Do soft sediment deformations in the Late Triassic and Early Jurassic of the UK record seismic activity during the break-up of Pangea?

The lagoonal and shallow marine sediments of the Penarth Group in UK span Triassic–Jurassic boundary. These contain several disturbed levels with soft sediment deformations (SSDs), such as synsedimentary faults, injective domes, recumbent folds slumps that are recognised most basins from SW England South Wales to NW Northern Ireland. Field observations, notably close link SSDs active attest an earthquake origin SSDs. Fluids, overpressure lithology guided style their distribution sedimentary sections. Analysis directional data relating each level shows preferred orientations deformation, which correspond local state stress at time. We favour a series earthquakes, rather than single mega-event trigger observed features. extensional tectonic context was driven by opening Permo-Triassic Western Europe. suggest development multi-directional, mosaic-style occur during this early phase break-up Pangea. Our integrated tectonic/sedimentary study suggests preserved reliable reconstruct past seismic activity basin geodynamics.