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geophysical prospecting
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Diagram showing seismic exploration for petroleum, with a blast generating shock waves that travel through layers of clay, shale, sandstone, and limestone. Reflected waves are detected by sensors on the surface, with data sent to a recording truck and film record. Subsurface layers include gas, oil, and salt water.
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geophysical prospecting

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Diagram showing seismic exploration for petroleum, with a blast generating shock waves that travel through layers of clay, shale, sandstone, and limestone. Reflected waves are detected by sensors on the surface, with data sent to a recording truck and film record. Subsurface layers include gas, oil, and salt water.
seismic exploration Geophysicists searching for oil by using seismic equipment. Sound impulses are put into the ground, and the echoes are recorded to image the subsurface rock layers and find petroleum traps.

Geophysical prospecting is the search for economically valuable mineral deposits by measuring the physical properties of the Earth's materials. These properties include reflectivity, magnetism, gravity, acoustic waves, radioactivity, electricity, and electromagnetism. Geophysical techniques are used to detect anomalies, which are differences between observed measurements and expected values, that may indicate the presence of mineral deposits.123

These methods can be applied from the surface, from aircraft or satellites, or underground in boreholes. Different geophysical methods are chosen based on what is being sought, and often a combination of methods provides the clearest picture. For example, gravity and magnetic surveys help identify potential oil and gas formations by measuring variations in gravitational force and Earth's magnetic field caused by different rock densities and magnetic properties. Direct sampling through boreholes is often necessary to confirm the presence and quantity of discovered materials.345

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5 Britannica Sources
  1. Earth exploration - Excavation, boring, and sampling
  2. coal mining - Geophysical exploration
  3. prospecting
  4. petroleum production - Gravity and magnetic surveys
  5. mining - Prospecting

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