Related by context. Frequent words. (Click for all words.) 53 volcanic activity 52 Volcanology 50 active volcanoes 50 seismic activity 50 Grimsvotn 50 Solidum 49 volcanologists 49 Bulusan 49 seismicity 48 lava flows 48 Phivolcs 48 lava dome 48 eruptions 47 eruption 47 Mount Redoubt 46 Icelandic Meteorological Office 46 volcano 46 pyroclastic flows 46 earth tremors 46 sunspot 46 Japan Meteorological Agency 45 geomagnetic field 45 volcanism 45 volcanoes 45 Alaska Volcano Observatory 45 Surono 45 volcanic eruptions 45 sunspot activity 45 dengue cases 45 Mayon volcano 45 volcanos 44 ash plume 44 mm rainfall 44 quakes 43 Merapi 43 Kilauea volcano 43 eruptive 43 sunspots 43 magmatic 43 temblors 43 tropical cyclones 43 volcano erupted 43 Tungurahua 42 rockfalls 42 Mayon Volcano 42 Eyjafjallajokull volcano 42 volcanologist 42 volcano crater 42 Eruptions 42 magma 42 aftershocks 42 volcanic 42 strandings 42 degree celsius 41 molten rock 41 volcanic islands 41 Sulfur dioxide 41 Mount Sinabung 41 seismometers 41 vulcanologist 41 geomagnetic storm 41 nesting pairs 41 Eyjafjallajokull 41 Geophysics Institute 41 tremors 41 volcano eruption 41 magnitudes 41 subduction zones 41 tectonic 40 seismographs 40 Visitor arrivals 40 earthquakes 40 lava flow 40 lava 40 Simeulue 40 Mount Merapi volcano 40 undersea quake 40 mass extinctions 40 Mayon 39 GRBs 39 gigatons 39 crustal 39 plate tectonics 39 seismologists 39 #.# magnitude tremor 39 Geophysics Agency 39 westerly winds 39 blasts rocked 39 pedestrian fatalities 39 volcanic eruption 39 caldera 39 perigee 39 explosions 39 fatalities 39 Sustained winds 39 electron volts 39 mid latitudes 39 atmospheric concentrations 38 rockslides 38 landslides triggered 38 oscillations