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!Average earthquake effects
!Average frequency of occurrence globally (estimated)
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|0.0-0.9
[[Microquakes|Micromore]]
|Not felt. Recorded by seismographs.
|I
| Continual
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|1.0–1.9
|[[Microearthquake|Micro]]
|[[Also microearthquakes|Microless]]
|I
|Microearthquakes, also not felt. Recorded by seismographs.<ref>This is what Richter wrote in his ''Elementary Seismology'' (1958), an opinion copiously reproduced afterward in Earth's science primers. Recent evidence shows that earthquakes with negative magnitudes (down to −0.7) can also be felt in exceptional cases, especially when the focus is very shallow (a few hundred meters). See: Thouvenot, F.; Bouchon, M. (2008). "What is the lowest magnitude threshold at which an earthquake can be felt or heard, or objects thrown into the air?," in Fréchet, J., Meghraoui, M. & Stucchi, M. (eds), ''Modern Approaches in Solid Earth Sciences'' (vol. 2), ''Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes,'' Springer, Dordrecht, 313–326.</ref>
|Also Continual/several million per year
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|2.0–2.9
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