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Unidentified Sounds
The following is a list of unidentified, or formerly unidentified, sounds. All of the sound files in this article have been sped up by at least a factor of 16 to increase intelligibility by condensing them and raising the frequency from infrasound to a more audible and reproducible range. Unidentified sounds The following unidentified sounds have been detected by the U.S. National Oceanic and Atmospheric Administration (NOAA) using its Equatorial Pacific Ocean autonomous hydrophone array. Upsweep Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each. The source level is high enough to be recorded throughout the Pacific. The sound appears to be seasonal, generally reaching peaks in sprin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infrasound
Infrasound, sometimes referred to as low status sound, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz). Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing low sound, but at higher intensities it is possible to feel infrasound vibrations in various parts of the body. The study of such sound waves is sometimes referred to as infrasonics, covering sounds beneath 20 Hz down to 0.1 Hz (and rarely to 0.001 Hz). People use this frequency range for monitoring earthquakes and volcanoes, charting rock and petroleum formations below the earth, and also in ballistocardiography and seismocardiography to study the mechanics of the heart. Infrasound is characterized by an ability to get around obstacles with little dissipation. In music, acoustic waveguide methods, such as a large pipe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ross Sea
The Ross Sea is a deep bay of the Southern Ocean in Antarctica, between Victoria Land and Marie Byrd Land and within the Ross Embayment, and is the southernmost sea on Earth. It derives its name from the British explorer James Clark Ross who visited this area in 1841. To the west of the sea lies Ross Island and Victoria Land, to the east Roosevelt Island and Edward VII Peninsula in Marie Byrd Land, while the southernmost part is covered by the Ross Ice Shelf, and is about from the South Pole. Its boundaries and area have been defined by the New Zealand National Institute of Water and Atmospheric Research as having an area of . The circulation of the Ross Sea is dominated by a wind-driven ocean gyre and the flow is strongly influenced by three submarine ridges that run from southwest to northeast. The circumpolar deep water current is a relatively warm, salty and nutrient-rich water mass that flows onto the continental shelf at certain locations. The Ross Sea is covered with ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moodus Noises
Moodus is a village in the town of East Haddam, Connecticut, United States. The village is the basis of a census-designated place (CDP) of the same name. The population of the CDP was 1,982 as of the census of 2020. History Prior to its purchase by English settlers in 1662, the area around Moodus was inhabited by Native American Algonquians, three of which tribes are known: the Wangunks, the Mohegans and the Nehantics. The name was derived from the Native American name for the area – "Matchetmadosett" or "Matchitmoodus", ''the place of noises'', possibly because of earthquakes. Numerous earthquakes were recorded in the area between 1638 and 1899. Loud rumblings, the "Moodus Noises", could be heard for miles surrounding the epicenter of the quakes near Mt. Tom. The land, which is now the towns of Haddam and East Haddam, was purchased by settlers from the Indians in 1662 for thirty coats – worth about $100. During the nineteenth century, Moodus was advertised as the "Twine C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forest Grove, Oregon
Forest Grove is a city in Washington County, Oregon, United States, west of Portland. Originally a small farm town, it is now primarily a commuter town in the Portland metro area. Settled in the 1840s, the town was platted in 1850, then incorporated in 1872, making it the first city in Washington County. The population was 21,083 at the 2010 census, an increase of 19.1% over the 2000 figure (17,708). Located in the Tualatin Valley, Oregon routes 8, and 47 pass through Forest Grove with 47 and 8 signed as the Tualatin Valley Highway south and east of the main part of the city, respectively, Oregon Route 8 signed as Gales Creek Road west of the city, and Oregon Route 47 signed as the Nehalem Highway north of the city. Pacific University has been the most distinctive aspect of the town throughout its history. Old College Hall on campus is listed on the National Register of Historic Places along with nine other structures in the city. History Prior to the 1840s when Euro-America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forest Grove Sound
The Forest Grove Sound was an unexplained noise, described by ''The Oregonian'' as a "mechanical scream", heard in Forest Grove, Oregon in February 2016. In February 2016, a high-pitched noise was heard intermittently at night in Forest Grove, Oregon. The Department of Forestry determined that their equipment was not the cause of the sound. The news about the noise was first shared with Dave Nemeyer by a Forest Grove resident, who posted a video of it on the city's Facebook page. The ''Washington Post'' described the noise as sounding like a "giant flute played off pitch", car brakes, or a steam whistle. NBC News described it as "akin to a bad one-note violin solo broadcast over a microphone with nonstop feedback". It reportedly lasted from ten seconds to several minutes at a time. The fire department of Forest Grove did not consider the sound to be a safety risk. The noise occurred near Gales Creek Road. Neither the City of Forest Grove Public Works Department nor the Fire Departme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fury And Hecla Strait
Fury and Hecla Strait is a narrow (from wide) Arctic seawater channel located in the Qikiqtaaluk Region of Nunavut, Canada. Geography Situated between Baffin Island to the north and the Melville Peninsula to the south, it connects Foxe Basin on the east with the Gulf of Boothia on the west. Water flow in the strait is sometimes westerly and sometimes easterly – there are diurnal and semidiurnal components to the flows; tidal and subtidal effects also play a role. The strait provides Arctic Ocean drainage for Hudson Bay via Foxe Basin. Several islands of the Arctic Archipelago are located inside the strait: Saglirjuaq (Liddon Island), Simialuk (Ormonde Island) and Saglaarjuk (Amherst Island) are the largest ones. History of exploration The Strait is named after the Royal Navy ships HMS ''Fury'' and HMS ''Hecla'', which encountered the strait in 1822 during an expedition led by Sir William Edward Parry. Both ships became stuck in ice in October 1821, and remained immobile for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Minke Whale
The Antarctic minke whale or southern minke whale (''Balaenoptera bonaerensis'') is a species of minke whale within the suborder of baleen whales. It is the second smallest rorqual after the common minke whale and the third smallest baleen whale. Although first scientifically described in the mid-19th century, it was not recognized as a distinct species until the 1990s. Once ignored by the whaling industry due to its small size and low oil yield, the Antarctic minke was able to avoid the fate of other baleen whales and maintained a large population into the 21st century, numbering in the hundreds of thousands.Branch, T. A. (2006). "Abundance estimates for Antarctic minke whales from three completed circumpolar sets of surveys, 1978/79 to 2003/04". ''Paper'' SC/58/IA18 ''submitted to the International Whaling Commission Scientific Committee'', pp. 1–28. Surviving to become the most abundant baleen whale in the world, it is now one of the mainstays of the industry alongside its c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bio-duck
Bio-duck is a sound recorded in the Southern Ocean, specifically in Antarctic Waters and the West Coast of Australia. It was first reported in 1960 by submarine personnel, who gave the sound its name, associating it with that of a duck. Once dubbed as the “largest still unresolved mysteries of the Southern Ocean”, the origin of the sound remained a mystery for decades until 2014, when it was concluded that the sound originated from Antarctic Minke Whales. The recorded sound has a frequency range between 60 Hz to 100 Hz, harmonics up to 1khz, and an interval of 1.6 to 3.1 seconds between each sound. The sound is mainly present during austral winter in the southern ocean, detected off Western Australia and the Antarctic waters. The sound is made near the surface, predominantly before feeding dives. Although the role of the sound remains a mystery, it is suggested that it could play a role in mating. Researchers say that this discovery is significant in estimating sea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Train Spectrogram
In rail transport, a train (from Old French , from Latin , "to pull, to draw") is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives (often known simply as "engines"), though some are self-propelled, such as multiple units. Passengers and cargo are carried in railroad cars, also known as wagons. Trains are designed to a certain gauge, or distance between rails. Most trains operate on steel tracks with steel wheels, the low friction of which makes them more efficient than other forms of transport. Trains have their roots in wagonways, which used railway tracks and were powered by horses or pulled by cables. Following the invention of the steam locomotive in the United Kingdom in 1804, trains rapidly spread around the world, allowing freight and passengers to move over land faster and cheaper than ever possible before. Rapid transit and trams were first built in the late 1800s to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from ''angular frequency''. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the interval of time between events, so the period is the reciprocal of the frequency. For example, if a heart beats at a frequency of 120 times a minute (2 hertz), the period, —the interval at which the beats repeat—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light. Definitions and units For cyclical phenomena such as oscillations, waves, or for examples of simple harmonic motion, the term ''frequency'' is defined as the number of cycles or vibrations per unit of time. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slow Down
Slow Down or slowdown may refer to: Music * ''Slow Down'' (album), by Keb' Mo', 1998 Songs * "Slow Down" (Bobby Valentino song), 2005 * "Slow Down" (Brand Nubian song), 1991 * "Slow Down" (Douwe Bob song), representing the Netherlands at Eurovision 2016 * "Slow Down" (Lacy J. Dalton song), 1982 * "Slow Down" (Larry Williams song), 1958; covered by the Beatles, 1964 * "Slow Down" (Loose Ends song), 1986 * "Slow Down" (Selena Gomez song), 2013 * " (Ha Ha) Slow Down", by Fat Joe, 2010 * "Slow Down", by the Academy Is... from '' Almost Here'', 2005 * "Slow Down", by Alejandro Escovedo from ''Real Animal'', 2008 * "Slow Down", by Alicia Keys from ''The Diary of Alicia Keys'', 2003 * "Slow Down", by Aly & AJ from ''Into the Rush'', 2005 * "Slow Down", by Blur from ''Leisure'', 1991 * "Slow Down", by Clyde Carson, 2012 * "Slow Down", by Dimitri Vegas & Like Mike, 2018 * "Slow Down", by Dirty Heads from '' Super Moon'', 2019 * "Slow Down", by Estelle from ''Lovers Rock'', 2018 * "S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azimuth
An azimuth (; from ar, اَلسُّمُوت, as-sumūt, the directions) is an angular measurement in a spherical coordinate system. More specifically, it is the horizontal angle from a cardinal direction, most commonly north. Mathematically, the relative position vector from an observer (origin) to a point of interest is projected perpendicularly onto a reference plane (the horizontal plane); the angle between the projected vector and a reference vector on the reference plane is called the azimuth. When used as a celestial coordinate, the azimuth is the horizontal direction of a star or other astronomical object in the sky. The star is the point of interest, the reference plane is the local area (e.g. a circular area with a 5 km radius at sea level) around an observer on Earth's surface, and the reference vector points to true north. The azimuth is the angle between the north vector and the star's vector on the horizontal plane. Azimuth is usually measured in d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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