seis·​mic | \ ˈsīz-mik How to pronounce seismic (audio) , ˈsīs- \

Definition of seismic

1 : of, subject to, or caused by an earthquake also : of or relating to an earth vibration caused by something else (such as an explosion or the impact of a meteorite)
2 : of or relating to a vibration on a celestial body (such as the moon) comparable to a seismic event on earth
3 : having a strong or widespread impact : earthshaking seismic social changes

Other Words from seismic

seismically \ ˈsīz-​mi-​k(ə-​)lē How to pronounce seismic (audio) \ adverb

Examples of seismic in a Sentence

Seismic social changes have occurred.
Recent Examples on the Web When Android 12 comes to OnePlus devices over the next few months there could be a seismic shift as the original fanbase looks to move to new pastures. Ewan Spence, Forbes, 5 Nov. 2021 The United States committed today with other countries to stop financing fossil fuel projects abroad by the end of next year, in a seismic shift that could stem the construction of natural gas and oil facilities in lower-income nations. Scientific American, 4 Nov. 2021 The State newspaper reports the South Carolina Emergency Management Division is studying the seismic activity. From Usa Today Network And Wire Reports, USA TODAY, 1 Nov. 2021 As seismic activity continues to increase, La Palma could be hit with an earthquake measuring a six on the Richter magnitude scale, report Guillermo Vega and Ana Torres Menárguez for El País. Elizabeth Gamillo, Smithsonian Magazine, 1 Nov. 2021 Signs monitored by scientists —soil deformation, sulfur dioxide emissions and seismic activity— remained robust in Cumbre Vieja. Emilio Morenatti,, 31 Oct. 2021 Don Blakeman, a geophysicist for the US Geological Survey, said Sunday that the NEIC had not detected any seismic activity in the area Sunday., 12 Oct. 2021 Pakistan lies in an area noted for high seismic activity. New York Times, 6 Oct. 2021 The Guardia Civil said seismic activity in the area, which surged before the eruption and has remained strong, has stabilized. Fox News, 23 Sep. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'seismic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of seismic

1858, in the meaning defined at sense 1

History and Etymology for seismic

Greek seismos shock, earthquake, from seiein to shake; probably akin to Avestan thwaēshō fear

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Time Traveler for seismic

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The first known use of seismic was in 1858

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Last Updated

20 Nov 2021

Cite this Entry

“Seismic.” Dictionary, Merriam-Webster, Accessed 8 Dec. 2021.

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More Definitions for seismic



English Language Learners Definition of seismic

: of, relating to, or caused by an earthquake
: very great or important

More from Merriam-Webster on seismic

Nglish: Translation of seismic for Spanish Speakers


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