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Probabilistic seismic-hazard assessment of the Canary Islands

Luis I. Gonzalez de Vallejo, Julian Garcia-Mayordomo and Juan M. Insua
Probabilistic seismic-hazard assessment of the Canary Islands
Bulletin of the Seismological Society of America (December 2006) 96 (6): 2040-2049

Abstract

This article presents the first probabilistic seismic hazard assessment of the Canary Islands. The Canary Islands form a volcanic archipelago located on the passive margin of the African plate, 100 km off West Africa. Active volcanism has taken place on the islands in historical times, commonly together with the occurrence of volcanic-related seismic sequences, some of them felt as high as I (sub MSK) = X. In 1989 a notorious seismic sequence (m (sub bLg) 5.2) took place along a submarine fault located between the islands of Gran Canaria and Tenerife, clearly representing the occurrence of tectonic seismicity in the archipelago as well. In this article we review the geology and tectonics of the islands as well as recent paleoseismological findings on south Tenerife. We also revise, complete, and decluster the historical and instrumental seismic catalog of the islands. Seismic-hazard analysis is then performed following the standard Cornell (1968) method, defining three seismogenic sources and selecting an appropriate ground-motion attenuation relationship from Hawaiian data. Two hazard maps of the archipelago have been developed for return periods of 475 and 950 yr, as well as hazard curves for the capital cities. Calculated peak ground acceleration values at Santa Cruz de Tenerife and Las Palmas de Gran Canaria are 0.06 and 0.08 g, and 0.05 and 0.07 g, for the 475- and 950-yr return periods, respectively. Finally, we analyze the impact on hazard resulting from uncertainties associated with the seismogenic source model and the ground-motion attenuation relationship.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 96
Serial Issue: 6
Title: Probabilistic seismic-hazard assessment of the Canary Islands
Affiliation: Complutense University of Madrid, Department of Geodynamics, Madrid, Spain
Pages: 2040-2049
Published: 200612
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 48
Accession Number: 2007-010932
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N27°00'00" - N29°00'00", W19°00'00" - W13°00'00"
Secondary Affiliation: Center for Studies and Experimentation on Public Works, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200707
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