Phys. Rev. Lett. 91, 148501 (2003) [4 pages]Electric Fields that “Arrive” before the Time Derivative of the Magnetic Field prior to Major EarthquakesReceived 12 February 2003; published 3 October 2003 The low frequency electric signals (emitted from the focal area when the stress reaches a critical value) that precede major earthquakes, are recorded at distances ≈100 km being accompanied by magnetic field variations. The electric field “arrives” 1 to 2 s before the time derivative of the horizontal magnetic field. An explanation, which is still awaiting, should consider, beyond criticality, the large spatial scale as well as that the transmission of the electromagnetic fields (through an inhomogeneous weakly conductive medium like the Earth) obeys diffusion type equations. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.148501
DOI:
10.1103/PhysRevLett.91.148501
PACS:
91.30.–f, 03.50.De, 05.40.–a, 41.20.–q
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.