California Earthquakes Disrupted HF Propagation on West Coast
>RF Seismograph showed an increase in noise on 80 meters some 13 hours beforehand, as well as some propagation changes on 40 and 30 meters — low before the quake and increasing in its wake.<p>Hours. Hours beforehand. Having that much preparation would be life-saving. Especially for us living near the Cascadia Subduction Zone.