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Item Seismograph stations in Trinidad and Tobago and the Commonwealth Caribbean(2010-09-26T17:29:23Z) Seismic Research CentreThis report provides a list of all stations which have operated in the region of Trinidad and Tobago and the Commonwealth Caribbean. These stations are all under the control of the Seismic Research Centre and all seismograms recorded since 1952 are archived at the Centre. Additional stations are operated in the French Antilles by the Institute de Physique du Globe.Item Seismic intensity survey in Tobago for three felt events(2010-09-26T17:08:49Z) Rogers, Ingrid; Latchman, JoanThree earthquakes were felt in Tobago on May 24 1882. Subsequently, an intensity survey was conducted to assertain the extent of the damage that followed.Item A report on earthquake activity in the Antigua / Barbuda region July 1980 - October 1983(2010-09-26T16:45:50Z) Beckles, David M.; Shepherd, John B.This report responds to requests from government and regional agencies on erthquake activity in the Antigua/Barbuda region during the period; July 1980 - October 1983.Item Estimating earthquake risk in Jamaica(2010-09-26T16:24:02Z) Shepherd, John B.; Aspinall, W. P.A review of the history of earthquake observations in Jamaica is presented and the observed seismicity of the Jamaica region is discussed in the context of regional tectonics.Item Geological services in the Lesser Antilies(2010-09-26T15:47:44Z) Tomblin, JohnThis paper outlines the Geological services available in the Caribbean with special emphasis on the services offered by the Seismic Research Unit.Item On the use of the Omega navigational system as a high quality time reference for seismological studies(2010-09-26T15:17:42Z) Aspinall, W. P.The use of the Omega low frequency navigational system as it relates to seismological studies is explained.Item West Indian volcanic eruptions and the hazard to human populations(2010-08-13T19:39:16Z) Tomblin, J. F.This paper describes the types of volcanic activity which represents a hazard to human populations in the West Indies. Particular attention is paid to the most dangerous type of activity; the pyroclast flow. Alternative called the glowing avalanche or nuee ardente eruption. Attention wil be paid to the signs connected to this type of eruption and destructive damage resulting from it.Item Amphibole-bearing Basalts from the submarine volcano Kick'em-Jenny in the Lesser Antilles island arc(2010-08-13T17:43:04Z) Sigurdsson, Haraldur; Shepherd, JohnThis paper describes the occurrence of amphibole megacrysts in olivine basalt pyroclast deposits. It also discusses the geology and petrology of the active Kick'em-Jenny submarine volcano in the Southern Grenadines of the Lesser Antilles island Arc.Item Geological report on the St. John landslip, Grenada(2010-08-07T21:37:42Z) Sigurdsson, HaraldurInvestigation into the landslip of the St. John area of Grenada. Also,accompanying recommendations regarding further monitoring and disaster prevention is examined.Item Tectonic and structural controls of magma genesis in the Lesser Antilles(2010-08-07T21:01:05Z) Tomblin, John F.This paper reviews the structure, major elements of geochemistry and present-day tectonics of the Lesser Antilles. It attempts to relate the various observations to one another and to the broader picture of global tectonics in the Atlantic-Caribbean region.Item Prospects for the development of geological natural resources in the Lesser Antilles(2010-08-07T21:00:34Z) Tomblin, John; Tomblin, JudithThis paper presents an abstract of a special report of the Commonwealth Geological Liaison Office. It reviews research and exploitation which has been carried out on geological natural resources in the Lesser Antilles.Item Earthquake microzonation and prediction in the West Indies(2010-08-07T20:59:32Z) Tomblin, JohnThis paper reviews the work carried out todate on earthquake microzonation and prediction.Item An outline of the geology of Trinidad(12/07/2010) Barr, K. W.; Saunders, J. B.This outline was presented to set the scene of the Fourth Caribbean Geological conference. It provides a background to the field excursions which will follow the technical sessions. Trinidad lies on the mobile northern side of the eastern Venezuela basin and was characterized, by intermittent tectonic activity which interrupted and modified the sedimentation. As a result, several local facies were developed which have no direct counterparts in eastern Venezuela.Item Earthquakes and Volcanoes(2010-06-28T15:03:05Z) Seismic Research CentreThis publication focuses on earthquakes and volcanoes. The processes involved in their generation are reviewed and a number of precautionary measures which should be taken before, during and after an earthqquake are outlined. Some short notes on a number of large historical events are also itemised and a glossary of termss appended.Item Socio-economic and political constraints on disaster preparedness in the Eastern Caribbean(2010-06-21T15:51:58Z) Rowley, KeithAfter centuries of political and social development, the proliferation of independent and semi-autonomous states, a large number of isolated decision-making centres, in the form of island goverments have emerged in the Caribbean region. These governments zealously guard their autonomy and sovereignty. A situation which poses serious considerations with respect to the management of natural hazards such as volcanic eruptions and earthquakes. Also, most of the island economies are heavily dependent on agriculture and tourism, which are extremely susceptible to the disruptions which occur during a volcanic eruption, an earthquake and aftershocks. These natural hazards provide little time for rehearsing during actual events, therefore, it is imperative that socio-economic and scientific studies be carried out in anticipation of major hazards. These studies would then produce contingency plans for dealing with such hazards. The political initiatives required to implement and advance plans relating to disaster preparedness cannot proceed satisfactorily without such studies.Item An earthquake location programe for a hand-held calculator(2010-06-21T15:21:10Z) Shepherd, John B.This report describes the possibility of loading a complete hypocentre location programme on to a hand-held calculator.The HP-41CV calculator is described.Item Seismicity and plate tectonics of the Eastern Caribbean(2010-06-21T14:33:06Z) Tomblin, J. F.The distribution of earthquakes in the Caribbean region closely follows the Greater and Lesser Antillean island chain and the coast of Venezuela. This zone is interpreted as one of differential movement between two separate plates of lithosphere, the first beneath the Caribbean sea, i,e. enclosed by tectonic belt, and the second including the American continents and the western half of the Atlantic ocean.Item Cada Q in the eastern Caribbean, West Indies(Geophysical Journal International (1993) Volume 112, issue #3 pages 507-516, 2010-06-21T14:17:40Z) Ambeh, W.B.; Lynch, L.L.Coda Q, Qc, has been estimated from seismograms of local earthquakes recorded on short-period seismographs on some of the eastern Caribbean islands of the Lesser Antilles arc, West Indies, using the S-S single-scattering model. The region was subdivided into four distinct subregions in order to investigate lateral variations in Qc. the Qc values exhibit a strong frequency dependence in the frequency band 1.5 to 16 Hz, with calculated coda Q at 1 Hz, Q0, ranging from a minimum of 97 in the Dominica area to a maximum of 145 in the Leewards. The degree of frequency dependence is also largest in the Dominica area (n= 1.09) and smallest in the Leewards (n= 0.82). Although there appears to be some lateral and depth variation of both Q0 and n in the region, this variation does not seem to be very significant.