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. 2018 Sep 11;8:13620. doi: 10.1038/s41598-018-31956-8

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Location and bathymetry of the southwestern Ryukyu Arc. (a) Index map of the Ryukyu Arc. (b) Bathymetry of the southwestern Ryukyu Arc. Coasts marked in red contain tsunami deposits and boulders^9,10. Previously proposed source models of the 1771 tsunami are indicated by orange^23,24, yellow²⁵ and pink²⁶ rectangles. Blue lines indicate the seismic survey lines with CDP numbers. Small squares indicate the locations of sediment cores⁴³. The orange dotted line is a strike-slip fault and the sky blue dotted lines indicate the deformation front. The yellow dashed oval shows an uplift zone in the accretionary prism and the forearc basin, and the arrow in the oval indicates the azimuth of the relative motion between Yonaguni-jima and the PSP³¹. The maps were produced using GMT 4.5⁴⁶ and Adobe Illustrator CS6.