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Paleoliquefaction features on Tenerife (Canary Islands) in Holocene sand deposits

González de Vallejo, Luis I. and Tsige Aga, Meaza and Cabrera Pérez, Luis (2005) Paleoliquefaction features on Tenerife (Canary Islands) in Holocene sand deposits. Engineering geology, 76 . pp. 179-190. ISSN 0013-7952

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Abstract

On Tenerife, one of the Canary Islands, a series of clastic dikes and tubular vents is attributed to liquefaction of sediments
during a high-intensity paleoearthquake. Geotechnical, geological, tectonic, and mineralogical investigations have been carried
out to identify the soil composition and structure, as well as the geological processes operating in the area. Geochronological
analysis has indicated an age ranging from 10,081F933 to 3490F473 years BP for the liquefaction features. The area in which
these liquefaction features are found has undergone tectonic uplift and is affected by two faults. One of these faults was
responsible for displacing the Holocene materials. The paleoearthquake responsible for this liquefaction has been analysed in
terms of its peak ground acceleration (pga) and magnitude by back calculation analysis based on the cyclic stress and Ishihara
methods. A range of 0.22–0.35g was obtained for the pga, with the value of 0.30g being selected as most representative. From
this, an earthquake-modified Mercalli intensity of IMM = IX was estimated for the liquefaction site. The magnitude-bound
method and energy-based approaches were used to determine the magnitude of the paleoearthquake, providing a moment
magnitude M in the range of 6.4–7.2; M = 6.8 is taken as the representative figure.


Item Type:Article
Uncontrolled Keywords:Tenerife; Canary Islands; Paleoliquefaction; Paleosismicity; Seismites
Subjects:Sciences > Geology > Geodynamics
ID Code:15520
Deposited On:06 Jun 2012 11:45
Last Modified:06 Jun 2012 11:45

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