Electromagnetic Fault for Earthquake Lightning.

  • Ikeya Motoji
    Department of Earth and Space Science, Faculty of Science, Osaka University, 1–1 Machikaneyama, Osaka 560, Japan
  • Takaki Shunji
    Department of Earth and Space Science, Faculty of Science, Osaka University, 1–1 Machikaneyama, Osaka 560, Japan

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抄録

A density of bound charges, q, which cancel piezoelectric polarization, appears at a fault zone upon the disappearance of piezoelectricity due to the release of seismic stress, σ . q is described as dq/ dt=-α dσ / dt-q/ε ρ, where α, ε and ρ are the piezoelectric coefficient, the dielectric constant and the resistivity of the earth, respectively. A model of a fault with length 2a and displacement time τ gives q=[α σ 0ε ρ τ (β /a)/(τ -ε ρ )]( e-t/τ- e-t/ε ρ) using the velocity of s-waves, β and the stress along the fault plane, σ 0. The intensity of earthquake lightning (EQL) and its spatial distribution are calculated based on the excitation of molecules by electrons accelerated under an electric field using the assumed q, taking atmospheric polarization into account.

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