It is our great pleasures to present the sixth JDR Award to Prof. Masato Iguchi. Prof. Iguchi, as the top guest editor, published two JDR special issues entitled “Integrated Study on Mitigation of Multimodal disasters caused by Ejection of Volcanic Products.” These special issues, vol.11, no.1 in 2016 and vol.14, no.1 in 2019, were results of a project (2013–2018) of the Science and Technology Research Partnership for Sustainable Development (SATREPS). The second special issue set a record for the highest annual download. In addition, he was the first author or co-author of 11 papers published by JDR in 2019.

Professor Iguchi, as one of most recognized volcanologists in the world, has been leading observation research of active volcanoes as the Director of the Sakurajima Volcano Research Center of Kyoto University’s Disaster Prevention Research Institute. He has promoted geophysical research on volcanic activity not only in Japan but also in Indonesia, evaluating volcanic activity by incorporating the results of material science and demonstrating the effectiveness of long-term, multi-item observations in those processes. He has made a significant contribution to the promotion of Indonesian volcano research, taking over the strong will of former Kyoto University professors, and his contributions have culminated in the aforementioned two special issues.

On behalf of the JDR editorial board, I wish to thank Prof. Iguchi for his efforts and to congratulate him as the winner of the sixth JDR Award.