Research Article

Tectonic Evolution of the Southern Negros Geothermal Field and Implications for the Development of Fractured Geothermal Systems

Table 2

Palaeostress inversion results of all the fracture sets by fracturing events. Data were weighted based on the thickness of the deformation zone alone or together with the length of the lineament to minimise biases due to poor field exposures.

StageWeighting parameterNumber of dataTrend (plunge) of the principal axes, degreeShape factor, Mean slip misfit angle, degree

Stage 1N/A5243 (6)138 (66)336 (23)0.3118
Stage 2aThickness57314 (82)185 (5)95 (6)0.4428
Stage 2aThickness & length57269 (87)1 (0)91 (3)0.4837
Stage 2bThickness11269 (55)153 (17)53 (29)0.7124
Stage 2bThickness & length11275 (54)155 (20)54 (29)0.7223