Related by context. Frequent words. (Click for all words.) 65 subduction zone 58 San Andreas Fault 57 Hayward Fault 57 subduction zones 55 tectonic plate 53 earthquakes 53 crustal 53 seismic activity 51 quakes 51 tsunamis 51 subduction 51 tectonics 50 seismicity 50 tectonic 50 volcanism 50 geologically active 49 tectonic plates collide 49 Seismologists 49 magnitude earthquake 49 faultline 48 seafloor 48 temblors 48 earth crust 48 tectonic plates 47 Earth crust 47 geologic 47 seismological 47 Pacific Ocean 46 undersea earthquake 46 landmasses 46 lithosphere 46 seismic 46 seismology 46 El Ninos 46 seismically active regions 46 seismologists 46 USGS geophysicist 46 Tsunamis 46 oceanic 46 seismically active 45 coastlines 45 Antarctic Ice 45 volcanic gases 45 undersea quake 45 plate tectonics 44 aftershock measuring 44 substorms 44 cyclonic storm 44 continental drift 44 heaviest precipitation 44 glacial melt 44 seamount 44 ecliptic 44 ocean currents 44 seismic waves 44 Alaska Aleutian Islands 44 Quaternary 43 mass extinctions 43 ShakeOut 43 gyre 43 equatorial Pacific 43 ENSO 43 Fault Zone 43 geophysicists 43 seamounts 43 peridotite 43 journal Geology 43 seismographs 43 anthropogenic climate 43 coast 43 glaciation 43 transect 43 Tibetan Plateau 43 Point Conception 43 magmatic 43 temblor 43 volcanic activity 42 coasts 42 seismologist 42 Geologic 42 tropical cyclones 42 coastline 42 mid latitudes 42 earthquake 42 tidal surges 42 La Niña 42 Earthquake 42 Diablo Canyon 42 decadal 42 west coast 42 greenhouse warming 42 sedimentary basins 42 hydrothermal alteration 42 basking shark 42 geomagnetic field 42 volcanology 42 supermoon 42 #.# magnitude earthquake 42 Loma Prieta 41 Juan de Fuca 41 Loop Current