Citation:

PANGAEA.905793

Name: M74/2 raw data of EM120 multibeam echosounder (bathymetry & beam time)
Published: 2019-09-11
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Bathymetry; EM120; hydroacoustics; Makran; seismics

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Published: 2019-09-11 • DOI registered: 2020-08-01

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Abstract:

Between 07.10.2007 and 28.10.2007, bathymetric data was acquired in the Makran region during the R/V METEOR cruise M74/2. The subduction of the Eurasian plate beneath the Arab plate in the Makran Region is associated with continuous sediment input, active mud volcanism and fluid venting. The expedition was dedicated to the investigation of known seeps and the location of new venting sites. Furthermore, the scientists focused on the influence of extreme sediment thickness on the nature of vents and the relationship between local tectonics and spatial distribution of seeps. The multibeam echosounders (MBES) KONGSBERG SIMRAD EM120 and EM710 were utilized for large-scale mapping of vent-related structures on the seafloor. In order to visualize vent-related structures in the shallow subsurface, a deep-tow sidescan sonar, sediment echosounder and high resolution multichannel equipment were utilized. These acoustic methods were supplemented by video observations, gravity corer and multicorer samples, which yielded detailed information at many locations.

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 M74/2 cruise, the hull-mounted KONGSBERG SIMRAD EM120 multibeam ecosounder (MBES) was utilized to perform bathymetric mapping. The system covers full ocean depth and transmits a nominal sounding frequency of 12 kHz. It generates 191 beams with a 1°(Tx)/2°(Rx) footprint and a maximum opening angle of 140°. For further information consult: https://epic.awi.de/26725/1/Kon2007a.pdf

The acquisition mode was set to obtain equally spaced soundings on the sea floor. Yaw movements of the ship were compensated automatically by transmitting the swath perpendicular to the track rather than to the ship's axis. The opening angle was limited by either the maximum angle possible, a maximum angle set or a maximum coverage on the sea floor. Those values were adjusted to the requirements of the special surveys. For TOBI lines, which were 5.5 km apart, coverage was limited to obtain overlap at the edges of profiles. During transits in areas, which were covered before by the SIMRAD, swath widths were usually 6 km wide, on surveys over areas covered by data from previous cruises 7 km. Where no data were available at all, the full opening angle of 140° was set. Ship speed varied between 2.5 kn during TOBI profiles, 5 kn during seismic profiling, 8 kn for bathymetric surveys, and up to 12 kn during transits. A sound velocity profile for the cruise was delivered during the first CTD station. The depth of the water column is estimated through the two-way-travel time, beam angle and ray bending due to refraction in the water column by sound speed variations.

Responsible person during this cruise / PI: Markus Brüning

Chief Scientist: Volkhard Spiess (vspiess@uni-bremen.de)

CR: https://www.tib.eu/en/search/id/awi%3Adoi~10.2312%252Fcr_m74/

CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2007/20080085.htm

Keyword(s):

Bathymetry; EM120; hydroacoustics; Makran; seismics

Further details:

Bohrmann, Gerhard; Lahajnar, Niko; Gaye, Birgit; Spieß, Volkhard; Betzler, Christian (2010): Nitrogen Cycle, Cold Seeps, Carbonate Platform Development in the Northwestern Indian Ocean, Cruise No.74, August 31 - December 22, 2007. METEOR-Berichte, Leitstelle Meteor, Institut für Meereskunde der Universität Hamburg, 10-3, 212, https://doi.org/10.2312/cr_m74

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Latitude: 25.178300 * Longitude: 56.373900

Date/Time Start: 2007-10-07T00:00:00 * Date/Time End: 2007-10-28T00:00:00

Event(s):

M74/2-track * Latitude Start: 25.178300 * Longitude Start: 56.373900 * Latitude End: 25.178300 * Longitude End: 56.373900 * Date/Time Start: 2007-10-07T00:00:00 * Date/Time End: 2007-10-28T00:00:00 * Location: northwestern Indian Ocean * Campaign: * Basis: * Method/Device: Underway cruise track measurements (CT) * Comment: Fujayrah Harbor - Fujayrah Harbor

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:

1756 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
0001_M74-2_EM120_20071008_144123.all	ALL	10391	0001_M74-2_EM120_20071008_144123.all
0002_M74-2_EM120_20071008_154123.all	ALL	6941	0002_M74-2_EM120_20071008_154123.all
0003_M74-2_EM120_20071008_164123.all	ALL	6604	0003_M74-2_EM120_20071008_164123.all
0004_M74-2_EM120_20071008_174123.all	ALL	6355	0004_M74-2_EM120_20071008_174123.all
0005_M74-2_EM120_20071008_184123.all	ALL	6162	0005_M74-2_EM120_20071008_184123.all
0006_M74-2_EM120_20071008_194123.all	ALL	11097	0006_M74-2_EM120_20071008_194123.all
0007_M74-2_EM120_20071008_214123.all	ALL	5724	0007_M74-2_EM120_20071008_214123.all
0008_M74-2_EM120_20071008_224123.all	ALL	5603	0008_M74-2_EM120_20071008_224123.all
0009_M74-2_EM120_20071008_234122.all	ALL	6507	0009_M74-2_EM120_20071008_234122.all
0010_M74-2_EM120_20071009_004122.all	ALL	7382	0010_M74-2_EM120_20071009_004122.all
0011_M74-2_EM120_20071009_014122.all	ALL	7712	0011_M74-2_EM120_20071009_014122.all
0012_M74-2_EM120_20071009_024122.all	ALL	7505	0012_M74-2_EM120_20071009_024122.all
0013_M74-2_EM120_20071009_034122.all	ALL	7490	0013_M74-2_EM120_20071009_034122.all
0014_M74-2_EM120_20071009_044122.all	ALL	7570	0014_M74-2_EM120_20071009_044122.all
0015_M74-2_EM120_20071009_054122.all	ALL	9360	0015_M74-2_EM120_20071009_054122.all
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0021_M74-2_EM120_20071009_114122.all	ALL	13845	0021_M74-2_EM120_20071009_114122.all
0022_M74-2_EM120_20071009_124122.all	ALL	12497	0022_M74-2_EM120_20071009_124122.all
0023_M74-2_EM120_20071009_134122.all	ALL	15510	0023_M74-2_EM120_20071009_134122.all
0024_M74-2_EM120_20071009_144122.all	ALL	11956	0024_M74-2_EM120_20071009_144122.all
0025_M74-2_EM120_20071009_154122.all	ALL	9830	0025_M74-2_EM120_20071009_154122.all
0026_M74-2_EM120_20071009_164122.all	ALL	9544	0026_M74-2_EM120_20071009_164122.all
0027_M74-2_EM120_20071009_174122.all	ALL	8679	0027_M74-2_EM120_20071009_174122.all
0028_M74-2_EM120_20071009_184122.all	ALL	8407	0028_M74-2_EM120_20071009_184122.all
0029_M74-2_EM120_20071009_194122.all	ALL	8148	0029_M74-2_EM120_20071009_194122.all
0030_M74-2_EM120_20071009_204122.all	ALL	8344	0030_M74-2_EM120_20071009_204122.all
0031_M74-2_EM120_20071009_214122.all	ALL	8427	0031_M74-2_EM120_20071009_214122.all
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0033_M74-2_EM120_20071009_234121.all	ALL	8995	0033_M74-2_EM120_20071009_234121.all
0034_M74-2_EM120_20071010_004121.all	ALL	9841	0034_M74-2_EM120_20071010_004121.all
0035_M74-2_EM120_20071010_014121.all	ALL	10232	0035_M74-2_EM120_20071010_014121.all
0036_M74-2_EM120_20071010_024121.all	ALL	10689	0036_M74-2_EM120_20071010_024121.all
0037_M74-2_EM120_20071010_034121.all	ALL	11019	0037_M74-2_EM120_20071010_034121.all
0038_M74-2_EM120_20071010_044121.all	ALL	10491	0038_M74-2_EM120_20071010_044121.all
0039_M74-2_EM120_20071010_054121.all	ALL	10716	0039_M74-2_EM120_20071010_054121.all
0040_M74-2_EM120_20071010_064121.all	ALL	21812	0040_M74-2_EM120_20071010_064121.all