Using a 'stethoscope' to listen for an earthquake

Geophysicist Mark Zoback discusses how instrumentation in a 1.4-mile-deep hole will help analyze the forces behind earthquakes along the San Andreas Fault.

Video: Richard Townsend and Jack Hubbard

• Scientists launch major earthquake drilling project along the San Andreas Fault

• Parkfield Earthquake Experiment

• San Andreas Fault Observatory

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