noun

• (planetary geology) Such a quake specifically occurring on the planet Earth, as opposed to other celestial bodies.
  "Since the response of some man-made structures to the ground motion near the epicenter is highly dependent on frequency, a significant difference in potential damage to the structures is expected between earthquakes and moonquakes."
• (figuratively) A sudden and intense upheaval; a severely disruptive event.
  "As we have seen, economic earthquakes often result in political shockwaves. […] He highlights a correlation between those states with the highest robot density and those states that unexpectedly swung behind Donald Trump in the 2016 presidential election, namely Michigan, Pennsylvania and Wisconsin."

verb

• (intransitive) To undergo an earthquake.
  "Watch the Philippines very closely for the next little while. There is rumbling and earthquaking deep within Pinatubo and increased earthquaking within Mayon."