About a kilometer from our house there is a railway line, along which trains pass every half hour. How do I know about this? Very low-frequency “thunderous” peals with the addition of infrasounds are well listened to. And it occurred to me that these trains were going too “loud”, there was probably some kind of resonator that amplifies these rumblings at the lower limit of audibility with the transition to infrasound.

What is this resonator?

Possibly, there is a huge karst cave located under the city, a cavern in the earth’s crust, close to the surface, and it serves as a resonator.

And this means that at one far from happiness moment, the entire city of New Haven, Connecticut, may suddenly fall into this hollow cave of crust!

I think geologists should check this assumption and, if it is correct, fill the cavity with at least water or a clay solution used in oil production in order to ensure its stability for at least decades (if, of course, it has walls INSOLUBLE in water. If it is a salt, limestone, gypsum, dolomite (water-soluble) cavity, then it is necessary, on the contrary, to somehow isolate it from groundwater. Maybe concrete supports should be made through the boreholes?

After all, Venice for centures stands on millions of piles driven into the bottom of the Venetian lagoon…

Faciant meliora potentes.

26 VI 2026

P.S. An interesting observation of an experiment set up by nature to confirm my hypothesis about the presence of a karst cave under New Haven, or at least under the area where the houses are located, in one of which I live.

By the way, it’s strange, but it’s a fact: It’s not the first time that Nature has “helped” me, “BY SETTING UP an EXPERIMENT HERSELF,” which is simply impossible for me!)

After heavy rains (after a couple of days), the rumble of a passing train became noticeably QUIETER!!!

RESONANCE!

The empty cave reverberated into resonance with a low frequency of sound (on the verge of INFRASOUND)! That is, it was a good resonator, such as a special body of violin, cello, double bass, guitar, etc.

When rainwater began to fill part of the cave, its resonant frequency INCREASED, and no longer coincided with the low-frequency vibrations of the soil caused by the passage of a train over it.

(As in a bottle or glass partially filled with water).

Therefore, the rumble has weakened quite noticeably!

This, by the way, explains the very fact of the appearance of the hypothesis of a karst cave. There was a rather long dry period in our area, the grass turned yellow everywhere, even the bushes, whose root system is much more developed and reaches greater depths than that of the grass, also drooped with leaves and young branches.

DEHYDRATION!

So the resonating cavity of the karst cave sounded at full force, which did not even occur to me, because there was no strong resonance!

9 VII 2026

.P.S. After several rainy days, the passage of trains stopped being heard at all!

It seems that wet soil should conduct sound waves and vibrations from the passage of heavy vehicles much better than dry soil and excite strong vibrations of the walls of the resonator.

But the “resonator” itself is filled “up to the throat” with water! And this water has yet to drain through internal channels and gaps into lower-lying caves, caverns in limestones or dolomites.

This once again confirms the hypothesis expressed above about a karst cave near the surface, which plays the role of a resonator – amplifier of low-frequency vibrations of the soil caused by the rapid movement of trains.

31 VII 2026