Citation:

PANGAEA.974808

Name: Seismic processed data (Ocean Bottom Seismometer working area dataset, profile P400) during RRS JAMES COOK cruise JC228, Guatemala Basin, North Pacific Ocean
Published: 2025-02-03
License: https://creativecommons.org/licenses/by/4.0/
Keywords: OBS; ocean bottom seismometer; oceanic crust; Pacific Ocean; Seismic wide-angle reflection and refraction data

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Published: 2025-02-03 • DOI registered: 2025-03-28

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Abstract:

The data comprise processed active-source seismic data acquired with ocean bottom seismometer (OBS) along profle P400. The data were collected in the Guatemala Basin of the Eastern Pacific Ocean during the joint German/United Kingdom expedition JC228 of the research vessel RRS JAMES COOK in December of 2022. The data set consists of 11 OBS stations deployed at an interval of 7.5 km receiving shots of a tuned 5000 cubi-inch airgun array, fired at an interval of 75 m, along a 90 km long profile. Each OBS consists of 4 channels (channel 1: hydrophone; channel 2: horizontal component 1; channel 3: horizontal component 2; channel 4: vertical component).

Keyword(s):

OBS; ocean bottom seismometer; oceanic crust; Pacific Ocean; Seismic wide-angle reflection and refraction data

Related to:

Grevemeyer, Ingo; Henstock, Timothy J; Dannowski, Anke: Ancillary navigational metadata from seismic processed data (Ocean Bottom Seismometer working area dataset, profile 400) during RRS JAMES COOK cruise JC228, Guatemala Basin, Eastern Pacific Ocean. Ancillary_navigational_metadata_from_seismic_processed_data_Ocean_Bottom_Seismometer_working_area_dataset_profile_P400_during_RRS_JAMES_COOK_cruise_JC228.zip

Funding:

Federal Ministry of Education and Research (BMBF), grant/award no. 03G0295OA : SO-OFEG - GUATOPS; IODP preliminary investigations on Moho in the Guatemala Basin; Project: Seismic images

NERC National Capability Funding, grant/award no. NE/M021246/1 : From Ridge to Trench, MoHole to Bend-Faults

Coverage:

Median Latitude: 9.615727 * Median Longitude: -88.142773 * South-bound Latitude: 9.356200 * West-bound Longitude: -88.359300 * North-bound Latitude: 9.874500 * East-bound Longitude: -87.926000

Event(s):

JC228_P400_OBS235 * Latitude: 9.614100 * Longitude: -88.141300 * Campaign: * Basis: * Method/Device: Ocean bottom seismometer (OBS) * Comment: Event coordinates refer to the OBS deployment position

JC228_P400_OBS401 * Latitude: 9.874500 * Longitude: -88.359300 * Campaign: * Basis: * Method/Device: Ocean bottom seismometer (OBS) * Comment: Event coordinates refer to the OBS deployment position

JC228_P400_OBS402 * Latitude: 9.823900 * Longitude: -88.316800 * Campaign: * Basis: * Method/Device: Ocean bottom seismometer (OBS) * Comment: Event coordinates refer to the OBS deployment position

Comment:

The data are provided in SEG-Y format (reduced with 8 km/s and recording time starting at -1 s). Each uploaded file (44 files in total) consists of the airgun shots recorded with the individual Ocean-Bottom-Seismometers (OBS).

The naming convention is as follows using one file p400.obs401.1.sgy as an example:

p400: profile name of JC228 survey

obs401: OBS-station number (from 401 to 410 & 235)

1: channel number (1, 2, 3, 4)

sgy: data type

Each segy-data file has header-information set that can be used for plotting and analyses:

trace-count (tracr, byte : 1) shotpoint number (byte: 17-20)

shot X coordinate (sx, byte :73-76, coordinate: latitude x 360000)

shot Y coordinate (sy, byte: 77-80, coordinate: longitude x 360000)

OBS X coordinate (gx, byte: 81-84, coordinate: latitude x 360000)

OBS Y coordinate (gy, byte: 85-88, oordinate: longitude x 360000)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Event label	Event		Grevemeyer, Ingo
2	Binary Object	Binary		Grevemeyer, Ingo
3	Binary Object (Media Type)	Binary (Type)		Grevemeyer, Ingo
4	Binary Object (File Size)	Binary (Size)	Bytes	Grevemeyer, Ingo
5	Binary Object (MD5 Hash)	Binary (Hash)		Grevemeyer, Ingo
6	File content	Content		Grevemeyer, Ingo	Ocean bottom seismometer (OBS)