We have worked with local people to create digital archives on disasters related to the ocean, such as rising sea levels and the threat to our land due to global warming, as well as the tsunami caused by the Great East Japan Earthquake. This article explains these cases.

Along the Sanriku coast, known as a "tsunami-prone area," people were prepared to face repeated encounters of large catches and disasters, good fortune and misfortune, throughout their lives. It was not a problem that could be solved by simply building a huge seawall to separate the sea from the land. The same sea that took people's lives also brought blessings, providing them sustenance and a meaning to live. In this paper, not limiting myself to Sanriku, after considering the fundamental relationship between the sea and humans, and while questioning the state of post-earthquake reconstruction efforts, I reconsider, from living by the sea, what we should really protect.

In order to reduce disasters, it is important to pass on the experiences and lessons of past disasters without letting them fade away. The Shikoku Disaster Prevention 88 Tales and Public Awareness Research Group has created an illustrated disaster prevention map and has continued public awareness activities in various parts of Shikoku. In the process, we realized that disaster tradition not only raises awareness of disaster prevention and mitigation, but also plays a role in passing on the local culture and identity.

The Japan Meteorological Agency publishes a variety of ocean information on its website, "Ocean Health Checklist," in order to contribute to coastal disaster prevention, fisheries, shipping, climate change response, and more. It has also developed and operates an ocean condition monitoring and forecasting system that combines ocean observation data and ocean simulation models and uses it as basic data for ocean information. This article provides an overview of the "Japanese Coastal Ocean Monitoring and Forecasting System (MOVE-JPN)," which was introduced in 2020, and introduces the ocean information published in the Ocean Health Checklist.

There has been no significant change in the number of typhoons hitting Japan compared to 100 years ago, but the intensity of typhoons that have hit in recent years has increased and the risks have also changed from the past. When a typhoon strikes a vulnerable city, as Typhoon Jebi did in 2018 and Typhoon Faxai in 2019, social systems can fall into critical states. We must urgently adapt information and tools that use modern science and technology to contribute to disaster prevention and mitigation and build cities that are resilient to natural disasters.