11 February 2019

Beatriz Benjumea shows the integration of geophysical and borehole information to characterize Holocene sediments in the Ebro Delta (Spain). Nowadays, this delta coastline is retreating landward due to a combination of sediment subsidence, sea level rise and sediment deficit caused by river damming. Measuring spatial changes of near-surface sediment facies is critical to evaluate subsidence. In this presentation, geophysical patterns that help to characterize the Holocene sequence are extracted from borehole and geophysical information at two test sites. The applied methods are: active and passive seismic and electrical resistivity tomography (ERT). These patterns are then used in an extended survey along the delta with the following targets: to discriminate between surficial sediments facies, to detect the top of the Prodelta marine clays and finally to image the base of the Holocene delta.

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