Paleoseismic Events Reflected in Late Pleistocene and Holocene Deposits of the Terraces of Imandra Lake (Kola Region, Fennoscandian Shield)

Evidence for postglacial seismicity in lacustrine records in the western Kola Peninsula (north-western Russia)

“…The epicenter of the earthquake on June 26, 1996 ( M w = 2.8) with a focus depth of 16 km, was located beneath the bottom of Lake Imandra (Godzikovskaya et al, 2010). Traces of past strong earthquakes with an intensity I 0 ⩾ VIII points on the MSK-64 scale were found in the study area and adjacent territories (Nikolaeva, 2022; Nikolaeva et al, 2018; Romanenko et al, 2011).…”

“…Segments of the sublatitudinal fault that bound Lake Babinskaya Imandra from the south were also reactivated. The horizons reflecting the Late Pleistocene and Holocene seismic events are recorded in the loose sediments of the Imandra Lake terraces (Nikolaeva, 2022). These events led to the occurrence of secondary deformations (phenomena of liquefaction, cracks, and dykes) in the sandy-silty sediments.…”

Climate Change and Catastrophes

“…For example, the period of deglaciation of the Fennoscandian (Baltic) crystalline shield was accompanied by pronounced tectonic activity: a wide manifestation of various faults of different ranks and an increased level of seismicity. Based on the study of seismites of the Kola Peninsula, it was established [25] that increased seismic activity (magnitude ≥6) was observed not only in the Kola region, but also throughout Fennoscandia in the interval 12900-11500 years ago (end of the Younger Dryas -beginning of the Preboreal) and then in the interval 11500-9900 years (Preboreal -beginning of the Boreal period). The extension of events in time is associated not only with the fact that it takes the certain time to pass through the zone of action of hard radiation, but also with inertial and compensatory processes (they are not considered here).…”