(Article of periodic en Anglais - 2014)

Document title

Using earthquakes to assess lichen growth rates

Authors(s) and Affiliation(s)

BULL W.B. (1) ;
(1) Geosciences Dept., Univ. of Arizona, Tucson, ETATS-UNIS


Largest lichen measurements on rockfall blocks that accumulate incrementally as hillslope talus in earthquake-prone California plot as distinct peaks in frequency distributions. Rockfall surface-exposure times are known to the day for historical earthquakes and to the year where mass movements damage trees. Lichenometry consistently dates regionally synchronous rockfall events with an accuracy and precision of ±5 years. Only historical records and tree-ring dating of earthquakes are better. The 4 crustose lichens used here have constant long-term growth rates, ranging from 9.5 to 23.1 mm per century. Growth rates do not vary with altitude or climate in a 900 km long mountainous study region in California, USA. Linear growth regressions, when projected to the present, constrain estimates of colonization time and possible styles of initial lichen growth


Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2014, vol. 96, no2 [pp. 117-133]

Bibliographic references : 41 ref.

Collation : 19 fig., 2 tabl.




Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12035

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28681480 : Permanent link - XML version
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