Tobago and Earthquakes
Application of Distributed Computing Techniques in earthquake and volcano monitoring
Seismic Hazard Assessment
Strong motion network
Tobago and Earthquakes This is a PhD project registered with The University of the West Indies. Three (3) themes are under investigation:
1. Forecasting of the strongest 1997 earthquake near Tobago using b-value analysis and other indicators – this theme reports on the b-value analysis conducted during the activity of 1997, which led to the projection that a stronger earthquake was imminent; examine the data for other short-term indicators of stronger activity.
2. Projected seismicity near Tobago based on past seismicity near and off to the east of Tobago – this theme examines the entire database of significant earthquakes near, and in the far-field off the east of Tobago, as far as the Vema Fracture Transform, with a view to improving the understanding of the tectonics at work in the generation of earthquakes near Tobago. The possibility of faults being pushed closer to failure by remote earthquakes is becoming of more interest in the seismological community, and this particular chapter is currently being tailored for journal submission at an early date.
3. Hydrological effects of the April 22, 1997 Tobago earthquake – this theme documents, and analyses the groundwater impact of the strongest shock of the 1997 series, by collecting information from government agencies and property owners. A possible model consistent with the observations is used to determine the change in the size of crack apertures, which gave rise to the large volume of observed groundwater discharge.
Principal Investigator: Joan Latchman
Application of Distributed Computing Techniques in earthquake and volcano monitoring This is a PhD project registered at the University of the West Indies. . This research project is primarily concerned with the integration of Information and Telecommunication technology (ITC) into the regional seismic data acquisition/monitoring network. Investigations continued in the following three areas.
1. Use of broadband Internet access technology (Asymmetrical Digital Subscriber Line) and digital radio telemetry (Wireless Ethernet and Spread Spectrum radios) to improve the “last mile” segment of the seismic data communication network.
2. Use of Watchdog Timer and other techniques to improve the availability and reliability of the remote data acquisition/monitoring systems.
3. Development of a middleware software package that is suitable computer-networking infrastructure in the Eastern Caribbean. Two areas of development are being undertaken. The first employs traditional HTTP and FTP methods while the second method uses message queuing techniques. The Indian Ocean tsunami of December 26, 2004 re-stimulated the drive to establish a regional Tsunami Warning System and strengthened the prospects for the establishment of a regional VSAT network to facilitate data and message communication. In anticipation of this we have started to investigate how the regional earthquake and volcano monitoring network infrastructure can be adapted to use satellite communication technology.
Principal Investigator: Lloyd Lynch
Seismic Hazard Assessment Using unclipped broadband recordings of strong earthquakes from three or more stations across the region we are studying ground motion attenuation patterns in order to gain better insights of the best attenuation relationship to use in future seismic hazard assessments. The results of this investigation is also being used to validate the last (2003) revision of regional hazard maps which uses attenuation functions that was selected based on clues derived from recordings of a few strong earthquakes in the Trinidad and Tobago area.
Principal Investigator: Lloyd Lynch