thank goodness that's over
Mar. 24th, 2011 01:04 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
keladry_lupinA local petroleum company and a research team have been doing a geophysical survey of Long Beach over the last few months, and they went down the street behind mine today. I wish I'd had more notice so I could have seen it, because I read the pamphlet that was left on my door this morning and found it quite interesting.
The effects were terribly unsettling, though. Low-frequency sound waves are sent down into the ground by a huge truck, and they bounce back into sensors that have been placed on the surface of the ground. I couldn't hear the sounds, but I could feel the heavy THRUM when the sound goes out from the truck they're using. It's like an earthquake, but not really, because the ground isn't moving, but I was as freaked out as if it was. I only heard the faintest rumbles (the human ear can't hear below 15-20 Hz), but the lower frequencies must have been very loud because it rattled through my body, and my ears were ringing. It's creepy! The cats got very needy for the twenty minutes the survey lasted; they didn't like this any more than I did.
Thank goodness it only lasted twenty minutes.
The effects were terribly unsettling, though. Low-frequency sound waves are sent down into the ground by a huge truck, and they bounce back into sensors that have been placed on the surface of the ground. I couldn't hear the sounds, but I could feel the heavy THRUM when the sound goes out from the truck they're using. It's like an earthquake, but not really, because the ground isn't moving, but I was as freaked out as if it was. I only heard the faintest rumbles (the human ear can't hear below 15-20 Hz), but the lower frequencies must have been very loud because it rattled through my body, and my ears were ringing. It's creepy! The cats got very needy for the twenty minutes the survey lasted; they didn't like this any more than I did.
Thank goodness it only lasted twenty minutes.