地震発生後に地震動や地殻変動，津波の状況をリアルタイムに把握し，解析を行い，それに基づき，至近未来予測することが地震や津波の防災／減災につながるものと期待されている．これまでも，緊急地震速報などの地震動即時予測や津波の即時警報への応用がなされてきた．最近は、火山活動の観測においても噴火速報の運用も始まった．一方で，東北地方太平洋沖地震(Mw9.0)やそれに伴う津波などにより，従来の手法の弱点も明らかになり、災害軽減へ向けて更なる改善の努力が進められている．本セッションでは，（準）リアルタイムでの地震動や地殻変動，津波，火山データの即時把握と解析の新しい考え方，手法，及び，地震や津波，火山の防災／減災に向けた即時予測への有効な応用に関する研究成果について広く議論する．

As the number of population centers grows in regions with earthquake, tsunami and volcano hazards, the importance of improving methods for rapid, realtime estimates of activity increases. Realtime monitoring, analysis, and prediction of seismic ground motion, crustal movement and tsunami will be powerful tools to contribute to earthquake and tsunami disaster preparedness/mitigation. Tsunami and Earthquake Early Warning systems exist today in many locations around the world. Now JMA has started to promptly provide Eruption Notices to inform people of impending and beginning volcanic eruptions. Large events like the 2011 Tohoku Earthquake (Mw9.0) have demonstrated some of the shortcomings of existing techniques. In this session, we invite presentations on new ideas, methods and applications of (near) realtime analysis of seismic, geodetic and tsunami data, to the problem of realtime prediction aimed at improving disaster preparedness/mitigation in the fields of earthquake, tsunami and volcano observation. Presentation is encouraged to bring together scientists, engineers, and practitioners from a broad range of backgrounds from around the world, and to promote collaborative communication at the leading edge of the science and technologies.