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Barend Erasmus

As seen in: The Conversation, AllAfrica, Daily Maverick
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Articles

OFFSHORE EXPLORATION: Planned seismic survey by Shell has kicked up a storm in South Africa. Here’s an explainer

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By Mia Wege, Barend Erasmus, Christel Dorothee Hansen, Els Vermeulen
| Daily Maverick Verified
What is a seismic survey? Seismic surveys have been used for at least 50 years in both onshore and offshore mineral and oil exploration. The concept is relatively simple: measure the time it takes for a compression wave (“sound”) to move through solid material, strike a reflecting surface and return to a recorder. This allows the orientation and thickness of layers hidden below the Earth’s surface to be measured, so hidden ore deposits and gas or oil trap structures can be identified.
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Planned seismic survey by Shell has kicked up a storm in South Africa. Here's an explainer

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By Mia Wege, Barend Erasmus, Christel Dorothee Hansen, Els Vermeulen, James Roberts, Jean Purdon, Michael John Somers
| The Conversation Verified
The planned seismic survey off South Africa’s Wild Coast by energy company Shell has unleashed public outrage in the country and beyond. The survey’s aim is to search for oil and gas deposits. Environmental and human rights organisations and fishing communities are trying to block the move in court. The Conversation Africa asked researchers to share their insights on seismic surveys. What is a seismic survey?
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