Tag Archives: japan megaquake

No long-distance risks from mega-quakes says study

Monster earthquakes like the 9.0-magnitude event that occurred off Japan on March 11 are unlikely to trigger a large quake in distant regions of the world, according to a study published on Sunday.

The research — coincidentally published in the wake of the tsunami-generating killer — counters a novel theory that an exceptional quake in one continent can unleash a temblor in another.

Tom Parsons of the US Geological Survey (USGS) and Aaron Velasco of the University of Texas at El Paso cast their net in 30 years of data.

They looked at all earthquakes around the world that were 7.0 magnitude or above and were followed by quakes greater than magnitude 5.0.

Their trawl came up with 205 main shocks, and more than 20,000 hypothetical secondary shocks.

There was a "significant increase" in seismic activity in adjoining areas of the fault, they found.

This confirms beliefs that a big quake places stress on a nearby section of the same fault, which then ruptures, rather like buttons on a shirt that pop off one by one.

Read the rest of the story: AFP: No long-distance risks from mega-quakes: study.

High chance of magnitude-7 or higher quake in Japan in next few days

As Japan scrambles to pick up the pieces from Friday’s magnitude-9 earthquake and tsunami, the Kyodo news agency is reporting that there is a 70% chance of a magnitude-7 or greater quake taking place in the next three days.

Kyodo also reports that there is a 50% chance of one hitting in the three days after that.

Japan’s largest earthquake on record may have knocked the planet 3.9 inches off its axis as one crustal plate slid beneath another, Eric Fielding, a principal scientist with the Jet Propulsion Laboratory in Pasadena, Calif., told Bloomberg news agency.

Read the rest of the story: Report: High chance of magnitude-7 or higher quake in Japan in coming days.