The big earthquake that hit Southern California in the summer has increased the burden of a larger nearby fault, causing it to move for the first time since records, the researchers said Thursday A few miles from the Garlock -Verwerfung, which runs 300 kilometers from the San Andreas Fault to Death Valley in an east-west direction. This mistake was relatively quiet for 500 years and has slowly crept in, according to a new study published in the journal Science.
"It's surprising," said Zachary Ross, assistant professor of geophysics at Caltech and principal author of the paper, said. "In California, we've been monitoring earthquakes for a long time, we think we know pretty well what is typical behavior over long periods of time, and when something unusual happens, it's obvious."
"We just do not know what that could mean, "he added 19659002] The earthquake at Ridgecrest was the largest in Southern California for two decades, starting in the Mojave Desert about 190 km north of Los Angeles on July 4. After a magnitude 6 foreshadow, 4 the following day, a magnitude 7.1 major shock followed, followed by more than 100,000 aftershocks.
The Garlock Bug is able to generate a magnitude 8 quake and is over 0.8 inches (2 cm) slipped) since July the study found by geophysicists of the California Institute of Technology and the NASA Jet Propulsion Laboratory., It moved over a sufficiently long distance of the error, hence the radar Ellit could see him in space, Ross said.
"We've never seen this mistake before," Ross emphasized, stressing that it was impossible to speculate about the movement could pose a threat to the future.
The study also found that the Ridgecrest sequence had cracks in a network of interconnected flaws. The researchers found that larger earthquakes are commonly caused by the breakage of a single long fault, but seismologists are now rethinking that model.
The Ridgecrest sequence comprised about 20 previously undiscovered bugs that intersected, providing yet another example of how big they were. Earthquakes can be created by a network of smaller "bugs" that trigger each other in a fractional event falling dominoes, "the authors said.
This means that seismologists may need to rethink how they quantify potential threats and continue to define moving flaws, Ross said:" It brings much more uncertainty … It's difficult to find all the different possible scenarios in which tiny mistakes are activated together to evoke an event … There are endless combinations. "
The study was published on the 30th anniversary of the fatal earthquake of magnitude 6 9 in Loma Prieta, which severely damaged the San Francisco Bay Area, and the same day t California has a nationwide earthquake ben early warning system for the public.
Earlier, warnings were provided to schools, government agencies, industries, and industries, but not to the general public, except for the Los Angeles County, which had an app-based system in use since January.