Volcano tectonic seismicity is an important tool in being able to predict the eruptions of volcanoes. Seismic activity occurs as a precursor to most large eruptions. We can use tectonic events to predict eruptions in long dormant volcanoes. Some notable examples of volcanoes preceded by volcano tectonics include: Nevado del Ruiz (1985), Pinatubo (1991), Unzen (1990), and Cotopaxi (2002). Volcano Tectonic characteristics happen in near real time with magmatic intrusion.