{"id":1,"date":"2025-09-08T03:13:46","date_gmt":"2025-09-08T03:13:46","guid":{"rendered":"http:\/\/gseconsultantstt.com\/?p=1"},"modified":"2025-11-10T18:42:46","modified_gmt":"2025-11-10T18:42:46","slug":"trinidad-tobago-at-risk-the-hidden-threat-of-earthquakes","status":"publish","type":"post","link":"https:\/\/gseconsultantstt.com\/index.php\/2025\/09\/08\/trinidad-tobago-at-risk-the-hidden-threat-of-earthquakes\/","title":{"rendered":"Trinidad & Tobago at Risk: The hidden threat of Earthquakes"},"content":{"rendered":"\n

Trinidad and Tobago straddles the southern Caribbean\u2013South American plate boundary, where oblique convergence and strike-slip motion partition between the Lesser Antilles subduction system to the northeast and crustal faults that cut across Trinidad. The Central Range Fault (CRF)\u2014a steep, dextral strike-slip structure\u2014traverses Trinidad and links kinematically with the El Pilar system in northeastern Venezuela2<\/sup>, forming a major zone of contemporary strain accumulation and release. Regional syntheses and geodetic studies1<\/sup> identify these faults as active elements of a complex boundary in which plate motion is accommodated by both seismic slip and fault creep.<\/p>\n\n\n\n

The historical and instrumental record shows recurrent moderate to strong shaking affecting the country. Notable events include the 22 April 1997 Mw 6.1 Tobago earthquake5,6<\/sup>, which caused structural damage and injuries, and a sequence in October 20138<\/sup> (M 6.1 near Venezuela) felt widely across Trinidad. On 21 August 2018, a Mw 7.3 earthquake off Sucre, Venezuela7<\/sup>, produced long-period shaking that damaged nonstructural elements and disrupted services across Trinidad\u2014an illustration of how large regional events can transmit significant shaking to the islands. <\/p>\n\n\n\n

Probabilistic seismic hazard assessments (PSHA) for the Eastern Caribbean3<\/sup> consistently indicate elevated hazard levels for Trinidad and Tobago relative to many Caribbean islands, reflecting proximity to active crustal faults and the subduction interface. Region-wide PSHA maps (logic-tree based)4<\/sup> and country-scale studies yield peak ground acceleration estimates at return periods relevant to modern codes, while older site-specific work already flagged substantial hazard in Tobago. Current efforts move beyond national maps toward urban microzonation, with recent studies9<\/sup> (e.g., San Fernando) integrating geotechnical data and shear-wave velocity profiles to resolve local amplification. <\/p>\n\n\n\n

Translating hazard into risk depends on exposure and vulnerability of the built environment. Portfolio-scale profiles (e.g., GEM) emphasize concentrations of people and assets along the west and north coasts of Trinidad10<\/sup>, where site conditions (soft sediments, reclaimed or deltaic ground) may amplify shaking; this underpins the case for code enforcement, retrofit of critical facilities, and continuous monitoring. National outreach and technical programs led by the UWI Seismic Research Centre\u2014including seismic microzonation guidance11<\/sup>\u2014provide a framework for mitigation and preparedness that is increasingly aligned with international best practice. <\/p>\n\n\n\n

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  1. Churches, C. J. E., et al. (2019). Fault creep and strain partitioning in Trinidad\u2013Tobago: Geodetic evidence for active dextral motion on the Central Range Fault.<\/strong> Tectonics, 38<\/em>(12), 4330\u20134348.<\/li>\n\n\n\n
  2. Jansma, P. E., et al. (1989\/1990s synthesis cited in) Evolution of the Southern Caribbean Plate Boundary, Vicinity of Trinidad<\/strong>. AAPG Bulletin, 73<\/em>(4), 490\u2013509. <\/li>\n\n\n\n
  3. LaForge, R., et al. (2011). Probabilistic Seismic Hazard Assessment at the Eastern Caribbean Islands<\/strong>. Bulletin of the Seismological Society of America, 101<\/em>(5), 2499\u20132521. <\/li>\n\n\n\n
  4. Lai, C. G., et al. (2018). Probabilistic Seismic Hazard Assessment Study for the Eastern Caribbean Region<\/strong> (report). UWI STA. <\/li>\n\n\n\n
  5. Shepherd and Apsinall (1983). Seismicity and earthquake hazard in Trinidad and Tobago, West Indies.<\/strong> Earthquake Engineering & Structural Dynamics, 11<\/em>(2), 179\u2013192. <\/li>\n\n\n\n
  6. UWI Seismic Research Centre (2010).\u00a0Past, Present and Future Implications for Trinidad & Tobago<\/strong>.<\/li>\n\n\n\n
  7. CCRIF SPC (2018). Event Briefing: West of Trinidad Earthquake, 21 August 2018 (Mw 7.3)<\/strong>.<\/li>\n\n\n\n
  8. Caribbean Journal (2013). Trinidad Shaken by 6.1-Magnitude Earthquake Near Venezuela<\/strong>. <\/li>\n\n\n\n
  9. UWI SRC & Partners (2023). Trinidad and Tobago microzonation project: San Fernando<\/strong>. Geophysical Journal International, 233<\/em>(3), 1727\u20131749 (abstract). <\/li>\n\n\n\n
  10. Global Earthquake Model (GEM) (2024). Trinidad and Tobago seismic risk profile<\/strong>. PreventionWeb. <\/li>\n\n\n\n
  11. UWI Seismic Research Centre (2021). Seismic Microzonation Studies \u2013 FAQ<\/strong>. <\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Trinidad and Tobago straddles the southern Caribbean\u2013South American plate boundary, where oblique convergence and strike-slip motion partition between the Lesser Antilles subduction system to the northeast and crustal faults that cut across Trinidad. The Central Range Fault (CRF)\u2014a steep, dextral strike-slip structure\u2014traverses Trinidad and links kinematically with the El Pilar system in northeastern Venezuela2, forming […]<\/p>\n","protected":false},"author":2,"featured_media":64,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismology"],"_links":{"self":[{"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/posts\/1","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/comments?post=1"}],"version-history":[{"count":8,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/posts\/1\/revisions"}],"predecessor-version":[{"id":136,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/posts\/1\/revisions\/136"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/media\/64"}],"wp:attachment":[{"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/media?parent=1"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/categories?post=1"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gseconsultantstt.com\/index.php\/wp-json\/wp\/v2\/tags?post=1"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}