Tech & Science: Earthquake aftershocks could last months or even years, scientists say - PressFrom - United Kingdom
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Tech & ScienceEarthquake aftershocks could last months or even years, scientists say

06:30  06 july  2019
06:30  06 july  2019 Source:   latimes.com

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Scientists can ’t tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Depending on the size of the mainshock, aftershocks can continue for weeks, months , and even years after the mainshock!

Aftershocks can last for weeks to months . They may not occur continuously, with periods of quiet in between sequences And even though it's getting further away in time from the original earthquake , the magnitude of aftershocks won't "We could certainly have more in the 7 range," Blakeman said .

Earthquake aftershocks could last months or even years, scientists say © Irfan Khan/Los Angeles Times/TNS On Friday, July 5, 2019, Shalyn Pineda, regional supervisor of Kern Counties Libraries, helps pick up books at Ridgecrest Library in the wake of Thursday's 6.4 earthquake in Ridgecrest, Calif.

RIDGECREST, Calif. — The aftershocks from the July 4 magnitude 6.4 earthquake will probably “go on for months, if not years,” California Institute of Technology seismologist Egill Hauksson said.

That means the odds are decent that there could be another aftershock of magnitude 5 or greater at some point. A magnitude 5.4 aftershock already occurred early Friday morning, strong enough to awaken some residents of Los Angeles about 125 miles away.

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Scientists expect quake activity in Wairarapa for weeks after yesterday's 6.2 shake. GNS Science seismologist Dr Caroline Little said aftershocks , of which 30 were But the sequence was not likely to last as long as that which followed the rare doublet of severe quakes near the Cook Strait last year .

I have good news and bad news, first the bad news scientists are still recording aftershocks of the Inagahua earthquake After some extremely large events, they’ve persisted for months or even years . But, months later, every now and then , we’d either feel one, or see on the news, “Many felt

Aftershock sequences can last years, something that Los Angeles dealt with in the aftermath of the 1994 magnitude 6.7 Northridge earthquake.

By midday, there have been at least 17 magnitude 4 aftershocks since the mainshock, and at least 1,200 aftershocks.

Earthquake aftershocks could last months or even years, scientists say © Irfan Khan/Los Angeles Times/TNS Carmen Rivera on a morning walk with her dog, Ash, passes by a mobile home dislodged in Torusdale Estates mobile home park by Thursday's 6.4 earthquake in Ridgecrest, Calif., on Friday, July 5, 2019.

The continuing shaking left many residents rattled.

Shallice, a 32-year-old mother of five, sat outside the county library with her kids, waiting to be able to volunteer to clean up the shelves.

A car drove by and honked loudly, and the family jumped and looked toward the sound.

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Chileans will be feeling aftershocks from the devastating 8.8-magnitude earthquake for months and possibly years to come, scientists said "The larger the earthquake , the larger the aftershocks , the more of them and the longer they're going to last ," said John Bellini, a geophysicist at the US

the time aftershocks last depend on how big the main shock(main earthquake ) was it can last from days to weeks to even years depending upon how big the Weeks, months maybe. Nothing is sure. Generally the shocks subside rapidly but in tectonically active zones it may take long to settle down.

Earthquake aftershocks could last months or even years, scientists say © Marcus Yam/Los Angeles Times/TNS Dr. Lucy Jones explains the nature of how the earthquake formed at a press conference in response to the 6+ magnitude earthquake that struck near Ridgecrest, at Cal Tech, in Pasadena, Calif., on July 4, 2019.

“We’re definitely jumpy,” said Shallice, who declined to give her last name.

Noises and small movements all day have the children anxious, she said. Earlier, they heard a car exhaust backfire and screamed.

As aftershocks have rolled through, she has watched her children’s reactions.

“If you watch kids, everybody just watches,” she said. “It’s natural instinct. Your mind just goes into instant mode of what do I need to do in a split second, and you have all these going on.”

Related slideshow: Tips to help you prepare for an earthquake (Provided by Photo Services)

Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say
Earthquake aftershocks could last months or even years, scientists say

Further study of the July 4th mainshock showed that the fault ruptured along a length of fault 10 miles long, from a remote point northeast of Ridgecrest, a city of 29,000 people, and continued southwest almost all the way to the city limits, Hauksson said.

Hauksson said the earthquake is a reminder that a big earthquake can hit California at any time. “People ought to think about their earthquake preparedness,” he said.

Scientists from the U.S. Geological Survey, California Geological Survey and elsewhere were already fanning over the area, documenting how the ground was literally broken by the earthquake, including with preliminary reconnaissance by helicopter. There’s some complication given that the rupture continues on to the Naval Air Weapons Station China Lake, a sprawling facility larger than the size of Rhode Island, and it’s taking time to secure permission to analyze the broken ground on the Navy property.

Earthquake aftershocks could last months or even years, scientists say © Marcus Yam/Los Angeles Times/TNS USGS Seismologist Robert Graves and Dr. Lucy Jones speak at a press conference in response to the 6+ magnitude earthquake that struck near Ridgecrest, at Cal Tech, in Pasadena, Calif., on July 4, 2019.

Photos already indicate that in some places along the ruptured fault, one side of the earth moved past the other by perhaps 6 to 8 inches, said Rob Graves, research geophysicist with the USGS.

In other areas, there’s a broad zone of deformed earth distributed over perhaps a couple of hundred feet on either side of the fault, Graves said.


Largest earthquake in decades hits Southern California, measuring 6.4 magnitude.
A 6.4 magnitude earthquake struck Southern California on Thursday, the largest temblor to hit the region in decades. 

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