Related by context. Frequent words. (Click for all words.) 66 subduction zone 63 Cascadia subduction zone 62 subduction zones 58 Cascadia Subduction Zone 56 earth crust 55 oceanic crust 54 lithosphere 54 tectonic plate 53 subduction 53 continental crust 53 Earth crust 52 seismically active 52 crustal 52 earthquakes 52 Tsunamis 52 San Andreas Fault 51 geologically active 51 tectonic 51 quakes 51 volcanism 51 magmatic 51 foraminifera 50 seismic activity 50 Seismologists 50 seismologists 50 Chicxulub 50 igneous rock 50 magnetar 50 seismicity 50 tectonic plates collide 49 Hayward Fault 49 seismology 48 Celebes Sea 48 tectonics 48 biodiversity hotspot 48 Madrid Seismic Zone 48 ocean ridges 47 basaltic 47 volcanic gases 47 Natural Hazards 47 magma chamber 47 Hawaiian Volcano Observatory 47 marine sediments 47 Pacific Decadal Oscillation 47 hydrothermal activity 47 amplitudes 47 seismically active regions 47 deformation 47 seafloor 47 faultline 47 USGS geophysicist 46 Mount Kelud 46 volcanic plume 46 sedimentary rock 46 seamount 46 Madrid Fault 46 stromatolites 46 Ocean acidification 46 temblors 46 Younger Dryas 46 hydrothermal vent 46 quakes measuring 46 supercontinent 46 volcanically active 46 undersea quake 46 magnetic reconnection 46 meteoroid 46 anisotropy 46 tsunamis 46 explosive eruptions 46 extensional 46 basalts 45 Valles Marineris 45 volcanic activity 45 methane hydrates 45 volcanic islands 45 pyroclastic flow 45 tectonic plates 45 seismometer 45 Geologically 45 photonic crystal 45 Geoscience Australia 45 Wilkins Ice Shelf 45 Athens Geodynamic Institute 45 depositional 45 ENSO 45 Nature Geoscience 45 volcano eruptions 45 Kilauea Volcano 45 temperature gradient 45 lavas 44 graphitic 44 Japan Meteorological Agency 44 GNS Science 44 bathymetry 44 porphyry mineralization 44 scarps 44 Geochemistry 44 methane hydrate 44 peridotite 44 landmasses