摘要
Alignment of silkworms and fish, observed as seismic anomalous animal behavior (SAAB) prior to the Kobe earthquake, were duplicated in a laboratory by applying a pulsed electric field assuming SAAB as electrophysiological responses to the stimuli of seismic electric signals (SES). The animals became aligned perpendicularly to the field direction since their skeletal muscle had a higher resistivity perpendicular to the field direction than parallel to it. An electromagnetic model of a fault is proposed in which dipolar charges, ± q are generated due to the change of seismic stress, σ (t) . From a mathematical model,d q /d t=-α (d σ /d t) - q/ερ , where α is the charge generation constant like a piezoelectric coefficient, ε , the dielectric constant and ρ , the resistivity of bedrock granite. A fault having a length 2 a and a displacement or rock rupture time τ , during which the stress is changed, gives pulsed dipolar charge surface densities, +q(t, x) and -q(t, x+2a), or an apparent electric dipole moment of P(t)=2aQ(t)=2aAq(t)=αM 0[ερ/(τ-ερ)](e -t/τ -e -t/ερ ) using the earthquake moment M 0. The fault displacement, D , its initial velocity, D′ and the stress drop, Δ σ give τ=D/D′= (Δ σ/σ 0)(α/β) . The field intensity, F , and seismic current density at a fault zone, J were calculated as F=q/ε and J=F/ρ′ using ρ′ of water as to give J=0.1～1 A/m 2 sufficient to cause SAAB experimentally. The near field ultra low frequency (ULF) waves generated by P(t) give SES reciprocally proportional to the distance R .
Alignment of silkworms and fish, observed as seismic anomalous animal behavior (SAAB) prior to the Kobe earthquake, were duplicated in a laboratory by applying a pulsed electric field assuming SAAB as electrophysiological responses to the stimuli of seismic electric signals (SES). The animals became aligned perpendicularly to the field direction since their skeletal muscle had a higher resistivity perpendicular to the field direction than parallel to it. An electromagnetic model of a fault is proposed in which dipolar charges, ± q are generated due to the change of seismic stress, σ (t) . From a mathematical model,d q /d t=-α (d σ /d t) - q/ερ , where α is the charge generation constant like a piezoelectric coefficient, ε , the dielectric constant and ρ , the resistivity of bedrock granite. A fault having a length 2 a and a displacement or rock rupture time τ , during which the stress is changed, gives pulsed dipolar charge surface densities, +q(t, x) and -q(t, x+2a), or an apparent electric dipole moment of P(t)=2aQ(t)=2aAq(t)=αM 0[ερ/(τ-ερ)](e -t/τ -e -t/ερ ) using the earthquake moment M 0. The fault displacement, D , its initial velocity, D′ and the stress drop, Δ σ give τ=D/D′= (Δ σ/σ 0)(α/β) . The field intensity, F , and seismic current density at a fault zone, J were calculated as F=q/ε and J=F/ρ′ using ρ′ of water as to give J=0.1～1 A/m 2 sufficient to cause SAAB experimentally. The near field ultra low frequency (ULF) waves generated by P(t) give SES reciprocally proportional to the distance R .
