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INQUA Focus Group on Paleoseismology and Active Tectonics

Abstract:

The Jaramijò sea-cliff and the surrounding deposits recorded a series of natural disaster that affected the Ecuador’s central coast (Southamerican) during Upper Pleistocene to Holocene. Stratigraphic and geomorphologic studies on the area comprises between Manta and Jaramijò recognized volcanic fine ash layers (related to secondary rain-triggered lahars) interbedded with fine sand to silt layers related with tsunami events. These rhythmic alternance were discovered on different terrace order named from T1 to T4. This work recognized two new terrace (T1 and T2) related with the T3 and T4 terrace previously described by Pedoja et al.(2006). These new terrace were dated respectively 1ky and 43ky. All the stratigraphic, geomorphologic and palaeoseismologic features allow us to understand the sequence of catastrophic geological events that affected abruptly the landscape furthermore and the changes of high coastline progradation rate at the Jaramijó site.