Since there's nowt but sea from here to Holland I find it quite plausible that the sound could continue on that far. How is sound used to communicate underwater? How is sound used to help make long-term measurements of the ocean? Say goodbye to worktime boredom. What makes the sound speed change? J. D. Colladon, Souvenirs et Memoires, Albert-Schuchardt, Geneva, 1893. The speed of the wave affects the distance that it can travel. I live about 30 miles east of the blast so how it could be heard 200 miles away is beyond me!Ross, UK, It occurred to me that the sound I heard in Guildford, 40 miles away, would have taken about 3 mins to reach me!Tom Blandford, UK, We live at the end of St Albans that is furthest from Hemel Hempstead, and whilst our friends a mile or so across twon could hear all three + explosions, we only heard the first low 'grumble' and the shock wave... so how can they have heard the explosions on the other side of the channel, I wonder? The SOFAR Channel. Such a wave is called a longitudinal wave as the vibrations move in the same direction as the wave moves. Webinar Archive: Fundamentals of Underwater Sound, Webinar Archive: NMFS Regulatory Approach, 2019 Webinar Series Archive: Anthropogenic Sound Sources, Webinar Archive: Pile Driving and Wind Turbines, Webinar Archive: Commercial Vessel Traffic, Webinar Archive: Sonar, Echosounders & Military Sonar, Webinar Archive: Sound Reception in Marine Mammals, Webinar Archive: Potential Effects of Sound on Marine Mammals, Webinar Archive: Sound Production and Reception in Teleost Fishes, Webinar Archive: Potential Effects of Sound on Marine Fishes, Webinar Archive: Marine Animal Sound Production and Reception, Webinar Archive: Potential Effects of Sound on Fishes, DOSITS Webinar Testing and Troubleshooting Tips, Decision Makers Effects of Sound Tutorial Introduction, Determine if a Sound Affects a Marine Animal Tutorial Introduction, Tutorial: Sound Levels at Distance and Depth. Here we are referring to the ocean pressure due to the weight of the overlying water (equilibrium pressure), not to the pressure associated with a sound wave, which is much, much smaller. This phenomenum lead to the discovery of The Heaviside Layer which reflected the sound back to earth.

The depot, storing oil, petrol as well as kerosene, supplies airports across the region, including Heathrow. Tutorial: Where are marine animals likely to be located relative to the source?

How is sound used to estimate marine mammal abundance? How is sound used to measure rainfall over the ocean? In 1826 on Lake Geneva, Switzerland, Jean-Daniel Colladon, a physicist, and Charles-Francois Sturm, a mathematician, made the first recorded attempt to determine the speed of sound in water. How does sound travel long distances? My friends doubted that I would have been able to hear it, but I know what I heard. How is sound used to study undersea earthquakes? The speed of sound in seawater is not a constant value. !Piers, UK, When the volcano in krakatoa exploded in 1883 it was desribed as the explosion that shook the earth ,both politically and literally . Sound travels about 1500 meters per second in seawater. Similar to the profile of your face that gives a side view of your face, an oceanographic profile gives you a side view of the ocean at that location from top to bottom. george, UK, What if it was something different they heard at the same time, e.g. This could be a liquid such as water, a solid such as a metal or, as in this case, a gas such as air. How does sea ice affect how sound travels? How does shipping affect ocean sound levels? This bends the audible energy back down to earth and the sound can be heard miles from the source. How is sound used to measure temperature in the ocean? Your comments may be published on any BBC media worldwide. When I saw the news reports I realised that it must have been the blast from the explosions. Why is sound important to marine animals? This is because the effect of salinity on sound speed is small and salinity changes in the open ocean are small. As the depth increases, the temperature gets colder and colder until it reaches a nearly constant value. This strong temperature inversion, combined with the huge amount of energy at the source of the blast and the easterly direction of the wind could have resulted in people in other countries hearing the sound of the explosion. I'm living at Kortrijk in Belgium about 60 km from the coast line.

How is sound used to measure global climate change? It discipates over time and distance. Sound Pressure Levels and Sound Exposure Levels, Ocean Noise Variability and Noise Budgets, Propagation from a sound source array in the near field and far field. How is sound used to research wind energy? i didn't hear it in london, and people in scotland didn't hear it!kirsty, uk, We heard this in Norwich, Norfolk.

How is sound used to measure, detect, and track oil? How is sound used to measure currents in the ocean? How is sound used to measure water depth? In fog and mist, sound is conducted much further than usual. On Sunday there were classic conditions for sound to travel further than usual.". The sound of the bell and flash from the gunpowder were observed 10 miles away on the second boat. Salinity has a much smaller effect on sound speed than temperature or pressure at most locations in the ocean. Sound does not have an infinite wave length like light and can't travel forever. How do marine invertebrates detect sounds? Tim Wilton, who works for Vibrock, an environmental consultancy, says it is unusual for it to travel 200 miles - but possible. How do people and animals use sound in the sea? How does marine life affect ocean sound levels? Thats approximately 15 football fields end-to-end in one second. The SOFAR Channel Section provides more information on how the sound speed minimum focuses sound waves into the channel. How is sound used to measure waves in the surf zone? Will 5G Impact Our Cell Phone Plans (or Our Health?!

We can look at the effect of each of these variables on the sound speed by focusing on one spot in the ocean. Kind regards Here are basic profiles for a site in the deep, open ocean roughly half-way between the equator and the North or South pole. On the other hand, salinity changes by only a small amount, from 34 to 35 Practical Salinity Units (PSU), approximately 34 to 35 parts per thousand (ppt). How is sound used to monitor and defend harbors? How is sound used to measure wind over the ocean? That must be a good 125 kms.Marianne, Belgium. Festival of Sacrifice: The Past and Present of the Islamic Holiday of Eid al-Adha. Science Tutorial: Sound Pressure Levels and Sound Exposure Levels, Decision Makers Sound Source Tutorial Introduction, WOTAN: “Wind Observations Through Ambient Noise”, Archival Marine Acoustic Recording Units (ARUs).

The speed of sound in water increases with increasing water temperature, increasing salinity and increasing pressure (depth). It varies by a small amount (a few percent) from place to place, season to season, morning to evening, and with water depth. If the reports are say, 10 minutes late, that could be accurate.

It travels as a wave, which is produced when something vibrates. 17,029 pages were read in the last minute. First I thought that there was a gas explosion in my local neighbourhood but later I learned that the explosion occured in the UK. We can clearly hear Friday-night music from sound systems - again despite intervening hills - as much as almost eight miles away on occasion. in all directions?Marjanne Worsley, England, We were definitely woken up by the sound of the explosion on Sunday morning, and we live in central London.sally fee, uk, Ever hear (sorry about the inadvertant pun) of the Halifax Disaster of December 6 1917 ? "But the blasts were unusual because you don't usually get that amount of energy at the source. "To hear it 200 miles away is unusual," says Mr Wilton. How is sound used to monitor nuclear testing? How far sound travels depends on different variants. The distance that a sound wave travels can be figured by multiplying the speed of the sound (approximately 345 meters per second under normal atmospheric conditions at a temperature of 20 degrees Celsius) by the time it takes for a person to hear it once the sound is initiated.

Old country ladies in Jamaica frequently practice the tradition of "yoahing." Sound travels much more slowly in air, at about 340 meters per second, only 3 football fields a second. I came back and read articles(I cannot proof the reliability) where sound had traveled 200 miles but it was mostly sounds from explosion or volcanoes.

On watch during still foggy night in the North Atlantic, I've clearly heard warning fog horn of other ships, long before they appeared on the radar.In fact, their clarity was deceptive, and the radar was always consulted since they could sound much closer than they really were. He says a strong "temperature inversion" on Sunday will have been one of the reasons the sounds of the blast travelled so far. Depth profiles from the open ocean of temperature, salinity and density. The sound speed at the surface is fast because the temperature is high from the sun warming the upper layers of the ocean. We know that sound travels. We know that sound travels. Sound travels about 1500 meters per second in seawater. I also read that it was claimed the nosie rang round the world word for 9 days and made water slosh the other side of the world. If sound can travel that far surely 200 miles is nothing.Gareth, Sheffield, UK, It is refreshing to see a presentation of the educational aspect of a current news item. In 1946 I was 7 years of age and the BBC announced on the radio news that the bomb dump in Heligoland was to be blown up. I won't mention the three or four nearer systems! Unfortunately, the answer is really not quite that simple. Here we will examine the temperature profile, the salinity profile, and the pressure profile. I was in my house in Penarth and wondered what on earth it could be as I had never heard anything like it before. How is sound used to study marine mammal distribution? The distance that a sound wave travels can be figured by multiplying the speed of the sound (approximately 345 meters per second under normal atmospheric conditions at a temperature of 20 degrees Celsius) by the time it takes for a person to hear it once the sound is initiated. Could the noise really have travelled that far? Hearing in Cetaceans and Sirenians, the Fully Aquatic Ear. This happens when there is a layer of warmer air at altitude rather than air cooling as it goes up. The spot we are going to explore is in the middle of the deep ocean. How is sound used to explore for oil and gas? That’s approximately 15 soccer fields end-to-end in one second. When oceanographers look at the change of an oceanographic variable with water depth, they call it a profile. We didn't hear a thing!! The guns could not be hearrd within this arc. Near shore and in estuaries, where the salinity varies greatly, salinity can have a more important effect on the speed of sound in water. The blasts are said to be the largest of their kind in the UK and Europe during peacetime. Myself, my partner and our 2 young children were all tucked up in bed at the time of the explosion. Tutorial: How can we moderate or eliminate the effects of human activities. How fast does it travel? What components of sound are used for hearing? I know this is in a valley and the DJ - because I delivered and set up the system. The time between the gunpowder flash and the sound reaching the second boat was used to calculate the speed of sound in water. Depth (pressure) 1km = 17 m/s. It is important to understand that the way sound travels is very much dependent on the conditions of the ocean. How do marine invertebrates produce sounds? That's a big explosion! We are approximately 120 miles (as the crow flies)from Hemel Hempstead and we overlook the Bristol channel, so the sound would have travelled quite well over the water. Its also very lucky that it was a clear day on Sunday as the shock wave from an explosion can be refelcted off a cloud base. In their experiment, the underwater bell was struck simultaneously with ignition of gunpowder on the first boat.