قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ An unprecedented movement discovered in the destruction of the California earthquake, capable of reaching 8.0 timbres

An unprecedented movement discovered in the destruction of the California earthquake, capable of reaching 8.0 timbres

A major California fault that could cause an earthquake of magnitude 8 began to move for the first time as a result of this year's sequence of earthquake in Ridgecrest, destabilizing nearby faults, Caltech scientists say in a new study published in Thursday's Science magazine.

In contemporary historical record, the 160-kilometer Garlock Fault on the northern edge of the Mojave Desert has never been observed to cause either a strong earthquake or even slip – a slow movement between earthquakes that causes a visible scar on the earth's surface. But new satellite radar images show that the damage has started to move, causing a space that can be viewed from space.

"This is surprising because we have never seen Garlock's mistake in doing anything. This is where his behavior suddenly changed, "says study lead author Zachary Ross, an associate professor of geophysics at Kaltech. "We don't know what it means."

The reported observations are other evidence that illustrates the widespread myth circulating in California and beyond ̵

1; that earthquakes such as Ridgecrest's signboards are some good thing that makes future earthquakes less likely. In fact, in general, earthquakes make future earthquakes more likely. Subsequent earthquakes are smaller most of the time. But from time to time they are larger.

The creeping illustration illustrates how the Ridge Cross earthquakes that began on the Fourth of July destabilize this remote California desert region between the state's largest mountain range, Sierra Nevada, and its lowest point, Death Valley. Not only did Garlock's rift begin to creep in one section, but there was also a significant swarm of small earthquakes in another section of the fault, as well as two additional earthquake clusters elsewhere – one south of Owens Lake and the other in the valley Panamint West of Death Valley

Whether destabilization will lead to a major earthquake cannot be predicted soon. In September, a US Geological Survey said the most likely scenario was that an earthquake in Ridge Cross was unlikely to cause a major earthquake. Nonetheless, the USGS said the July earthquakes increased the chances of a magnitude 7.5 or greater earthquake in the nearby Garlock, Owens Valley, Black Water and Panamanian valleys next year.

Also, a creeping rift caused by the earthquake nearby does not necessarily mean a large earthquake. The southernmost end of the San Andreas fault has traditionally crawled in response to distant earthquakes, including an earthquake of magnitude 8.2 off the coast of southern Mexico in 2017, nearly 2,000 miles away. "But that doesn't mean San Andreas is gone," said USGS scientific geologist Kate Sharer, who is not part of the study.

The unusual thing now, Ross said, is that Garlock's fault is seismically quiet in historical record so far. And while it is unclear what the creeping and ensuing shocks for the near future may mean, the newly recorded movement underscores what part of the potential risk of Garlock's mistake for California, should it be destroyed in a big way.

Big Earthquake Garlock's mistake has the potential to send a severe shake to the San Fernando, Santa Clarita, Lancaster, Palmdale, Ventura, Oxnard, Bakersfield and Kern counties, one of the most productive regions for agriculture and oil. Important military installations can also get a major shakeup, such as Edwards Air Force Base, Lake China Navy Air Force Station and Fort Irwin National Training Center. Wines are cut off by two of Southern California's most important imported water supplies – California and Los Angeles aqueducts – and critical roads such as Interstate 5, state routes 14 and 58, and US 395.

Major Garlock fault after this, in turn, destabilizes San Andreas. A massive earthquake over a stretch of about 300 miles of the South San Andreas Fault can cause the worst shake of the Southern California area since 1857 and send devastating tremors through and beyond Los Angeles.

The study is authored by some of the country's leading Caltech earthquake experts in Pasadena and the NASA La Canada Flintridge Reactor Laboratory – operated by Caltech.

The findings confirm what some scientists expect from the Ridge Cross earthquakes. The largest earthquake in this sequence, a magnitude 7.1 event on July 5, broke along 35 miles over a series of previously unrecognized faults in 22 seconds. Its southeastern ends end only a few miles from the Garlock Fault.

Garlock's fault accumulates seismic stress among one of the faster speeds in California. According to USGS geophysicist Morgan Page, who did not participate in the study, the average time between earthquakes of at least 7 magnitudes in the central part of the fault is about every 1200 years. But there are huge variations; sometimes only 200 years can pass between large earthquakes on a fault; then, however, it may be 2000 years before the encore. The last time a major earthquake is thought to have hit the Garlock rift is about 465 years ago, give or take a century.

For some scientists, magnitude 7.1 physics on July 5 immediately suggests that the Garlock fracture is more likely to burst as a result. Here's a possible explanation: The southwestern side of the rift, which broke apart on July 5, ran northwest. This resulted in the displacement of a block of earth from Garlock's fault, its uncoupling, and facilitating the movement of earth blocks that accumulate seismic stress on both sides of the Garlock fault – as if the cyclist decided to loosen the brakes that have

satellite radar images show that the part of the Garlock Fault that started to crawl is about 20 miles long, with the earth moving north from the fault to the west while the other side moving to the east. Radar images show that one side of the fault is is a scramble the nape to the greatest extent about four-fifths of an inch relative to the other.

Scientists' assistance was in the state of the art with state-of-the-art high-resolution observations

Ridge Cross earthquakes hit an area that has a particularly extensive network of earthquake sensors near the seismically active Koso volcanic field. Inyo County, which uses magma heat to power a plant. Since the last major earthquake in southern California in 1999, more seismic stations have been installed and now there are frequent satellite radar images made from the ground.

In addition to the Garlock error, there is a reason to focus on the risks of other close faults. .

There is a line of potentially ripening fault zones along the so-called shear zone in Eastern California, one of the most significant seismic zones in the state that carries a large chunk of the earthquake burden needed to accommodate the movement of tectonic plates such as the Pacific. ocean plate slides northwest along the north american plate.

These include, in general, an unprocessed segment of about 30 miles in length between faults that broke in the 1872 earthquake of the Owens Valley and the Ridge Cross earthquakes, and another 75 mile gap along the Black Water System fault between the rifts caused by the Ridgecrest earthquakes and the magnitude of the 7.3 Landers earthquake in 1992. Someday, these fault segments will eventually have to break down to catch up with the movement of the tectonic plates, but it is unknown whether this will happened in our lifetime.

Non-study earthquake scientists called the discovery of triggered creep on Garlock's fault scientifically interesting, which should be better understood, but point out that the implications of it are not clear. Although Garlock was not observed before it escaped in response to major earthquakes, there were no other damage that occurred in major earthquakes.

"In fact, it's probably quite common, and if that's the case. That doesn't necessarily mean carrying something awful," Page said of the USGS.

Also, the observed creep was probably only a relative "What really interests us is what happens in the depths of earthquakes," says USGS seismologist Elizabeth Cochran, who did not participate in the study. Earthquakes typically occur between 1 mile and 10 miles depth; the creep calculation may have occurred at the most pl

Further research is needed to investigate whether the release of seismic energy in the form of a creep near the surface advances or slows down a subsequent earthquake, said Scharer of the USGS, in which case the amount of creep and its shallowness would have little effect on the time when the next earthquake struck Garlock's fault, Sherr said.

Sometimes large earthquakes can lead to others; a classic example was in 1992 when a magnitude 6.1 Joshua timbre tree in April was followed two months later by a 7.3 magnitude earthquake in Landers, which in turn triggered hours later a magnitude 6 earthquake, 3 Big bear; seven years later a 7.1 magnitude earthquake struck Hector Mine. But another time, a major earthquake and related aftershocks can lead to decades of seismic serenity, such as a magnitude 6.9 of the 1989 Loma earthquake.

Despite uncertainty, what is happening in this region is Watch carefully, given that Garlock's mistake is an important basic fault for Southern California. There are several major earthquakes that have been observed in California in modern times and the fact that something has not been observed in the past does not mean that it cannot happen.

In addition to Ross, the other co-authors in this study are Benjamin Idini, Zhe Jia, Oliver Stevenson, Minyang Jong, Xing Wang, Jungven Zhang, Mark Simmons, Eric Fielding, Sang-Ho Yong, Igil Huxson, Angelin Muirkson, Angelin Muirkson Liu and Jungkio Jung.

(function (d, s, id) { var js, fjs = d.getElementsByTagName (s) [0]; if (d.getElementById (id)) {return;} js = d.createElement (s); js.id = id; js.src = "http://connect.facebook.net/en_US/sdk.js"; fjs.parentNode.insertBefore (js, fjs); } (document, & # 39; script & # 39 ;, & # 39; facebook-jssdk & # 39;));
Source link