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Crossing desert areas in the southwest during an expedition Egypt, British physicist R. A. Begnold and his associate became witnesses to a strange and frightening phenomenon. “Reigned over the desert silence of the night, and suddenly a vibrating rumble broke the silence, so loud that we had to scream to hear each other. Soon new tones were added to the main sound, similar to him in height; we clearly felt faint rhythmic shocks under legs. The mysterious choir went on a rampage for at least five minutes, after whereby the earthquake ceased and triumphed again silence. “The phenomenon of rhythmic hum is just one of the unusual sound natural phenomena. Singing, barking, laughing, creaking and whistling sands are mentioned in recent travelers’ stories fifteen centuries. The earliest descriptions of such effects are found in the annals of the Near and Far East. Marco Polo in the Middle Ages described a similar phenomenon that happened in the Gobi desert, and in the XIX century Charles Darwin observed this phenomenon in Chile. 17th Century Report of Tong Huanlun Manuscript at the British Museum a description of a rumbling dune whose unusual properties are traditionally used as the climax of the festival in The hotien oasis city (Kotan) in northwestern China. In Kotan there is A sand hill that makes sounds at specific times. That’s what written in the report: “The hill stretched for 80 li (40 kilometers) with east to west and 40 li (20 kilometers) from north to south, and in height reaches 150 meters. The whole mountain consists entirely of sand. IN in the midst of summer, this mass begins to make sounds in itself, so and in cases where people or horses walk along the hill, moreover, noise heard at a distance of five kilometers. During the festival people march to the top of the hill, because of which the sand emits loud rumbling sounds resembling peals of thunder. “Related Software the researcher A.D. Lewis observed the phenomenon in 1935 in South African Kalahari Desert. This is how he described the rattling dune: “If you slowly move down the slope on your own buttocks, a very loud rumble is heard. When the natives roll down the dune thus, in the morning or evening silence the sounds are carried at a distance of up to 600 meters and resemble distant peals thunder. “What makes the sands rustle? It’s known that prolonged movement of sand inside the dune – for natural reasons or as a result of external exposure – leads to low frequency vibrations. Sounds like buzzing by ear – something like organ sounds or double bass. And in the presence of overtones sounds more reminiscent of the roar of distant thunder, buzzing bumblebees or low flying aircraft. Seismic waves accompanying this noise were recorded and recorded with using sensitive instruments. Anyway, we are far from full understanding of the true mechanism of occurrence of such vibrations. They could be the result of weak electric discharges. There is an assumption that humming is generated by vibrations individual grains caught between the rolling masses of sand. Some people think that the key to the solution is fit sand grains to each other. Windy and arid climate – The main condition for the occurrence of humming sands. This fact suggested that humming sands should be wide common in the waterless deserts of Mars, over the endless open spaces dominated by constant strong winds. Deaf hooting explosions sand dunes are mostly remote regions where the constant technological noise of our century. Acoustic phenomena found in areas with more by a dense population, it is often very difficult to identify, i.e. distinguish from noise generated by human activity. So, apparently the case with the sounds of distant explosions that heard in the Atlantic Ocean along the entire coast of Europe, and at a considerable distance from the coast – up to Iceland. So called “the deaf hoot of explosions” is also noted offshore North America and Asia. The most famous among such phenomena became “Barisal volleys” – a phenomenon noted in the city of Barisal (Bangladesh) and so named in connection with the nature of the sounds. That’s what wrote G. B. Scott in the journal “Natural” in 1896: “For the first time I heard the barisals volleys in december 1891 when traveling from Calcutta to Assam. It was clear and warm weather without any signs of a storm. All day the noise of the steamer drowned out the rest sounds but with the onset of night … Among the silence was heard only the splash of water and the noise of clods of earth falling from the washed shore. And then muffled explosions were heard, as if a cannon was firing. Some shots sounded clearly quieter and it seemed that between the two armies, located at a fair distance from each other, marched artillery firefight, and the sounds of battle were heard from somewhere in the south, that is, from the side of the sea. “Assumptions designed to explain the nature of the “Barisal salvo” are numerous and varied. Perhaps the “volleys” are the result of large explosions bubbles of methane rising from the bottom of the ocean. They could have been called seismic activity of the ocean bed – however, oddly enough, no connection between mysterious explosions and seismograph records could not be found. A similar effect could be caused by acoustic impact arising from the passage of meteorites through the atmosphere with supersonic speed. In short, there are no comprehensive explanations exists, and therefore this phenomenon remained among those misunderstood natural phenomena that they try to ignore. Persistent examples of a different attitude towards natural phenomena search for a quick explanation of a series of mysterious explosions in the eastern North American coast in 1977. From New Jersey and South Carolina (USA) and Nova Scotia (Canada) received reports of mysterious thunder peals similar to the roar of explosions. Mrs Hatti Perry of Barringgon (Nova Scotia, Canada), Having studied materials about this phenomenon, it describes the events: “Some argue that this sound is akin to a car hit about the wall of the house. It seemed to others that a missile had hit the roof. One woman lying in bed was horrified when, at the time of this hitting the ceiling slab above her head suddenly parted and then again closed. “Explosions were reported sensitive seismic equipment geological observatory columbia University, New York, and their power was equivalent an explosion of fifty to one hundred tons of trinitrotoluene. So what are these explosions caused? One explanation was that he suddenly started explode methane filling the voids under the shelf and coastal strip of sushi. Another relied on the ability to overcome sound The Concorde barrier in this area of the North American coast. Yes, the explosions did not coincide in time with the passage of the Concordes. But in in conditions of extremely cold weather prevailing at that time, possibly the shock wave that arose when overcoming the sound the barrier, spreading, was reflected from the boundary formed in atmosphere, the difference in density of cold and warm air masses. A reflected sound wave could reach the coast – naturally, much time after the passage of the Concord. Third assumption based on the assumption that a shock wave was formed during overcoming the sound barrier during unscheduled flights military aircraft. Only a few scientists were willing to support methane theory, and the Pentagon immediately refuted the military version flying at supersonic speeds in that period of time. Remained suggest that the culprit was still the Concorde. Canadian the government took the problem seriously enough and demanded that the British and French leadership change Concorde route: aircraft of this type were required to stay at least 32 kilometers from the Canadian coast. IN as a result, since February 17, 1978, the Concorde pilots had prescribed to keep at least 80 kilometers from Canadian coast. However, reports of explosions that rang out in Nova Scotia stubbornly continued to do so. What to do? Of course, you can return to the version of military exercises involving supersonic aircraft. However, the Navy Research Laboratory United States involved in the study of the United States Government strange phenomenon does not share this point of view. At this stage we can only agree with the opinion of Ernest Jan, a scientist from National Aerial Phenomenon Research Committee who said: “This is a form of physical phenomena that we simply incomprehensible. “Wrath of the gods? Inhabitants of a small town East Hadzarn (Connecticut, USA) has long been accustomed to the mysterious rumble known to the local Indians long before the Europeans arrived. And rumbles with such force that they shake at home, it crashes dishes, and once, they say, someone was even thrown out of bed. Thunder, reminiscent of the sound of a cannon shot, then the sound of a fall a huge log, then the rumble of a heavy train, It is considered by local Indians a manifestation of the fury of the god Hobbamok. This the deity allegedly lives inside Mount Tom, which is located on northwest of the city. In the XVII century, the Indians assured arrivals here colonists from Europe that with a terrible roar God expresses his anger by about the appearance of uninvited guests. Most often this noise is heard in the hilly area of Mudus, dubbed Native American “Machimudus” (“place of bad noise”). Here is the curious thing: although the phenomenon often repeated, it rarely harms people and their property. “There is nothing to be afraid of; we are used to it,” said City Librarian Frans Cusaro. – Usually you worry, not will the boiler room explode in your basement, but everything is limited only beating plates. “Other locals are just as cool. School biology teacher James Meyer, who dedicated this phenomenon a whole job, explained: “Many do not pay attention to similar noise. You just hear this sound and think, for example: “Yeah, the sound barrier is taken.” However natural noises definitely exist, and their nature was studied by a group of experts under the guidance of Dr. John E. Ebil. 10 miles around Mudusa Ebil located a network of five seismographs. This is extremely the sensitive system noted the slightest oscillations of the earth, and in Mudus specially recruited “listeners” recorded acoustic phenomena. “Other listeners confirmed all Noises registered by me, – one of voluntary told “Listeners” Katie Wilson – except for one who turned out to be rifle shot. “Ebil concluded that these noises are the result of weak surface earthquakes that commonly called “microearthquakes”. “Awesome and unforeseen result of my research, – commented Ebil, – it became a fact that very weak microearthquakes cause to surface vibrations such that noise effects occur, do not inferior speaker power. “This explanation seems more acceptable than previous assumptions about gas explosions and violent chemical reactions occurring in the bulk Earth’s crust. How exactly does everything happen? And why does this happen only in Mudus? Scientists are still racking their brains: which one In this way, the geological features of the region turn the earth’s crust into acoustic resonator?
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