I wish to report that on March 22, 2014 at 13:34 a member of my group and myself experienced an infrasound event with a recorder running. The experience manifested physiologically as a buzzing deep vibration in the abdomen, fear, anxiety, and a strong need to leave the area even though being in the field looking for BF. That seems illogical following the event so perhaps another symptom is confusion. While we recognized the event immediately for what it was, it was not pleasant and probably not intended to be. Initial investigation of the recorder did reveal any significant audio as the frequency of what was experienced was well below the frequency response of the Zoom H2 recorder. But closer examination of the recording with graphics audio analysis software revealed a graphics trace consistent with the experienced frequencies at the appropriate time line.
Preliminary findings:
Infrasound is a physical phenomena that can be detected, recorded and analyzed in the right circumstances.
It appears to be a low frequency pressure wave somehow generated by a bigfoot. Probably vibrations in the airway and lungs. The BF was not visible, behind cover, but the amplitude of the pressure wave was quite powerful. There was no mistaking something was happening.
Although the frequency of the infrasound was below the recording range of the recorder, objects in the pack the recorder was mounted on, seemed to have rattled together at a higher frequency with the passing infrasound pressure waves resulting in a secondary sound that was in the recorders range. By looking at a the recordings graphics trace during the event, the duration of the event and the frequency of the infra sound was measured.
The infrasound seemed to be non directional and surround the victim. I believe that is because the frequencies involved are below the human hearing range so the ears could not determine the direction the sound originated from.
Because of ambient sounds: running water, footsteps, pack noise, the exact number of infrasound blasts cannot be determined but we believe there were at least 6.
One in particular, when the researcher was not moving and there was no background noise, produced the best analysis results. That particular blast lasted 5.22 seconds. It started at 4.22 hz and ramped up in frequency to 10.69 hz at the end of the 5.22 second blast. The average frequency during the 5.22 second blast was 6.7 hz. This was the second and less strong blast experienced by the researchers who stopped walking at the first blast. Several others followed until one researcher started talking to the BF and asked it to stop but give a friendlier sign it was around. The blasts stopped as requested. 8 minutes later I found a 15 inch footprint on the trail ahead of us.
Those frequencies are well below the low frequency range of most field recorders. That explains why zapping or infrasound recordings do not reveal any audio.
The blasts always started at a low frequency in the 4 to 5 hz range and ramp up to a higher frequency. I suspect they are trying to find the frequency that gives the desired result in the victim. The durations are in the 3 to 5 second range. It is of course unknown what the objective was on the part of the BF.
Because of our findings, it is suggested that anyone who has recorded a zapping or infrasound event retain the recording and review it with graphics audio software. When you know what to look for you may have physical evidence even though the sound playback did not have anything you could hear. I will post the graphics trace later so you can see what the event looks like on a graphics trace. When you know what to look for you can find them.
It cannot be determined if the event would have been visible on the recording without objects in the pack rattling together. Because the infrasound pressure waves were so strong, perhaps the recorder might have displayed the passing waves anyway like wind noise. But it will take another recorded event to determine that.
The location of this event was 300 yards from the chest slapping encounter I reported previously. That leads me to believe that there is something in this area that the resident BF wish to protect or drive humans away from.
If you feel fear, dread, anxiety, and a strong desire to leave the area, get your recorder running and avoid making background sounds. You may be able to get the infrasound on recording.
More to follow when I have it. R R