SEDIMENTARY EVIDENCE OF THE 13TH CENTURY KAMIKAZE TYPHOONS FROM SOUTHWESTERN JAPAN
Here we provide results from sediment cores from two coastal lagoons on western Kyushu in southwestern Japan (Lake Daija and Lake Kawahara) that provide evidence of episodic coastal inundation over the last 2500 years. Sediment cores collected along transects connecting beach to river inlet in both lakes contain periodically finely laminated organic mud, interbeded with dense units containing both marine and terrigenous materials (a finding consistent with typhoon-induced flooding from both storm surge and extreme precipitation). Two prominent event layers are dated to approximately the late 13th century at both sites, with the timing of these deposits concurrent to two devastating typhoons that occurred during the late 13th century that closely correlate to failed Mongol invasions of 1274 AD and 1281 AD. These deposits occur during a period of more frequent marine-sourced deposition, which potentially indicates that these historical typhoons occurred during a time when tropical cyclones were more prone to making landfall along the southwestern coast of Japan.