Japan Earthquake: Can We Ever Predict Quakes?

Engineers build warning systems, but actual forecasts still far off.

ByABC News
March 11, 2011, 11:54 AM

March 11, 2011 — -- The earthquake in Japan reminded people what they already knew -- that disaster can hit an earthquake zone at any time, and a tsunami can spread for thousands of miles.

But predicting an earthquake is still all but impossible. The fault lines on a map of California, for example, are far more intricate than any roads on the suface above them, which makes it hard for reserarchers to pick out patterns that let them know them an earthquake is coming.

"There's currently no organization or scientist capable of successfully predicting the time and occurrence of an earthquake," said Michael Blanpied of the U.S. Geological Survey in Virginia. "However, scientists are very good at saying things more general about earthquake hazards and earthquake risks.

"Using that information, we can improve building codes. We can do land use planning," he said. "So we can forecast in the long term where the earthquake hazard is likely to be."

Japan, having learned from bitter experience about earthquakes, had one of the world's most advanced early-warning systems, set up by its meteorological service.

Seismometers were wired so that if an earthquake happened, say, 100 miles down a fault line from a major city, people would get immediate warnings by TV, radio, cell phone or e-mail. Vibrations from the earthquake can spread at up to 5 miles per second -- but the electronic warnings travel ahead of them at the speed of light, potentially giving people crucial extra seconds to get outside or under tables or door frames.

"What you're actually feeling are the seismic waves that spread ahead of the earthquake itself," said Geoffrey Abers, a research professor at Columbia University's Lamont-Doherty Earth Observatory in Palisades, N.Y. "This is something people have been talking about for decades."

Japan also has a history of building to protect against damage. Buildings are either buttressed against the shaking that happens in a quake or designed to sway so that they do not collapse.