Tide

Can the Moon Cause Earthquakes?

Publication: National Geographic News   Date: May 23, 2005   View Article

Coast dwellers are accustomed to the daily rhythm of the tides, which are primarily lulled in and out by the gentle gravitational tug of the moon. Some scientists wonder whether the moon’s tugging may also influence earthquake activity.

“The same force that raises the ‘tides’ in the ocean also raises tides in the [Earth’s]crust,” said Geoff Chester, an astronomer and public affairs officer with the U.S. Naval Observatory in Washington, D.C.

Noisy Reefs Preferred by Young Fish, Study Says

Publication: National Geographic News   Date: April 7, 2005   View Article

Travel brochures often use coral reef imagery to lure tourists to seemingly tranquil locales. Don’t be fooled: Reefs are anything but quiet. And that’s a welcome fact if you’re a reef fish looking for a place to settle, scientists say.

Many reef fish coordinate their egg laying with the tides. That way, their baby fish, or larvae, drift out to sea upon hatching, explained Stephen Simpson, a tropical reef ecologist at the University of Edinburgh in Scotland.

Underwater Windmill Helps Power Arctic Village

Publication: National Geographic News   Date: October 9, 2003   View Article

Energy derived from the moon now trickles into a village near the Arctic tip of Norway via a novel underwater windmill-like device powered by the rhythmic slosh of the tides.

The so-called tidal turbine is bolted to the floor of the Kvalsund Channel and was connected to the nearby town of Hammerfest’s power grid on September 20. It is the first time in the world that electricity directly from a tidal current has been fed into a power grid.

© 2008-2010 Collected Writings By John Roach