Fig. 2From: Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast JapanBlock samples from the KYD trench and sample positions of the radiocarbon dating. The photographs, sketches, and density results were modified after Ishimura and Miyauchi (2015). Detailed locations of block samples are shown in Additional file 1: Figure S1. Red arrows indicate gradual density decrease above tsunami depositsBack to article page