Abstract
The earthquake and tsunami of 2010, triggered changes in the geomorphological and sedimentary dynamics along the coast of Pichilemu, in central Chile. These changes were evidenced through the retreat and erosion of sandy beaches and coastal sand dunes. Modifi cation patterns were identifi ed through analysis of satellite images prior to and after the earthquake/tsunami, and compared with records from geomorphological fi eldwork carried out in 2004 that measured essential features of representative beach profi les in the headland bay beaches. The variability of beaches dominated by waves was analyzed. The results indicate that there is coastal erosion and a change in the sedimentary balance associated with the subsidence of the coast, and that four years after the earthquake/tsunami, after the erosive phase, a change in tendency towards progradation of sandy coastlines in the headland bay beaches can be observed
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