In the past 30 years, there has been widespread attention to the impact of local geology, in urban areas, on ground motion during earthquakes. Numerous studies (e.g. Bard, 1999 and Haghshenas et al., 2008 for a literature review) have shown that the seismic amplification observed in sediments can vary significantly, even at small distances, as a result of changes in surface geology. Trinidad and Tobago is prone to earthquakes and, therefore, at significant seismic risk. The Trinidad & Tobago Microzonation Project (TTMP) aims to quantify the seismic hazard for the country by studying the local geology in ten major population centres across the country. We use ambient seismic noise recordings to derive our results. We recorded both single-site measurements, processed using the Horizontal to Vertical Spectral Ratio (HVSR) (Nakamura, 1989), and Microtremor Array Measurements (MAM) (Tokimatsu, 1997) techniques. Simulation of ambient noise, from Hisada’s method and using RANSOURCE code (Moczo et al, 2002), is used as an independent test to strengthen the conclusions from the experimental results (Hisada, 1994, 1995). In the first urban area selected, the capital Port of Spain, more than 1100 single-site and 26 array recordings have been conducted. Results show a gradual deepening of the Port of Spain basin to the south, with significant sediment thickness (~160m). By integrating the results we are also able to derive a soil classification map according to NEHRP soil classification (BSSC, 2003). Shear wave velocity varies from ~160 m/sec in reclaimed land in the south to ~3000 m/sec for the massive Chancellor Schist to the north and Laventille Metalimestone east of the basin. Resonance frequency has a similar variation from south to north ranging between 0.4 to 10 Hz. A local network of strong motion sensors is set to be installed, and define the amplification of sediments within the urban environment.