Strongest earthquake since 20 years
rattles Southern
California
After Ridgecrest earthquake:
NO SHAKING EXPECTED
Did ShakeAlert work or not?
It detected the quakes, but did not issue alerts:
Despite ‘Shake Alert’ Warning System,
Los Angeles Residents Did Not Receive Notification
Richard Allen @RAllenQuakes
Despite ‘Shake Alert’
Warning System,
Los Angeles Residents
Did Not Receive Notification
By Scott Budman
Published Jul 4, 2019 at 5:00 PM | Updated at 6:29 PM PDT on
Jul 4, 2019
Seismologists say a
new warning system being tested gave them nearly a full minute warning that an
earthquake was coming, but residents in Southern California said they did not
receive the alert.
Bay Area residents have seen a "shake alert" in
action as it was developed, and on Thursday, United States Geological Survey
officials said the warning system worked during the Ridgecrest earthquake.
"The idea is to give you warning that an earthquake has
occurred, and you're about to feel a strong shaking," said Dr. Angela
Chung, an early warning expert with the UC Berkeley Seismology Lab.
Chung said the alert worked and gave the USGS about 48
seconds worth of warning Thursday. But the alert did not go out to the people
in Los Angeles because it didn’t measure strong enough.
Ridgecrest On the Road to Recovery, Officials Urge Residents
to Be Prepared for Natural Disasters
"We know that the system worked, but the app has
parameters; it doesn't give a message if it’s below this level," said Dr.
Lucy Jones, a seismologist with Caltech.
By the time the quake reached the big cities, it didn’t
trigger the alert, Chung said. The alert has a limit so residents don’t receive
a notification every time there is an earthquake.
"We don’t want to be a nuisance, to tell you about
every little teeny, tiny earthquake because that’s not what the system is
designed for," Chung said. "The system is designed to save lives and
property and damage."
4 Shot in San Jose; Suspect Remains at Large: Police
Experts said it’s a fine line between providing an ample
warning in advance of a strong earthquake or "over" warning residents
ahead of the small ones.
**********
After big Southern
California earthquake,
months of aftershocks to follow
UPDATED ON: JULY 6, 2019 / 4:40
PM / CBS NEWS
Crews in Southern California were assessing the damage
Saturday after the region was rattled by another powerful earthquake late
Friday evening. The magnitude 7.1 quake caused injuries, sparked fires and
closed roadways but no deaths were reported.
The epicenter of Friday night's 7.1 magnitude earthquake was
11 miles from Ridgecrest in the same area where a 6.4 magnitude temblor hit
just a day earlier. The latest earthquake happened just after 8 p.m. local time
and was centered in the Mojave Desert near the town of Ridgecrest, which is
still recovering from a 6.4 quake on the Fourth of July. Ridgecrest used to be
known as the earthquake capital of the world because it had so many small
quakes.
Social media posts showed restaurant lights swaying, items
crashing from store shelves and vehicles shaking violently more than 100 miles
from the center of the quake.
Friday night's quake is Southern California was most
powerful one since a 7.1 quake struck near a U.S. Marine Corps base in the
Mojave Desert in 1999. The last earthquake to cause major destruction in the
region was in 1994 when a 6.7 magnitude quake in densely populated Northridge
killed 57 people and caused billions of dollars in damage.
Scientists expect more shaking in region
A seismologist in California says scientists believe the
sequence of earthquakes striking the Mojave Desert will produce more than
30,000 quakes of magnitude 1 or greater over six months.
Small town hit hard by earthquake
Fire officials say as many as 50 structures in the small
town of Trona were damaged by the magnitude 7.1 earthquake Friday night in
Southern California. In addition, San Bernardino County Supervisor Robert
Lovingood said Saturday that damaged water lines prompted FEMA to deliver a
tractor-trailer full of bottled water to the town, and firefighters were
checking numerous reports of gas leaks.
In Trona, Calif. the town was temporarily cut off after the
earthquake, when officials shut down a highway connecting Trona to Ridgecrest
because of rockslides and cracks in the roadway. Julia Doss, who maintains the
Trona Neighborhood Watch page on Facebook, said residents reported that
chimneys and entire walls collapsed during the quake. She said the only food
store in town has been shuttered.
Navy base "not mission capable" after quake
Multiple earthquakes that struck the Ridgecrest area left
Naval Air Weapons Station China Lake "not mission capable until further
notice," the base announced Saturday. In a Facebook post, the base said
that Rear Admiral Bette Bolivar issued an evacuation order for non-essential
active duty, drilling reservists, civilian employees, and dependents to
evacuate to a radius of 100 miles from Naval Base Ventura County.
National Guard mobilized
The California National Guard was sending 200 troops,
logistical support and aircraft, said Maj. Gen. David Baldwin. The Pentagon had
been notified, and the entire California Military Department was put on alert,
he said.
No deaths reported from quake
A fire official says there were no fatalities or major
injuries in Ridgecrest after the earthquake on Friday night. Kern County Fire
Chief David Witt also said Saturday there were no major building collapses but
some structures could be weakened from the back-to-back quakes.
Amusement parks closed
The quake affected amusement parks across two states. Six
Flags Magic Mountain in Santa Clarita and Disneyland in Orange County closed
their rides while the Big Apple Coaster swayed at the New York-New York hotel
in Las Vegas.
California governor issues emergency declaration
Governor Gavin Newsom issued an emergency declaration in
response to the damage reported in Ridgecrest. "On behalf of all
Californians, I offer my heartfelt support to those affected by tonight's
earthquake near Ridgecrest. The State of California will continue to offer
support to aid residents in the region," he said in a statement.
"I have also activated the State Operations Center in
Mather, California to its highest level and the center is already working
closely with state, federal and local emergency managers and first
responders."
In Kern County, houses throughout the town were strewn with
books, fallen televisions and broken glass, but most concerning is the
structural damage and cracks that can be seen in foundations.
"I was inside the house and it started shaking,"
resident Randy Witcher said. "I was in my lounge chair and it started
shaking and it continued."
"I fell down on the front porch," he said.
"It was very loud. You talk about a train rumbling, and that is what it
sounds like."
Dozens of aftershocks reported
Dozens of aftershocks have been reported following Friday
evening's 7.1-magnitude earthquake that hit near Ridgecrest, just one day after
a 6.4 magnitude quake rocked the area, CBS Los Angeles reports. Seismologists
are anticipating as many as 410 quakes of magnitude 3 or higher.
More aftershocks expected
There's a very good chance the region could get more 5
magnitude aftershocks. There is a 1 in 20 chance the region could get a bigger
earthquake. Seismologist Lucy Jones said there have been more than a thousand
aftershocks since a 6.4 magnitude quake rattled the same region on Independence
Day. That tremor is now considered a foreshock to the much larger quake Friday
night. If the 7.1 measurement sticks, it would be the largest earthquake to
shake the region in two decades.
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