STRESS
TIME
SEISMOLOGY · THE HIDDEN VARIABLE IS RUPTURE VELOCITY
FAULT A
FAULT B
σ*
v_r = 0.4 · V_s
SLOW
v_r = 0.95 · V_s
FAST
GROUND MOTION
GROUND MOTION
M ∝ μ · A · Δu · (dv_r/dt) ← acceleration of rupture front, not stored σ
T
T
T
A₃
A₂
A₁
TILT TO SEPARATE · LOOK STRAIGHT TO CONFUSE
HOROLOGY · THE HIDDEN VARIABLE IS CYCLOIDAL CONSTRAINT
θ₁≈10°
θ₂≈30°
θ₃≈60°
T/2
T
3T/2
2T
5T/2
T = 2π√(L/g)
no amplitude term
cycloidal
constraint
self-corrects
via physics
T ∝ √(L/g) ← oscillator physics eliminates A; system self-corrects without tolerance
ISOCHRONY
tilt screen or move head to separate planes · straight on collapses all into confusion