L015 Perth Basin seismic reflection traverse at Gingin, WA, 1955

A seismic reflection traverse was surveyed across the Perth Basin through the township of Gingin. The traverse was planned to give information on the thickness of the sedimentary section, the structure of the Basin, and the aplicability of the seismic method as a tool for both regional and detailed investigation.The traverse was chosen to cross a major negative gravity anomaly (-110 milligals at Gingin) and to cross theso-called "Hill River Fault". A considerable thickness of section was indicated (in excess of 17,000 feet) and tectonic structure, not apparent in the surface geology, was shown. A deep-seated anticline, the Gingin anticline, was discovered.

本次完成了一条横穿珀斯盆地（Perth Basin）、途经吉金镇区的地震反射测线（seismic reflection traverse）勘探作业。本次测线的布设目标为获取沉积剖面厚度、盆地构造特征，以及地震方法作为区域与精细勘探工具的适用性相关数据。该测线被选定为穿越一处大型负重力异常（吉金镇区处为-110毫伽）与所谓的“希尔河断层（Hill River Fault）”。勘探结果显示，剖面厚度可观（超过17000英尺），同时揭示了地表地质中未显现的构造特征。本次勘探还发现了一处深部背斜构造——吉金背斜（Gingin anticline）。