History of event deposit studies in Beppu Bay, Kyushu, southwest Japan

Low-frequency events, such as earthquakes or eruptions, that can cause large-scale disasters are a major issue for society. These events have a long occurrence interval, and their event deposits, which are preserved for a long time, are the key to revealing their real image. In Beppu Bay, event deposit research began with active fault studies in the 1980s, and it has subsequently been conducted by many researchers and from several perspectives. This accumulated knowledge has been revealing not only the paleo-event records but also their complicated recording processes. It is important for the development of event deposit analysis to understand all recording processes, by combining these event deposit records with paleo environmental information, ancient docu-ment records, and prospective simulations.