# Alexis Perrey

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**Alexis Perrey** (1807–1882) was a historical French [seismologist](/source/Seismologist) and compiler of earthquake catalogs.[1] He is considered a pioneer in this area, having published a paper on earthquakes in [Algeria](/source/Algeria) as early as 1848, in the journal *[Mémoires de l'Académie des Sciences, Arts et Belles-Lettres de Dijon](/source/Acad%C3%A9mie_des_Sciences,_Arts_et_Belles-Lettres_de_Dijon)*. He continued to post annual observations on Algerian earthquakes until 1871.[2]

He suspected a correlation between the Moon and seismic activity on Earth, and developed his theory with the use of statistics. He found that Earth tremors occurred most frequently during full and new moons, when the Earth is between the Sun and Moon, when the Moon is between the Earth and Sun, and when the Moon is closest in its orbit to the Earth. He also found indications in some cases that the Moon had crossed the meridian of affected locales at the time of the earthquake.[3]

## References

1. Fréchet, Julien (2008). "Past and Future of Historical Seismicity Studies in France". *Historical Seismology*. *Modern Approaches in Solid Earth Sciences*. **2** (II): 131–145. [doi:10.1007/978-1-4020-8222-1_6](https://doi.org/10.1007/978-1-4020-8222-1_6). ISBN 978-1-4020-8221-4.

1. Benouar, Djillali. ["Materials for the investigation of historical seismicity in Algeria from the records of past earthquakes"](http://www.earth-prints.org/bitstream/2122/780/1/18Benouar.pdf). *Annals of Geophysics*. Vol. 47, N. 2/3, April/June 2004.

1. Velikovsky, Immanuel. Earth in Upheaval, 1955.

## Further reading

- Davison, Charles (1930). ["Chapter IV: Alexis Perrey"](https://books.google.com/books?id=d-08AAAAIAAJ&q=alexis+perrey&pg=PA47). *The Founders of Seismology*. The University Press.

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