Unravelling megaturbidite deposition: Evidence for turbidite stacking/amalgamation and seiche influence during the 1601 <scp>ce</scp> earthquake at Lake Lucerne, Switzerland

Megaturbidites are commonly used to reconstruct the seismic history (palaeoseismology) of areas where large earthquakes occur. However, depositional mechanisms and sedimentary characteristics these deposits not yet fully understood. This study unravels sequence sediment deposition that occurred in Lake Lucerne (Vitznau Basin) following 1601 ce earthquake central Switzerland. During this event, slope failures were triggered, generating mass flows turbidity currents led formation mass-transport a megaturbidite. These sampled 28 cores, which examined with X-ray computed tomography scans (medical μCT), grain-size analysis natural remanent magnetisation. suite analyses allows detailed reconstruction turbidite stacking amalgamation centre basin, followed by settling finer sediments influenced lake seiche. Initial is sandy turbidites reaching depocentre. Some sands can be linked their source areas, evidence found some being overridden peripheral parts megaturbidite deposit. Hereafter, sedimentation becomes controlled seiche-induced currents, rework fine upon deposition, leading subtle variations at base seiche-influenced sub-unit ponded geometry As seiche movement dampens, relatively muddy, homogeneous deposited drapes basin plain. Overall, provides first highly sedimentological lake, demonstrating distinct imprint seiching amalgamation/stacking. will improve recognition interpretation earthquake-induced megaturbidites other records or isolated basins, demonstrates value using (μ)CT combination traditional parameters processes megaturbidites.