Earthquake/ˈɜːrθkweɪk/ Definition 1 of 2Pro Tip 1/3Geological Term Used to describe the natural disaster involving the earth's surface and tectonic plates. Seismologists predict the likelihood of earthquakes. Pro Tip 2/3Unexpected Event An earthquake often happens without warning, emphasizing sudden and unpredictable events. People were caught off-guard by the earthquake. Pro Tip 3/3Intensity Variance Earthquakes vary in strength, described as 'minor' to 'catastrophic' or 'massive'. A minor earthquake rattled the windows but caused no damage.