Hi All. Infrasound has been us for a long time. It has just been recently that it was discovered and understood to a certain extent. Could it be that this is what Petra and others are hearing before the quake occurs?

I know when the two dilational strain meters in San Juan Bautista were working I saw 7 quakes occur in which strain was seen. The only strain meter that showed a strain build up was the “Echo Valley” data site. There would be a build up of strain, it would peak, level off, then drop. This would occur about a day before the quake. However the quakes didn’t occur at the instance of release of strain. In all cases it was hours after the strain had dropped. The M>5.4 quake we had in August of 1998 must have been the straw that broke the camels back as the site was shut down after that.

There was very little to no strain build up seen before the M>6.0 quake in Parkfield last year. I thought this was odd because on two occasions I saw strain build up for two quakes prior to that quake. One was near Middle Mountain and the other was near Hog Canyon Road. A thought occurred to me that maybe the earth between the location of quake and the nearest strain meter is so badly fractured that any strain build up that occurred was absorbed before it reached the strain meters.

It took Petra about a year to get me to understand what she was hearing. Whenever she explained to me I would always tell her I was hearing the same thing all the time, except mine was caused by to many gunshots, to many explosions and to many jet aircraft. She never strangle me although I’m sure the thought came to mind more then once. Take Care…Don in creepy town

“Ultra low pitch earthquake sounds are keenly felt by animals and sensitive humans. Quakes occur in distinct stages. Long before the final breaking release of built up earth tensions, there are numerous and succinct precursory shocks. Deep shocks produce strong infrasonic impulses up to the surface, the result of massive heaving ground strata. Certain animals (fish) actually can hear infrasonic precursors. Precursory shocks are silent, being inaudible in humans. Animals, however, react strongly to the sudden surface assault of infrasonic shocks by attempting escape from the area. Animals cannot locate the source and center of these infrasonic impulses, behaving in a pitiful display of circular frenzies. The careening motion of wild horses and other domestic animals indicates their fear and anxiety. Poor creatures, neither they nor we can escape the infrasonic source. Encounters with natural infrasound reveal their vast extent, covering hundreds of square miles of surface area.”

• Infrasound