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Earth's "hum" heard at ocean bottom

Lapping waves or crashing surf may come to mind for most people when they imagine the sounds of the ocean. But the ocean has other voices as well, including one produced by interactions of waves with the seafloor along the continental slope. Unlike waves on the shoreline, this steady, low sound, or “hum,” is inaudible to the human ear and has even proven difficult to detect in recordings made by ocean bottom seismometers (OBS). But in a new study in Geophysical Research Letters, researchers analyzing OBS data have now clearly identified the hum for the first time, which may allow it to be used to develop a better picture of Earth’s interior structure.
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Meteorology: Where do we go from here?

“Like anybody, I would like to live a long life. Longevity has its place. But I’m not concerned about that now. I just want to do God’s will. And He’s allowed me to go up to the mountain. And I’ve looked over. And I’ve seen the Promised Land. I may not get there with you. But I want you to know tonight, that we, as a people, will get to the promised land!” – Martin Luther King, Jr.,  (from his last speech, I’ve been to the Mountaintop, April 3, 1968)

Today, April 4, marks fifty years since the tragic assassination of the reverend Martin Luther King, Jr. As part of its commemoration of the event, Memphis held a two-day symposium April 2-3 asking the question: where do we go from here? Unsurprisingly, participants arrived knowing that despite progress over the ensuing half-century, much more remained to be done. They decided that the path forward lies in a rededication to those causes Dr. King espoused: racial equality; reduction of poverty; greater economic equity; better education for all; and more. Time to enter, not just view, the promised land.

Benchmarks: April 4, 2011: Air France Flight 447 wreckage found using modern oceanography tools

In the early morning hours of March 8, 2014, Malaysia Airlines flight 370 (MH370), en route from Kuala Lumpur to Beijing, lost communication with air traffic control during the transition between Malaysian and Vietnamese air space. It then disappeared, along with all 239 people aboard.
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