PHIL GREEN / SCIENCE PHOTO LIBRARY PHIL GREEN / SCIENCE PHOTO LIBRARY
Diagram of Parkfield earthquake prediction exper- iment, showing instrumentation: 1) seismometer in hole to record microquakes; 2) magnetometer to record magnetic field; 3) near-surface seismometer to record larger shocks; 4) VIBREOSIS truck that creates shear waves to probe the earthquake zone; 5) creepmeter to record surface movement; 6) strainmeter to monitor surface deformation; 7) sensors in water well to monitor groundwater level; 8) satellite relaying data to US Geological Survey; 9) laser to measure surface movement by bouncing beams on reflectors (10). Arrows show crustal plates movements along San Andreas fault.
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