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(NAS Colloquium) Earthquake Prediction The Scientific Challenge (1996) / Chapter Skim
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What electrical measurements can say about changes in fault systems
Pages 3776-3780

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From page 3776...
... This is because the long-period electric currents coming from the ocean gradually leak into the mantle, but the lower crust is usually very resistive and very little leakage takes place. If a lower crustal zone is less resistive it will be a leakage zone, and this can be seen because the MT phase will change as the ocean currents leave the upper crust.
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From page 3777...
... which have the earthquake zone between them. To model the phase difference at the longest periods, we had to put a lower crustal leakage zone underneath the fault zone.
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From page 3778...
... 1. ED, Parkfield; x, Tulace Lake; ., Exeter; a, Mineral King; ·, Owens Valley; A, Eureka Valley.
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From page 3779...
... The increase of the conductivity is probably due to a better connectivity of the lower crustal fluids. If this keeps up, there is the possibility that the lower crust will influence the upper crust fault zone fluid pressure, but at this stage we cannot say too much.
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From page 3780...
... U.S. Geological Survey Professional Paper, Special Issue, Loma Prieta, in press.
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Key Terms

  • lower crust
  • lower crustal
  • upper crust
  • slip zone
  • fluid pressure

  • fault zones
  • crustal zone
  • loma prieta
  • crust fault
  • adjacent crust

  • pore pressures
  • leakage zone
  • san andreas
  • rock pressure
  • gradually leak

  • crustal leakage
  • ocean currents
  • free water
  • conductive zones
  • active slip

  • conductive lower
  • telluric measurements
  • andreas fault
  • debate concerning
  • crustal fault

  • zone compared
  • lithostatic pressure
  • time scale
  • surfaces parallel
  • probably due


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