Distributed acoustic sensing (DAS): Shedding light on passive acoustics

A network of fiber-optic telecommunication cables spans 1.2 million km of the seafloor, covering both deep ocean and coastal areas around the globe. The cables are used to transmit phone calls, internet signals, and other data. Using a method called Distributed Acoustic Sensing (DAS), researchers are now working to repurpose these globally available telecommunication cables [...]

Distributed acoustic sensing (DAS): Shedding light on passive acoustics2023-09-20T10:01:30-05:00

Underwater Sound and Coral Reef Restoration

Global climate change is impacting the world’s coral reef ecosystems. Rapid ocean warming, and associated coral bleaching events, as well as increasing potential for impacts from tropical cyclones are causing significant damage to coral reefs. To better understand and mitigate these impacts, much work is being conducted in coral reef research, management, and conservation. [...]

Underwater Sound and Coral Reef Restoration2023-07-21T13:24:10-05:00

Using Drones to Deploy Digital Acoustic Tags

On June 8, 2022, the Bureau of Ocean Energy Management (BOEM) and the National Oceanic and Atmospheric Administration’s (NOAA) Stellwagen Bank National Marine Sanctuary announced the successful use of an uncrewed aerial vehicle (UAV, or drone), to deploy digital acoustic tags on 14 sei whales in the Northeast Atlantic. This marked a major innovation in [...]

Using Drones to Deploy Digital Acoustic Tags2022-06-24T17:02:42-05:00

Glacial Calving in the Arctic Produces Record Source Levels

Iceberg calving is a natural process, occurring when a rift opens in the edge of a glacier, caused by wind or water erosion, melting ice, or other events, resulting in an iceberg breaking away and falling into the ocean. The rate at which icebergs calve from glaciers increases with increased air and water temperatures. Polar [...]

Glacial Calving in the Arctic Produces Record Source Levels2022-03-15T16:20:42-05:00

Seafloor exploration with fin whale calls

Illustration of a seismic survey with two ships, one with the sound source and the other with an array of hydrophones. Image Credit: DOSITS. At the bottom of the ocean, there are layers of sediments that contain information about the Earth’s history and below the sediment are layers of the ocean crust.  Seismic [...]

Seafloor exploration with fin whale calls2021-10-06T12:27:46-05:00

Hot Topic – Sound waves from earthquakes can reveal changes in ocean temperature

Background One of the ocean’s response to global climate change is a rise in average water temperature. Where in the ocean the warming occurs and the rate at which it occurs are of great interest to climatologists. Measuring ocean temperature to monitor and understand changes due to climate change presents some challenges because: • The [...]

Hot Topic – Sound waves from earthquakes can reveal changes in ocean temperature2021-02-15T09:27:23-05:00

Underwater Acoustic Impacts of COVID-19

Updated October 16, 2020 Introduction The novel coronavirus (COVID-19) has had a major impact on society around the globe. Shelter-in-place orders and non-essential travel bans have had significant effects at all levels, from local to national economies. There have been unexpected, wide-ranging, trickle-down effects from these changes, including shifts in local and regional underwater [...]

Underwater Acoustic Impacts of COVID-192023-06-12T13:45:19-05:00

Changes in Baleen Whale Vocalizations

Decadal Decreases in the Frequency (Pitch) of Baleen Whale Vocalizations Blue whales are the largest living mammal species. Their long, slender bodies can reach lengths of 30.5 m (100 ft) and weigh up to 160 tons. Blue whales produce stereotyped calls, described as pulses, grunts, groans, and moans, which are typically in the 15-40 [...]

Changes in Baleen Whale Vocalizations2020-06-29T09:22:43-05:00

Decoding the hum of submarine volcanic eruptions

Earthquakes and other geologic events produce acoustic signals that can be measured and monitored on land and underwater. Seismic energy from submarine earthquakes is converted into acoustic energy at the seafloor-water boundary.  A Tertiary wave (or T-wave) is an acoustic signal associated with earthquakes. T-waves propagate efficiently in the ocean compared to seismic waves through [...]

Decoding the hum of submarine volcanic eruptions2020-11-23T12:38:43-05:00

Hot Topic- Killer Whales and Vessel Noise

Measuring and mitigating the potential impacts of vessel noise on endangered killer whales Underwater sound associated with commercial vessel traffic is one, recognized threat to the southern resident population of killer whales. Image credit: NOAA, NWFSC. Southern resident killer whales (SRKW) are an endangered marine mammal population found off the Pacific coasts of [...]

Hot Topic- Killer Whales and Vessel Noise2020-11-23T12:38:21-05:00
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