Woodside Energy this week announced it would start seismic testing for its Scarborough gas project off Australia's west coast, before reversing the decision in the face of a legal challenge from Traditional Owners.
The sound can penetrate more than 10 kilometers into the earth beneath the seafloor. The way the signals reflect off different layers of the seabed can identify geological structures, including those that contain mineral deposits such as oil and gas. The sound signals bounce back to acoustic receivers towed behind the survey vessel on cables known as streamers.
During a survey, sound signals are generated every four to ten seconds, 24 hours a day, seven days a week. Surveys can last for weeks or months, and cover thousands of square kilometers of ocean. The proposal to study the Otway Basin, for example, covers 45,000 square km.The Australian Marine Conservation Society wants to stop seismic surveys.
The ability to fully examine the effects of seismic surveys in mammals is limited, because invasive methods are not logistically possible or ethically acceptable.
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