Laptev Sea Rift Seismological Network (SIOLA) Part I

• Main Authors: Geissler, Wolfram, Shibaev, Sergey, Krüger, Frank, Baranov, Boris, Haberland, Christian, Tsukanov, Nikolai, Ploetz, Aline, Vollmer, Daniel, Pravkin, Sergey
• Other Authors: Deutsches GeoForschungsZentrum GFZ, GEOFON Data Centre, [e-mail], Geophysical Instrument Pool Potsdam (GIPP), Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany, Yakutsk Branch Federal Research Centre Geophysical Survey, Russian Academy of Sciences, Yakutia, Russian Federation, University of Potsdam, Potsdam, Germany, P.P. Shirshov Institute of Oceanology of the Russian Academy of Sciences, Moscow, Russian Federation, GFZ German Research Centre for Geoscience Helmholtz Centre Potsdam, Potsdam, Germany, Arctic and Antarctic Research Institute, St. Petersburg, Russian Federation
• Format: Dataset
• Language: English
• Published: GFZ Data Services 2020
• Subjects: Broadband seismic waveforms; Seismic monitoring; temporary local seismic network; Arctic; Siberia; continental rifting; Laptev Sea; Siberian Craton; Verkhoyansk Fold-and-Thrust Belt; EARTH SCIENCE > SOLID EARTH; In Situ/Laboratory Instruments > Magnetic/Motion Sensors > Seismometers; In Situ Land-based Platforms > GEOPHYSICAL STATIONS/NETWORKS; In Situ Land-based Platforms > GEOPHYSICAL STATIONS/NETWORKS > SEISMOLOGICAL STATIONS; Arctic Ocean; Gakkel Ridge; Verkhoyansk; Eurasia Basin; khatanga; laptev; lena delta
• Online Access: https://doi.org/10.14470/3O7561738646

Abstract The Laptev Sea region is one of the very few places on Earth where mid-ocean spreading centres continue into continental rift zones. The Gakkel Ridge, the active spreading centre in the Eurasia Basin of the Arctic Ocean, is characterized by well-defined seismicity close to its axial graben. In contrast below the Laptev Sea Shelf, which consists of a series of sediment filled grabens (500 km wide, 700 km long), only more diffuse seismic activity is observed. The pre-rift basement in the Laptev Sea is most probably formed by Late-Paleozoic and Late-Mesozoic fold belts. The Laptev Rift Basin is filled with Upper Cretaceous and Cenozoic sediments of variable thickness (1.5 to 14 km). The westernmost limit of seismicity is located close to edge of thick lithosphere of the Siberian Shield, which indicates some structural control on the recent tectonic activity. Focal depths are mainly less than 25 km (continent) and less than 10 km (ocean). Sparse observations of upper mantle earthquakes are under debate. The pole of rotation is very close to the study area, most probably to the south of Lena delta. Existing data indicate changes between compressional and extensional tectonic phases over short distances. This might be a consequence of the fact that the pole of rotation is close to our study area. The Khatanga-Lomonosov Shear Zone marks the border between the Gakkel Ridge and Laptev Sea Rift System, but its nature and extent are debated. Crustal extension seems to be concentrated in the eastern Laptev Sea area. Fault plane solutions are sparse and mostly not well determined to describe the movements in greater detail. Thus, with this project we intend to investigate details on tectonic movements in the Laptev Sea to better describe this amagmatic rifting and its consequences in an Arctic and global context. In general, we intend to increase the number of seismological stations for monitoring local earthquakes in the Laptev Sea/Lena delta region to fulfil the following objectives: (1) Location of ...