Citation:

PANGAEA.902755

Name: M67-2 raw data of EM120 multibeam echosounder (bathymetry & beam time series)
Published: 2019-06-18
License: https://creativecommons.org/licenses/by/4.0/
Keywords: asphalt volcanoes; Bathymetry; EM120; Gulf of Mexico; hydroacoustics

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Abstract:

Between 14.03.2006 and 25.04.2006, bathymetric data based on the KONGSBERG EM120 system (MBES) was acquired in the Gulf of Mexico during the R/V METEOR cruise M67/2. The main research goal was the investigation of asphalt volcanoes in the Campeche Bay and related sedimentary structures. The leg was split into two parts. During the first sub-leg 2a geophysical and especially hydroacoustic methods were used to explore the distribution of these asphalt volcanoes and to map knolls as well as other structures like mass wasting and asphalt flows. Using reflection seismic, sedimentary structures related to the volcanoes were also investigated. Further mapping but also sampling of vent fluids and asphalt was the research interest of sub-leg 2b. Therefore the Remotely Operating Vehicle (ROV) QUEST (Marum) as well as a TV-MUC were used. Bathymetry mapping was done using the EM120 for deeper and the EM710 for shallower regions.

CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval.

Description of the data source:

During the M67/2 cruise, the hull-mounted multibeam echosounder (MBES) KONGSBERG EM120 was utilized to perform bathymetric mapping. It allows to conduct surveys in water depths of up to 11,000 m. Two transducer arrays transmit frequency coded acoustic signals (11.25 to 12.6 kHz). While the emission beam has a dimension of 150° across and 2° along track, the reception is obtained from 191 overlapping beams with widths of 2° across and 20° along track. The beam footprint has a dimension of 2° by 2°. For further information on the system, consult: https://www.km.kongsberg.com/

Due to the water depth of the research area the EM120 was permanently used. Only for shallower regions the EM710 was used too.

To convert the recorded travel times into water depth, several sound velocity profiles were obtained with the shipboard CTD, providing a correction for ray bending for each beam. Depth is estimated from each beam by using the two-way travel time and the known beam angle known, and taking into account the ray bending due to refraction in the water column by sound speed variations.

Responsible person during this cruise / PI: Volkhard Spieß (vspiess uni-bremen.de), Gerhard Bohrmann (gbohrmann@marum.de)

Chief Scientist: : Volkhard Spieß (vspiess uni-bremen.de), Gerhard Bohrmann (gbohrmann@marum.de)

CR: https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_m67/

CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2006/20060077.htm

Keyword(s):

asphalt volcanoes; Bathymetry; EM120; Gulf of Mexico; hydroacoustics

Related to:

dos Santos Ferreira, Christian; Wintersteller, Paul (2019): Gridded bathymetry from EM120 multibeam echosounder of R/V METEOR cruise M67/2 (Gulf of Mexico, Campeche Bay). PANGAEA, https://doi.org/10.1594/PANGAEA.902761

Further details:

Weinrebe, Reimer Wilhelm; Bohrmann, Gerhard; Spieß, Volkhard (2010): Fluid Seepage of Chile and in the Southern Gulf of Mexico - Cruise No. M67 - February 20 - April 25, 2006 - Talcahuano (Chile) - Bridgetown (Barbados). METEOR-Berichte, DFG-Senatskommission für Ozeanographie, M67, 110 pp, https://doi.org/10.2312/cr_m67

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Median Latitude: 11.242400 * Median Longitude: -69.773350 * South-bound Latitude: 9.381200 * West-bound Longitude: -79.915600 * North-bound Latitude: 13.103600 * East-bound Longitude: -59.631100

Date/Time Start: 2006-03-14T00:00:00 * Date/Time End: 2006-03-31T00:00:00

Event(s):

M67/2a-track * Latitude Start: 9.381200 * Longitude Start: -79.915600 * Latitude End: 13.103600 * Longitude End: -59.631100 * Date/Time Start: 2006-03-14T00:00:00 * Date/Time End: 2006-03-31T00:00:00 * Campaign: * Basis: * Method/Device: Underway cruise track measurements (CT) * Comment: Cristobal - Bridgetown

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator
1	File name	File name		Wintersteller, Paul
2	File format	File format		Wintersteller, Paul
3	File size	File size	kByte	Wintersteller, Paul
4	Uniform resource locator/link to file	URL file		Wintersteller, Paul

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

3612 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 File name	2 File format	3 File size [kByte]	4 URL file
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0000_20060321_005505_Meteor_M67-2_EM120.all	ALL	19380	0000_20060321_005505_Meteor_M67-2_EM120.all
0000_20060321_201539_Meteor_M67-2_EM120.all	ALL	5887	0000_20060321_201539_Meteor_M67-2_EM120.all
0000_20060325_235013_Meteor_M67-2_EM120.all	ALL	7269	0000_20060325_235013_Meteor_M67-2_EM120.all
0000_20060326_065302_Meteor_M67-2_EM120.all	ALL	6842	0000_20060326_065302_Meteor_M67-2_EM120.all
0000_20060330_150812_Meteor_M67-2_EM120.all	ALL	5527	0000_20060330_150812_Meteor_M67-2_EM120.all
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0000_20060407_173132_Meteor_M67-2_EM120.all	ALL	9006	0000_20060407_173132_Meteor_M67-2_EM120.all
0000_20060408_135000_Meteor_M67-2_EM120.all	ALL	4228	0000_20060408_135000_Meteor_M67-2_EM120.all
0000_20060410_055622_Meteor_M67-2_EM120.all	ALL	7220	0000_20060410_055622_Meteor_M67-2_EM120.all
0000_20060414_204719_Meteor_M67-2_EM120.all	ALL	8749	0000_20060414_204719_Meteor_M67-2_EM120.all
0000_20060416_091301_Meteor_M67-2_EM120.all	ALL	16255	0000_20060416_091301_Meteor_M67-2_EM120.all
0000_20060417_002743_Meteor_M67-2_EM120.all	ALL	389	0000_20060417_002743_Meteor_M67-2_EM120.all
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0001_20060404_080702_Meteor_M67-2_EM120.all	ALL	21923	0001_20060404_080702_Meteor_M67-2_EM120.all
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0003_20060326_012014_Meteor_M67-2_EM120.all	ALL	7043	0003_20060326_012014_Meteor_M67-2_EM120.all