Abstract
A microgravity survey consisting of 347 stations was conducted in the upstream switchyard of a dam powerplant. The objective of the survey was the detection of subsurface cavities or other anomalous conditions which could threaten the integrity of the switchyard structures. six anomalous areas were identified on the gravity anomaly map and ranked for their interpreted significance. From these results nine boring locations were selected to investigate the cause of the anomalies. This paper presents details of the field survey, data processing, interpretations, and recommended drilling locations for subsurface investigation.
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