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Probabilistic seismic hazard assessment at the eastern Caribbean Islands

Francesca Bozzoni, Mirko Corigliano, Carlo G. Lai, Walter Salazar, Laura Scandella, Elisa Zuccolo, Joan Latchman, Lloyd Lynch and Richard Robertson
Probabilistic seismic hazard assessment at the eastern Caribbean Islands
Bulletin of the Seismological Society of America (October 2011) 101 (5): 2499-2521


A probabilistic seismic hazard analysis has been performed to compute probabilistic seismic hazard maps for the eastern Caribbean region (10 degrees N-19 degrees N, 59 degrees W-64 degrees W), which includes in the north the Leeward Islands (from Anguilla to Dominica) and in the south the Windward Islands (from Martinique to Grenada), Barbados, Trinidad, and Tobago. The analysis has been conducted using a standard logic-tree approach that allowed systematically taking into account the model-based (i.e., epistemic) uncertainty and its influence on the computed ground motion parameters. Hazard computations have been performed using a grid of sites with a space resolution of 0.025 degrees covering the territory of the considered islands. Two different computation methodologies have been adopted: the standard Cornell-McGuire approach (Cornell, 1968; McGuire, 1976), based on the definition of appropriate seismogenic zones (SZ), and the zone-free approach developed by Woo (1996), which overcomes the ambiguities related to the definition of seismic sources. The interplay and complexities between shallow crustal, intraplate, and interface subduction seismicity of the Caribbean region have been thoroughly investigated. By merging all available databases, a comprehensive and updated earthquake catalog for the region has been compiled. Also, a thorough investigation has been undertaken to identify the most suitable ground motion prediction equations to be used in the analyses. Uniform hazard spectra have been calculated for the horizontal component of ground motion (rock and level site conditions), 4 return periods (RP) (95-, 475-, 975-, and 2475-yr), and 22 spectral accelerations (SA) with structural periods ranging from 0 to 3 s. SAs at 0.2 and 1.0 s for 2475-yr RP have been calculated to allow the definition of seismic hazard in the region of study according to the International Building Code (IBC, International Code Council [ICC], 2009).

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 101
Serial Issue: 5
Title: Probabilistic seismic hazard assessment at the eastern Caribbean Islands
Affiliation: European Centre for Training and Research in Earthquake Engineering, Pavia, Italy
Pages: 2499-2521
Published: 201110
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 75
Accession Number: 2011-103257
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables, geol. sketch maps
N14°22'00" - N14°49'60", W61°19'60" - W60°55'00"
N11°15'00" - N11°15'00", W60°40'00" - W60°40'00"
N10°01'60" - N10°50'60", W61°55'60" - W60°52'60"
N12°00'00" - N12°13'60", W61°47'60" - W61°36'00"
N18°13'00" - N18°13'00", W63°02'60" - W63°02'60"
N13°00'00" - N13°19'60", W59°45'00" - W59°19'60"
N15°11'60" - N15°37'60", W61°30'00" - W61°15'00"
Secondary Affiliation: University of the West Indies, TTO, Trinidad and Tobago
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: 201152
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