Chirp data collection and caused noisy data in some cases, especially during the second leg of the survey, which largely took place in the southern part of the study area. The Chirp data were post-processed to include filtering and other noise removal corrections.
Version1
Keywordssub-bottom profiling
Data typesSub Bottom Profiler
FormatSEG-Y;
Amount805.8 MB

Contacts

Contact
Daniel J Kennedy
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Location of materials and files

Public fileshttps://doi.org/10.5066/P9JU17GE
Metadatahttps://cmgds.marine.usgs.gov/metadata/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9JU17GE/CalDIG_2018-641-FA_CHIRP_Metadata.xml
Outline - Questions and answers - Text - XML

Activities and equipment

ActivityEquipment
2018-641-FA512 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