Definition of seismic in US English:



  • 1Relating to earthquakes or other vibrations of the earth and its crust.

    • ‘Scientists currently are monitoring the seismic activity, as well as volcanic gasses being emitted and the swelling and contracting of the volcanic dome.’
    • ‘The center said there were 43 mudslides, most of them located in Nantou County, where the seismic activity has made the county prone to mudflows.’
    • ‘Scientists said they believe the seismic activity is being caused by pressure from a reservoir of molten rock a little more than a mile below the crater.’
    • ‘Intermediate and long-term predictions on timescales of between 1 and 100 years are generally based on past records of seismic activity.’
    • ‘Unpredicted pestilence, volcanic and seismic activity uprooted peoples from their established communities, forcing them to travel through uncharted territories.’
    • ‘One boon was a new awareness of the extent to which seismic activity affects Yellowstone's geothermal features.’
    • ‘The earthquakes indicate releases of seismic energy and magma movement.’
    • ‘The Earth's core is releasing a great deal of energy and it explains the weather patterns, the increase of seismic activity and volcanism.’
    • ‘The region experiences a high rate of seismic activity, making it susceptible to earthquake damage.’
    • ‘It also became apparent that the ridges are prime sites of seismic activity and basaltic eruption.’
    • ‘The seismic activity on the volcano is not changing at all while these emissions are taking place.’
    • ‘The Government has already identified areas that are vulnerable to earthquake based on seismic activity.’
    • ‘The Indonesian archipelago sits on the Pacific Rim of Fire, noted for its volcanic and seismic activity.’
    • ‘In 1994, Tolstoy and her team deployed equipment on the ocean floor to record both seismic activity and tides.’
    • ‘Through measuring seismic activity, these scientists expect to predict an approaching eruption months in advance.’
    • ‘Area vulcanologists said seismic activity remained at stable, non-threatening levels.’
    • ‘We considered as positively correlated only those values clearly showing a marked deviation from the average seismic activity.’
    • ‘There were also seismic activity earthquakes in central California.’
    • ‘Tedesco said the researchers' major concern is possible seismic activity under Lake Kivu.’
    • ‘The analysis concerns the seismic activity occurring during 1874-1913.’
    1. 1.1 Relating to or denoting geological surveying methods involving vibrations produced artificially by explosions.
      • ‘Problems often occur with seismic surveying at sea, such as battery power that is sapped after a few months and release mechanisms that do not perform correctly.’
      • ‘By the 1980s, many other countries were funding the collection of deep seismic reflection data for academic research.’
      • ‘The fishermen also blame the seismic work of oil companies, setting off explosions on the sea floor which may be responsible for killing many of the cod fry.’
      • ‘Others say that the squid deaths have been caused by underwater seismic surveys using air guns.’
      • ‘Someone had to man the rigs and further seismic surveying would be based at a nearby port.’
      • ‘Thus, recognition and mapping of the Hardangerfjord Shear Zone in the North Sea requires deep seismic data.’
      • ‘Evaluation of the new seismic data from Bulgaria had yielded very interesting results, he said.’
      • ‘In spite of these reservations, the implications of applying the structural method to the seismic data are investigated in the following section.’
      • ‘Deep seismic profiles show marked changes in structure along the orogen.’
      • ‘The method can be used for large-scale seismic data transmission.’
      • ‘The best way to reduce the risk to marine life posed by seismic testing is to avoid conducting such surveys in rich environments, the biologist concluded.’
      • ‘The petroleum industry in particular invested heavily in these advances, being largely concerned with seismic surveying.’
      • ‘Before the wells were dug, surveys and seismic testing had to be undertaken using sonar equipment, to find the best site for digging.’
      • ‘From our new seismic dataset, we verify this crustal pattern.’
      • ‘Seismology tells us only about physical properties such as seismic velocity, attenuation, and, more indirectly, temperature.’
    2. 1.2 Of enormous proportions or effect.
      ‘there are seismic pressures threatening American society’
      • ‘For this to happen it will take a cultural change of seismic proportions.’
      • ‘It is a reminder that travel can have a seismic effect, either on the travellers and their homeland or the places visited.’
      • ‘Cramer believes that US broadcasting underwent a seismic shift on September 11 last year.’
      • ‘Reading some of the editorials you would think it was an event of seismic proportions.’
      • ‘Barring an event of seismic proportions, the ruling party's candidate will be Namibia's President-elect.’


Mid 19th century: from Greek seismos ‘earthquake’ (from seien ‘to shake’) + -ic.