Sentences with phrase «by hydrophones»

Just imagine a crack that lasts 1/10, 000 of a second but can be picked up by hydrophones — and heard by other sperm whales — at a distance of 15 miles or more.

Not exact matches

The researchers measured the sound produced by the fish using an echo sounder (a sonar unit) and a hydrophone (underwater microphone).

Questions remain, however, such as if seismometers are sufficient for remote monitoring or if the more accurate information provided by cabled hydrophone arrays is worth the greater expense.

The Navy wanted to know if hydrates under the seafloor were interfering with acoustic signals picked up by an underwater hydrophone array used by the military to track Soviet subs.

Monitor endangered Pacific Northwest killer whales by detecting orca sounds and measuring noise levels using hydrophones

The researchers used a small boat to tow an array of underwater microphones, called hydrophones, about 2 meters below the surface and recorded the sounds of individual dolphins identified by their dorsal fins.

But the CTBTO's stations have two sets of three hydrophones separated by several kilometers, which — like a pair of human ears — allow listeners to get a fix on a sound's direction to within 0.5 °.

To do this, the researchers use underwater microphones called hydrophones on oceanographic moorings to listen for the sounds made by marine mammals.

The sound blasts reflected from the boundaries between rock layers a few miles beneath the ocean floor were picked up by an five - mile - long «streamer,» or hose containing many hydrophones, towed just beneath the surface behind the ship.

It's dark when I get up at 6 am, the first hint of a new day on the horizon; the forest floor has turned gold and green as the cedars shed their summer cloak; honeysuckle leaves litter the boardwalks and garden ground; bright red honeysuckle berries are being plucked by tiny wrens; jays are sitting in the apple tree, feasting on the fruit we imagined as apple pie; the last roses are fading; fronds of great bull kelp are landing on the beach, food for next year's garden; the sudden daybreak howl of sporty boats heading to the hot fishing spots where we have our hydrophones has gone; sea lions are beginning to heave their huge bodies onto haul - out rocks along the way; most of our assistants have left, heading back to school or home; and in their absence we are spending more time in the lab at night, recording the voices of the orcas, who are still here.

We had 2 clans of orcas instantly, Wayne shut down the vessel, the hydrophone was deployed, and we watched and listened to these 2 families hunt salmon as they passed by the vessel.

These stations have an underwater microphone called a hydrophone that picks up specially coded messages released by the transmitters attached to the rays.

When the QUEphone is ascending / descending it gets pushed around by the ocean currents so it can't be as accurate for locating the source of seismic events as a moored hydrophone array, which is why it's called Quasi-Eulerian.

Every once in a while there's some good news on the endangered species front: A team of scientists from Oregon State University and the National Oceanic and Atmospheric Administration has discovered an undetermined number of North Atlantic right whales, in an area where it was thought they had been hunted nearly extinction over a hundred years ago: The whales were discovered by using a series of underwater hydrophones to record the sound of the whales over hundreds of miles of ocean.