Seismometer
Ground motion, last 6 hours (counts). Spikes are distant earthquakes; the slow wobble is Earth’s tide and local noise.
Seismic Spectrogram
Ground motion power, last 24 hours, 0–5 Hz. Microseism hum near 0.2 Hz, regional events as rising traces.
Telluric E‑Field
Natural electric field in the ground, last 24 hours (mV/km, 135 ft dipole). The daily wave is driven by global thunderstorm activity and ionospheric currents.
Magnetometer
Earth’s magnetic field, last 24 hours (nT). The smooth daily curve is the solar quiet (Sq) variation; storms show as jagged swings.
Schumann Resonance
The Earth‑ionosphere cavity hum, excited by worldwide lightning. Fundamental mode near 8 Hz.