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

Figure 5

Summary of the palaeostress analysis results calculated per stage. Top row shows the stereographic projections of faults per stage with their corresponding slickenlines. Hollow symbols indicate a component of reverse sense of motion. Cyan stars represent poles of the tensile fractures. The stage 2a and stage 2b results are from the data which have been weighted by both the fault thickness and length. The smaller compression arrows in stage 2a and 2b suggest that the event is mainly extensional, and thus, the magnitude of compression may be minimal. The question mark in the regional present-day direction indicates that only the maximum compression direction is given in the cited study. The smaller arrows are thus assumed.