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still be detected even in highly vegetated areas in a volcanic terrain. This approach relies heavily on strained vegetation 
caused by seepage of thermal fluids at surficial levels. 
The results of this study suggest the need to probe the established Hugpa anomaly to the west and Mainit-Mahalo 
anomaly to the NE. The current location of drilling pad C is preferred here to target the former anomaly where deep- 
seated NW-trending faults dissect the western Hugpa crater (Figure 5). However, the next well (site D) should be 
located east of Mt. Cantodoc (~1.5 kilometers east of Mt. Cantodoc) in proximity to the latter anomaly where NE to 
ENE fault sets predominate. These drilling strategies will validate this study's model of an upflow origin within the 
vicinities of Mts. Cabalian, Cantodoc Tamar. 
6 CONCLUSIONS 
This study dealt with the concept of integrating remote sensing and geographic information system. Use of the 
imageries (i.e. Landsat TM and SAR) refined the previous structural interpretations and established its relationships 
with SLGP thermal manifestations. Primary and secondary permeability controls (i.e. hostrocks/lithologic contacts and 
faults) were important factors that influenced the hydrothermal system at SLGP. This study favors the existence of more 
than one geothermal system (i.e. Cabalian, Cantodoc and Tamar system). 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 227