Tidal triggering of earthquakes is the idea that tidal forces may induce seismicity. In connection with earthquakes, syzygy refers to the idea that the combined tidal effects of the sun and moon – either directly as earth tides in the crust itself, or indirectly by hydrostatic loading due to ocean tides – should be able to trigger earthquakes in rock that is already stressed to the point of fracturing, and therefore a higher proportion of earthquakes should occur at times of maximal tidal stress, such as at the new and full moons.
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| - Déclenchement de tremblements de terre par effet de marée (fr)
- Tidal triggering of earthquakes (en)
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| - Le déclenchement de séismes par effet de marée ou « déclenchement tidal de séismes » est une hypothèse proposant que les forces de marée (marées de la pesanteur) qui déplacent verticalement la croûte terrestre peuvent induire une sismicité significative, voire contribuer à déclencher des tremblements de terre. De petits séismes régulièrement provoqués par l'effet de marée pourraient jouer un rôle stabilisateur en contribuant à un mécanisme de détente des tremblements de Terre. (fr)
- Tidal triggering of earthquakes is the idea that tidal forces may induce seismicity. In connection with earthquakes, syzygy refers to the idea that the combined tidal effects of the sun and moon – either directly as earth tides in the crust itself, or indirectly by hydrostatic loading due to ocean tides – should be able to trigger earthquakes in rock that is already stressed to the point of fracturing, and therefore a higher proportion of earthquakes should occur at times of maximal tidal stress, such as at the new and full moons. (en)
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| - Le déclenchement de séismes par effet de marée ou « déclenchement tidal de séismes » est une hypothèse proposant que les forces de marée (marées de la pesanteur) qui déplacent verticalement la croûte terrestre peuvent induire une sismicité significative, voire contribuer à déclencher des tremblements de terre. De petits séismes régulièrement provoqués par l'effet de marée pourraient jouer un rôle stabilisateur en contribuant à un mécanisme de détente des tremblements de Terre. (fr)
- Tidal triggering of earthquakes is the idea that tidal forces may induce seismicity. In connection with earthquakes, syzygy refers to the idea that the combined tidal effects of the sun and moon – either directly as earth tides in the crust itself, or indirectly by hydrostatic loading due to ocean tides – should be able to trigger earthquakes in rock that is already stressed to the point of fracturing, and therefore a higher proportion of earthquakes should occur at times of maximal tidal stress, such as at the new and full moons. Previously, scientists have searched for such a correlation for over a century, but with the exception of volcanic areas (including mid-ocean spreading ridges) the results have been mixed. It has been suggested that some negative results are due to failure to account for tidal phase and fault orientation (dip), while "many studies reporting positive correlations suffer from a lack of statistical rigor." One systematic investigation found "no evidence for an increase in seismicity during intervals of large tidal range but there is clear evidence for small but significant increase in earthquake rates near low tide"; it did not find an increase of earthquakes near peak spring tides. Seismicity is favored at low tides, particularly for reverse faults, because unloading unclamps the fault, reducing friction. Ocean loading has no effect at all on strike-slip faults. Research work has shown a robust correlation between small tidally induced forces and non-volcanic tremor activity.Volcanologists use the regular, predictable Earth tide movements to calibrate and test sensitive volcano deformation monitoring instruments. The tides may also trigger volcanic events. (en)
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