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Relative sea-level change and palaeoearthquakes at Lopud island (Dubrovnik archipelago, Southern Adriatic, Croatia)

Fixed sea-level indicators represent one of the best lines of evidence of RSL change as they always occur within a restricted elevation range with respect to the surface of the sea. The coralline alga Lithophyllum byssoides can, in favourable conditions, construct algal rims revealed to be a good proxy record suitable for reconstructions of relative sea-level change. The vertical precision of L. byssoides in the microtidal environment comes from the restricted environmental conditions of the alga, while the 14C dating allowed precise geochronological control since the marine radiocarbon reservoir effect was determined. A detailed survey of Lopud Island allowed the distinction of seismotectonically uplifted sector of coast. The established high-resolution geochronology enables to separate coseismic uplift events from periods of interseismic subsidence. Consequently, we provide the first reconstruction of assumed number, timing, and displacements of past seismic events. The most important uplift occurred in well-known AD 1667 Dubrovnik earthquake. After correction for local coseismic displacements, the sea-level trends were quantified with full consideration of the available uncertainty. This high-resolution study confirmed the precision of L. byssoides bioconstructions not only in studies of RSL variations but also in the studies of palaeoearthquakes in seismotectonically active areas. This research was supported by Croatian Science Foundation project HRZZ-IP-2019-04-9445 – Relative sea-level change and climate change along the eastern Adriatic coast – SEALeveL.

Lythophilum byssoides ; Tidal notch ; Coastal geomorphology ; 1667 CE Dubrovnik earthquake

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