Across the centuries, forming cooperative networks beyond cultural boundaries has been a way to overcome natural disasters.
A Nagoya University researcher and his leading international research group discovered a Great Platform built with different kinds of stone at the archeological site of San Andrés, El Salvador, and challenged the prevailing theory regarding the sociocultural development of Southeastern Maya frontier.
San Andrés is located in the Zapotitan Valley, El Salvador, known as Southeastern Maya zone. Archaeological investigation conducted during 40's and 90's has shown that San Andrés had long human occupation beginning from the Middle Preclassic (ca. 600 BC) until the Early Postclassic (ca. AD 1200), in which had role as political, economic and religious center during the Late Classic period (AD 600-900). As San Andrés has been affected by numerous explosive eruptions -- at least three or four -- during the past two millennia, archaeologists have been interested to understand the role of volcanic eruptions in human history.
Between February and May of 2016, the research group led by Assistant Prof. Akira Ichikawa of the Institute for Advanced Research and at the Graduate School of Letters, Nagoya University, made a new discovery that allowed them to reconsider the recovery process from the volcanic eruption of Ilopango (ca. AD 400-450), which was one of the greatest Holocene eruptions in Central America. Assistant Prof. Ichikawa explained: "We have discovered a masonry platform just above the ash caused by the Ilopango eruption in San Andrés, which could prove that people reoccupied in such a devastated area even immediately after the enormous disaster occurred."