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|Microearthquakes, 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>
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