Calder, E. S.; Cortes, J. A.; Palma, J. L. and Luckett, R.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1029/2005GL023594|
|Google Scholar:||Look up in Google Scholar|
A probabilistic analysis of rockfalls has been undertaken using seismometer- determined information on the timing and duration of rockfalls from the Soufrière Hills lava dome, Montserrat, between 1995 and 1997. Repose intervals between rockfalls fit log logistic survivor distributions. Differences in the log logistic survivor function for different sub-sets of data are accommodated by variation of the parameter k, which varies from 0.7 to 1.6, and sample median, μ. When extrusion rate is assumed to be approximate to 0 m3/s, k is ≤1 denoting that the hazard function has a continuously decreasing form, contrasting to the hazard maximum present during periods of extrusion. This analysis illustrates a direct relationship between k, mu, and lava extrusion rate. Extrusion rate becomes increasingly significant in determining rockfall frequencies when rates are relatively high, whereas other factors become increasingly significant when rates are low.
|Item Type:||Journal Article|
|Copyright Holders:||2005 the American Geophysical Union|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Colin Smith|
|Date Deposited:||14 Sep 2009 15:34|
|Last Modified:||15 Jan 2016 11:48|
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