PDR, MPJ and SS wish to acknowledge financial support from the Bilateral project
Mexico-India (CONACYT-DST). PDR thanks CTIC-UNAM and MPJ thanks IPN (COFAA and
EDI), Mexico. Information about 11th March tsunami was collected from Servicio Mareografico
Nacional, UNAM.We all thank Dr. Michelangelo Martini for his inputs with the geology of the
region and Adela Margarita Reyes Salas and Sonia Angeles Garcia for their help in
mineralogical analysis. The photo showing sea retreat was kindly provided by the care taker of
the Hotel Barra de Potosi. This article is the 59th contribution from Earth System Science Group
(ESSG), Chennai, India.