Fig. 9 | Scientific Reports

Fig. 9

From: Soft-sediment deformation structures in Holocene coastal gravel deposits reveal two 1.8–2.0 ka old Mw > 7.0 earthquakes in southern-central Hispaniola

Fig. 9

(a) Aerial view and (b) stratigraphic section of Tortuguero Beach showing the location of the stratigraphic sequences and geochronological samples. (c) Probability density plots (grey) denote age distributions for each sample modeled using the high-probability density range method. Radiocarbon ages are expressed as calibrated calendar intervals of years before present (BP) for a probability level of 95.4% (2σ, blue lines) and 68.2% (1σ, red lines). Age distributions for a probability level of 1σ allow us to constrain the age of two paleo-earthquakes at 2000 years BP (Eq. 1) and 1800 years BP (Eq. 2), separated by a recurrence interval of about 200 years. (d) Scheme of the density inversion in a water-saturated upward coarse-grained sequence that, during an earthquake, produces its gravitational instability, the mobilization of sands and their expulsion upwards, giving rise to SSDS.

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