Meniu
Asmeninė anketa Prisijungimas ir registracija
Atgal » » » 2020 » Gruodžio » 1

Garlock fault in Southern California is slipping and could generate “massive quakes,” warn scientists

Garlock fault in Southern California is slipping and could generate

While most think of major fault lines like the San Andreas Fault when it comes to the big one even smaller faults can still pose a major earthquake hazard. According to a team of geophysicists from the California Institute of Technology (CalTech) and the National Aeronautics and Space Administration’s (NASA) Jet Propulsion Laboratory, this is because even the smallest of tremors along one fault can cause others to come to life.

The Garlock Fault, which extends for about 186 miles across Southern California, is one such fault. According to the researchers, the Garlock Fault seemed to have “awakened” after 500 years of slumber after being hit by a string of tremors from the Ridgecrest Earthquake Sequence. The latter is considered by many to be Southern California’s largest earthquake sequence in two decades.

The event began on July 4 with a magnitude 6.4 foreshock, which was followed by an even-larger mainshock that came about 34 hours later. This mainshock, experts said, had a magnitude of 7.1.

As noted by experts, while the sequence itself rattled most of Southern California, the strongest tremors were felt 120 miles or 190 kilometers north of Los Angeles near the town of Ridgecrest, hence its name.

More than 100,000 aftershocks shook the region in the following weeks, the NASA Earth Observatory said.

Earthquake sequence triggered chain reactions along faultline

As detailed in the journal Science, the tremors from the earthquake sequence triggered a chain reaction of slips and shocks along the Garlock Fault. This caused the fault itself to slip about 0.8 inches or 2 centimeters at the surface — a movement that scientists have dubbed “fault creep.” The land near the fault was also found to have moved, with the area on the west side of the fault seen to have moved by as much as 0.8 meters.

This movement, the researchers said, proves how misunderstood earthquakes are.

“It’s going to force people to think hard about how we quantify seismic hazard and whether our approach to defining faults needs to change,” Zachary Ross, an assistant professor of geophysics at CalTech said about their findings. Ross added that people should not assume that large faults are the most dangerous when it comes to seismic hazards since even smaller faults can link up to create major tremors. (Related: Scientists uncover link between low tide and earthquakes.)

The research team used data from both orbiting radar satellites and ground-based seismometers to piece together a far more complex picture of an earthquake rupture unlike those found in models of many previous large seismic events. What they found was nothing short of shocking.

According to the researchers, satellites observed the ruptures that reached the surface and the associated ground deformation extending out over 100 kilometers in every direction from the rupture, while a dense network of seismometers observed the seismic waves that radiated out from the earthquake. Together, this data allowed scientists to develop a model of subsurface fault slipping and the relationship between the major slipping faults and the significant number of small earthquakes occurring before, between, and after the two largest shocks.

Ross, in a statement, noted that the magnitude-6.4 quake simultaneously broke faults at right angles to each other. This, Ross said, came off as surprising, mainly because standard models of rock friction view this type of occurrence as being “unlikely.”

Also, the researchers also reported detecting twenty faults that hadn’t been discovered before the event itself, crisscrossing in a geometrically complex and geologically young fault zone.

According to the research team, the Ridgecrest Earthquake Sequence is proof that while massive earthquakes are likely caused by the rupture of a single long fault, major earthquakes can also be generated by smaller interconnected faults that, upon rupturing, act like cascading dominoes.

These findings, the research team said, have essentially overturned commonly-held assumptions about how major earthquakes occur.

“Over the last century, the largest earthquakes in California have probably looked more like Ridgecrest than the 1906 San Francisco earthquake, which was along a single fault,” Ross said.

Read more stories about earthquakes and other natural disasters at Disaster.news.

Sources include:

Turite savo nuomone, (už ar, prieš) pasidalinkite su mumis, palikite komentarą, prisijunkite, rašykite bloge, pasirinkdami kategoriją. Pasidalinkite savo receptais, sveikatos patarimais, nutikimais, susidūrėte su paranormaliais, anomališkais ir kitais nekasdieniškais reiškiniais. Galite išversti iš užsienio kalbos, talpinkite su nuoroda. Laukiame Jūsų straipsnių, naujienų, apžvalgų ar istorijų!

Įvertink šį straipsnį. Prieš tai pakomentuodami, arba parašykite patys! Norėdami tobulėti, suteikiame jums galimybę įvertinti skaitomą PARANORMAL turinį. Norite sužinoti daugiau, sutikite gauti naujienas arba pasidalinkite spausdami .
Niekas neišdrįso palikti komentaro.
Būkite pirmi, kurie pasidalins savo nuomonėmis su kitais.
avatar
TAIP PAT SKAITYKITE:
22.01.2021 laikas 09:58 The most important legal pathway that would allow Trump to reclaim the Presidency
If the 45th President of the United States is serious about addressing the 2020 election fraud that deprived him of another four years of service to the republic of the United States, then his legal team should begin to pursue a new legal strategy using a writ of quo warranto....

Skaityti daugiau

22.01.2021 laikas 09:47 Stop global roll out of 5G networks until safety is confirmed, urges expert
We should err on the side of caution and stop the global roll out of 5G (fifth generation) telecoms networks until we are certain this technology is completely safe, urges an expert in an opinion piece published online in the Journal of Epidemiology & Community Health....

Skaityti daugiau

21.01.2021 laikas 22:51 Situation Update, Jan 21, 2021 – The astonishing case for optimism and faith
After the staged, theatrical Biden inauguration yesterday that carries no legitimate legal standing whatsoever, people lost their minds as they fell for the spell of the fake news media that broadcast the Big Lie, in Hunger Games style....

Skaityti daugiau

22.01.2021 laikas 09:11 Imunologijos ekspertas tiesiai šviesiai: nebūkite naivūs, vakcina neapsaugos nuo COVID-19, net jei paskiepytumėte visus pasaulio gyventojus

Trejybės koledžo dubline mokslininkas imunologas ir biochemikas Kingstonas Millsas norėtų nuraminti žmonių entuziazmą dėl COVID-19 vakcinų. Jo nuomone, gali būti, kad net paskiepiję absoliučiai visus pasaulio gyventojus neatsikratytume šio viruso.

...

Skaityti daugiau

22.01.2021 laikas 08:54 Paprasčiausias būdas, kaip atskirti gripą, peršalimą ir COVID-19: atkreipkite dėmesį į ligos pradžią ir viskas taps aišku
Kaip ir kasmet šaltuoju metų sezonu į viršų šovė sergamumas virusinėmis kvėpavimo takų ligomis. Ir jei dėl karantino sergamumas mums įprastomis ligomis kiek sumažėjo, prie peršalimo, slogos ir gripo prisidėjus COVID-19, padaugėjo neaiškumų, kokia konkrečiai liga puola ir kaip gydytis....

Skaityti daugiau

22.01.2021 laikas 08:42 Tyrimas atsakė, kuo ypatingas COVID-19 sukeltas plaučių uždegimas
Tai prilygsta kelių miško gaisro židinių plitimui - pirmasis toks tyrimas atsakė, kuo ypatingas COVID-19 sukeltas plaučių uždegimas

Skaityti daugiau

20.01.2021 laikas 21:16 Pendle kalva Lankašyre
Žinomiausi raganavimo atvejai Anglijos istorijoje – tai istorijos, susijusios su Pendle kalvomis. Daugybė žmonių aplanko šias kalvas per Helouvyną. Šou „Paslaptys“ vedėjas Ivetas Fildingas prisipažino, kad kai pakildavo ant kalvų ir filmuodavo atskirus epizodus, galvoje atsirasdavo baisių minčių, ir...

Skaityti daugiau

20.01.2021 laikas 13:43 Pranešimai apie po COVID-19 skiepų mirusiuosius žmones gąsdina, bet ką iš tikrųjų žinome?
Pranešimai apie maždaug 30 mirčių tarp pagyvenusių Norvegijos slaugos namų gyventojų, kurie gavo „Pfizer“ vakciną, apskriejo visą pasaulį – ir žinoma, sukėlė susirūpinimą dėl vakcinos saugumo.

Skaityti daugiau