Natural hazards (giant subduction zone thrust earthquakes)

3.2 Volcanic eruptions
Volcanic eruptions and seismicity are closely intertwined, particularly in regions along subduction zones. In Japan, a country located along the Pacific Ring of Fire, the Pacific and Philippine plates subduct beneath the Okhotsk and Eurasian plates at rates of 8-9 cm/year and 5-6 cm/year, respectively. This tectonic movement generates intense seismic activity, including frequent earthquakes and volcanic eruptions. Volcanic activity, such as that observed at Mount Aso in southern Japan, is often triggered by the movement of magma towards the surface, which can be facilitated by the fracturing of rocks during earthquakes. The Kumamoto earthquake sequence of 2016, which included a mainshock of Mw 7.0, exemplifies this interaction. Besides Japan, notable eruptions include the 1980 eruption of Mount St. Helens in the United States, which was triggered by a massive landslide that uncapped the volcano's magma chamber, leading to a violent explosion and widespread ashfall. In Indonesia, the 1883 eruption of Krakatoa was one of the deadliest in recorded history, producing colossal tsunami and significantly impacting global climate. Similarly, the 2010 eruption of Eyjafjallajökull in Iceland highlighted the far-reaching effects of volcanic activity, as its ash plume disrupted air travel across Europe for weeks. Each of these eruptions is associated with complex tectonic settings, such as subduction zones or rift zones, where the movement of tectonic plates generates the necessary conditions for magma to rise to the surface.

Main topics of research:

• Impact of earthquake-induced fracturing on magma ascent and volcanic Activity
• Hydrothermal and geochemical changes due to seismic and volcanic activity
• Long-term monitoring and modelling of seismic-volcanic interactions
• Influence of volcanic eruptions on geothermal energy potential