Monday, June 10, 2019
By Paul Martin

Mac Slavo
June 10th, 2019

A seismologist working on researching the recent earthquakes in Southern California said they have taken an unexpected turn, and that’s a reason to worry. Caltech seismologist Egill Hauksson says residents should be alert and on their toes.

“People ought to be concerned,” said Hauksson of the earthquake swarm near the city of Fontana, California. “This is probably the most prolific swarm in that area of the Fontana seismic zone that we’ve seen in the past three decades.” This swarm of earthquakes has shown remarkable staying power in the area around the Southern California city, according to the LA Times.

The likelihood of a larger seismic event, given how many quakes that have occurred over such an extended period, is higher than normal, Hauksson said. The tremors could turn into a large and destructive quake, although the chances of that aren’t exactly sky high. For all intents and purposes, Hauksson has been rather vague on whether this will be a sizeable and destructive event.

“This is somewhat of an unexpected evolution,” Hauksson said Friday evening. An analysis of the earthquakes showed that activity as of late Friday was fading pretty slowly. Much slower than would be expected for a typical sequence of aftershocks following the main shock, Hauksson said. “That would suggest it’s going to continue for — I don’t know — at least several weeks,” Hauksson said Friday. “We’re watching what’s happening and trying to track that activity.”

By Saturday afternoon, earthquake activity had decreased significantly. “This is difficult to interpret, but it suggests that the sequence is now decaying somewhat similar to an aftershock sequence,” Hauksson said. “There will be fewer and fewer events as time goes on.”

Hauksson said the timing of the earthquakes is worth noting, however. The shaking was followed by a lull and then a spurt of new quakes and the earthquakes have been relatively shallow beginning just 1 to 2½ miles under the surface. As a result, the shaking has been widely felt, said Jen Andrews, a Caltech staff seismologist.

The Rest…HERE

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