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In Shallow Water Ships Trigger Seafloor Methane Emissions, Study Finds

1 month 1 week ago
An anonymous reader shared this report from the Washington Post: Ships trigger seafloor methane emissions while moving through shallow water, researchers report in Communications Earth & Environment. The scientists say the unexpected discovery has nothing to do with the type of fuel used by the ship. Instead, "ship-induced pressure changes and turbulent mixing" trigger the release of the gas from the seafloor. Bubbles and gas diffusion push the methane into the atmosphere, where it acts as a greenhouse gas... Container and cruise ships triggered the largest and most frequent methane emissions, but the study suggests that ships of all kinds, regardless of their type of engine or size, trigger methane emissions. Researchers said they observed emissions that were 20 times higher in the shipping lane than in undisturbed nearby areas. Given the number of ports in similarly shallow areas worldwide, it's important to learn more about emissions in shipping lanes and to better estimate their "hitherto unknown impact," study co-author Johan Mellqvist, a professor of optical remote sensing at Chalmers University of Technology in Sweden, said in a news release.

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EditorDavid

Android Phones Can Detect Earthquakes Before the Ground Starts Shaking

1 month 1 week ago
Electronic messages travel faster than seismic waves, Gizmodo points out — meaning some people near an earthquake receive an Android Earthquake Alert "before the seismic waves reach them — and even a few seconds could be just enough time to hide under a table or run outside." Richard Allen from the University of California in Berkeley's Seismological Laboratory, writes in a new study that "The global adoption of smartphone technology places sophisticated sensing and alerting capabilities in people's hands, in both the wealthy and less-wealthy portions of the planet." From Gizmodo: According to the study, 70% of the world's smartphones are Android phones, which by default come with the aforementioned sensing and alerting capabilities. From 2021 to 2024, the Android Earthquake Alert (AEA) system detected an average of 312 earthquakes per month across 98 countries. The earthquakes had a magnitude between 1.9 and 7.8, and the system alerted users of earthquakes at or over a magnitude of 4.5, averaging around 60 events and 18 million alerts per month. The AEA system also collected user feedback, revealing that 85% of users who received alerts experienced shaking, with 36% receiving the alert before, 28% during, and 23% after the shaking began... "AEA demonstrates that globally distributed smartphones can be used to detect earthquakes and issue warnings at scale with an effectiveness comparable to established national systems," the researchers wrote. The system detected 11,231 earthquakes between April of 2021 and March of 2024, according to the study, which notes that the length of the advanced warning "ranged from seconds up to a minute" for moderate shaking, and about 15 seconds for the strongest shaking.

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EditorDavid