|FDSN code||8B (2016-2027)||Operated by||Alfred Wegener Institute (AWI)|
|Network name||Laptev Sea Rift Seismological Network (SIOLA)||Deployment region||Germany|
|Start date||2016-07-01||End date||2027-09-09|
The Laptev Sea region is one 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 Sibirian Shield, which indicates some structural control on the recent tectonic activity. Focal depths are mainly <25 km (continent) and <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 is debated.
|Digital Object Identifier (DOI)||No DOI is registered for this network.|
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