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  Processed seismic data of Cruise BGR97

The 3rd cooperative BGR/SMNG Arctic cruise was designed to acquire new scietific data for a better understanding of temporal and spatial lithospheric variations during rifting and its influence on the tectonic and structural evolution of the continental crust of the Laptev Sea undergoing extension since at least the Early Tertiary, and for tackling open questions regarding the evolution of the submarine permafrost zone. Although conditions for seismic measurements were worse in 1997 than in 1993 and 1994, along 4,622 km of seismic traverses reflection seismic data and wide angle reflection/refraction data from 23 OBH-(ocean bottom hydrophone) stations were collected in the Laptev and East Siberian Sea. The most prominent rift basin is the Ust' Lena Rift, which is at least 300 km wide at latitude 75°N. The Cenozoic sedimentary cover exceeds 3 km everywhere, increasing up to 14 km at two locations. In the northern part of the shelf, the complex mainly N–S-trending Anisin Basin has a basin fill of up to 10 km thickness. The New Siberian Basin which is located in the northwestern part of the study area shows an up to 9 km thick graben fill. The Laptev Horst crust is locally subdivided into several tilted blocks by deep-reaching faults and there are several half grabens of smaller extent which divide the Laptev Horst into three parts: the North, the South and the East Laptev Horst. A major west dipping listric fault of at least 250 km length separates the Laptev Horst from the Ust' Lena Rift. Results from the seismological investigation indicate that recent extension is concentrated within the narrow rift basins of the eastern Laptev Sea. From wide-angle reflection/refraction seismic measurements the seismic velocities of the crustal layers were estimated along five profiles. The layers with velocities of up to 3.5 km/s apparently consist of predominantly Cenozoic sediments. The sedimentary section showing relatively high seismic velocities of 4.5 to 5.2 km/s might be interpreted as Late Paleozoic to Mesozoic deposits or overcompacted/cemented syn-rift deposits. In the eastern shelf area a layer beneath the acoustic basement was interpreted to represent Ordovician to Early Mesozoic carbonates. The lower crust in the area under study shows relatively uniform seismic velocities of about 6.0-6.8 km/s and the velocities estimated for the crust-mantle transition are in the range of 8.0 to 8.2 km/s. The origin of a several 100 m thick layer with a relative high velocity of 3 to 3.5 km/s directly beneath the seafloor was inferred as sub-sea permafrost.
 
Citation proposal
. Processed seismic data of Cruise BGR97. https://gdk.gdi-de.org/geonetwork/srv/api/records/66c1d069-4e65-4f37-aef8-a42948d9edf7
 

Simple

Alternate title
BGR97 1997
Date ( Creation )
1997-10-15
Identifier
52ab9843-d1ee-4b65-a202-38b816fc6093
Status
completed Completed

  Point of contact

Federal Institute for Geosciences and Natural Resources  
Stilleweg 2 Hannover 30655

GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Geologie
  • geology
GEMET - Concepts, version 2.4 ( Theme )
  • geophysics
  • Geophysik
  • raw material
  • Rohstoff
Keywords ( Theme )
  • Marine geology
  • Meeresgeologie
  • Seismics
  • Seismik
  • Two-dimensional seismic reflection
  • zweidimensionale Reflektionsseismik
  • MSSP
Keywords ( Place )
  • Laptev Sea
  • Laptevsee
Access constraints
Other restrictions
Use constraints
Other restrictions
Other constraints
Allgemeine Geschäftsbedingungen, siehe https://www.bgr.bund.de/AGB - General terms and conditions, see https://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: BGR97, (c) BGR, Hannover, 1997
Spatial representation type
Vector
Metadata language
English
Character set
UTF8
Topic category
  • Geoscientific information
N
S
E
W


Distribution format
  • Shapefile (n/a )

Transfer size
2
OnLine resource
BGR97 1997 (Shapefile)  

BGR97 1997 im Format ESRI Shape

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Profil BGR97-01  

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Profil BGR97-27

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Karte im BGR-Geoviewer  

Karte im BGR-Geoviewer

Hierarchy level
Dataset

Conformance result

Date ( Publication )
2010-12-08
Explanation
siehe dazu die angegebene Durchführungsbestimmung
Statement
During the period from 20th of august to 15th of October 1997 BGR aquired seismic lines in the Laptev Sea. The lines BGR97-01, BGR97-02, BGR97-03, BGR97-04, BGR97-04A, BGR97-04B, BGR97-05, BGR97-06, BGR97-07, BGR97-08 are processed (stack) data and lines BGR97-09, BGR97-10, BGR97-11, BGR97-12, BGR97-13, BGR97-14, BGR97-15, BGR97-15A, BGR97-16, BGR97-17, BGR97-17A, BGR97-17B, BGR97-17C, BGR97-18, BGR97-19, BGR97-19A, BGR97-20, BGR97-20A, BGR97-21, BGR97-22, BGR97-23, BGR97-24, BGR97-25, BGR97-26, BGR97-27 are processed (migrated) data.

gmd:MD_Metadata

File identifier
66c1d069-4e65-4f37-aef8-a42948d9edf7   XML
Metadata language
English
Character set
UTF8
Parent identifier
06a73c56-06a2-40d8-b806-466222b0760d
Hierarchy level
Dataset
Hierarchy level name
Geophysik
Date stamp
2023-11-14
Metadata standard name
INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119
Metadata standard version
n/a

  Point of contact

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)  

Website
https://produktcenter.bgr.de  
 
 

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66c1d069-4e65-4f37-aef8-a42948d9edf7   Access to the portal Read here the full details and access to the data.

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