The best of EcoWatch, right in your inbox. Sign up for our email newsletter!
Tectonic Plates Reverse Their Movement Before Major Earthquakes
By Fabian Schmidt
Researchers have discovered an interesting similarity in two of the largest recent earthquakes in Japan and Chile: a strange large-scale ground movement back and forth in the months leading up to the quake.
These earthquakes are among the 10 strongest ever measured: the 2011 Tohoku-oki seaquake off the coast of Japan registered 9.0 on the moment magnitude scale, triggering the devastating tsunami that destroyed the Fukushima Nuclear Power Plant. It was the fourth-strongest quake in the last 100 years. The 2010 seaquake off the coast of the Maule region of Chile, occupies sixth place on the list.
Researchers from the Geoforschungszentrum Potsdam (GFZ) along with collaborators from Chile and the United States have now discovered astonishing similarities in the months before both quakes: multiple strange reversals of ground motion — an extremely slow "wobbling" of the continental plate, so to speak.
Lead author, geophysicist Jonathan Bedford, along with a team of geodesists, geologists and seismologists, evaluated the movements of ground stations of the Global Navigation Satellite System (GNSS).
These ground stations continuously track the distances to multiple GNSS satellites that orbit the earth in elliptical orbits. After these distances have been established, and given the estimates of the satellite positions, geodesists are able to define the motion of points on the Earth within a terrestrial reference frame.
In Japan, there is a very dense network of ground stations. Although the network in Chile was not as dense in 2010, it was sufficient to obtain the data.
Whole Continental Plate 'Wobbles'
Bedford and his colleagues analyzed how the ground stations in Japan and Chile had moved in the five years before the two quakes. They noticed that the motion of the continental plate on which the stations are located had been reversed several times in the last five months before the quake (in the case of Japan) and seven months (in the case of Chile). The researchers published their results in the scientific journal Nature.
Both plate boundaries are subduction zones. Subduction is the process of one plate diving under another. In both study regions, the oceanic plates are subducting underneath the continental plates and meet at a place called the trench, which for both cases is submerged under the ocean. Normally, the continental plate is pressed by the oceanic plate and thus pushed away from the trench. However, the geophysicists have now discovered that this movement was first reversed in the direction of the trench, then away from the trench, then back towards the trench again.
Same Movement Over Thousands of Kilometers
They call this phenomenon "wobbling," due to its appearance in the GNSS time series. The amplitude of this movement is not particularly great — it was only between 4 and 8 millimeters — but Bedford points out that this is significant compared to the relative plate motion that can be a few centimeters per year. Furthermore, the spatial extent of the signal extended thousands of kilometers along the plate boundaries.
"It is a common assumption that deeper subduction proceeds at a fairly constant speed in between large earthquakes," says Bedford. "Our study shows that this assumption is an oversimplification. In fact, its variability might be a key factor in understanding how the largest earthquakes nucleate."
With global satellite tracking now becoming better and better, and with accurate data available for the first time in decades, earthquake researchers have an ever-increasing ability to make such observations.
"We can now trace movements back decades," says Bedford. "In the next stage, we'd like to monitor the changes in near real time."
Not Suitable as an Early Warning System
Until now, seismologists have been more able to say where large earthquakes are likely to occur — less able to say when. By simply calculating the magnitude of the last large earthquake in a region and knowing the average relative plate velocity, one can estimate when that fault will be mature enough to sustain a repeat event, although there are great uncertainties in this approach. This is because sometimes a fault will rupture only over a smaller area (e.g. with a "large" magnitude 8 event) and other times it will rupture over many magnitude 8 regions all at once (e.g. in a "mega" magnitude 9 event).
Could an observed untypical plate movement therefore give us a better warning of an imminent earthquake? Not really.
"It would not be wise for a geophysicist to issue such a warning," is Bedford's sobering answer. "The observed signals of this study are not necessarily precursory movements of a major quake."
More research is necessary and as a matter of principle, people in known earthquake areas should not let their guard down.
"The general public should always be prepared," Bedford warns.
Reposted with permission from Deutsche Welle.
EcoWatch Daily Newsletter
The total number of confirmed coronavirus cases passed six million Sunday, even as many countries begin to emerge from strict lockdowns.
- New Zealand Government Wins Battle Against Coronavirus ... ›
- How to Stay Healthy at Home During the Coronavirus Lockdown ... ›
- 5 Coronavirus Technologies Being Developed by Young People ... ›
- Coronavirus: When Will the Second Wave Hit? - EcoWatch ›
By Daniel Yetman
Bleach and vinegar are common household cleaners used to disinfect surfaces, cut through grime, and get rid of stains. Even though many people have both these cleaners in their homes, mixing them together is potentially dangerous and should be avoided.
Can You Mix Bleach and Vinegar?<p>Bleach can refer to any chemical that's used to get rid of stains or disinfect surfaces. The most typical form used as a cleaner is sodium hypochlorite. By itself, bleach can damage your skin but is <a href="https://www.ncbi.nlm.nih.gov/books/NBK441921/" target="_blank">non-toxic</a> when inhaled. However, it can become potentially lethal to inhale when mixed with other household cleaners.</p><p>Sodium hypochlorite is made up of a sodium, oxygen, and chlorine atoms. When this molecule is mixed with the acetic acid in vinegar or other types of acid, it releases chlorine gas. <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">Chlorine gas</a> is extremely dangerous to human health. It's so powerful that Germany used it during World War I as a chemical weapon.</p><p>Vinegar isn't the only cleaner you need to be careful mixing with bleach. Bleach also reacts with <a href="https://www.doh.wa.gov/YouandYourFamily/HealthyHome/Contaminants/BleachMixingDangers" target="_blank">ammonia</a> to create chlorine gas. Bleach can also react to some oven cleaners, insecticides, and hydrogen peroxide.</p><p>Many household cleaners contain a chemical called <a href="https://www.acs.org/content/acs/en/pressroom/presspacs/2019/acs-presspac-october-2-2019/cleaning-with-bleach-could-create-indoor-air-pollutants.html" target="_blank">limonene</a> that gives them a citrus smell. When bleach fumes mix with limonene, they create small particles that may be damaging to both people's and animals' health. However, more research is needed to examine these particles' potential health risks.</p>
Is it Safe to Mix Them in Small Amounts?<p>According to the <a href="https://www.doh.wa.gov/YouandYourFamily/HealthyHome/Contaminants/BleachMixingDangers" target="_blank">Washington State Department of Health</a>, even low levels of chlorine gas, less than 5 parts per million (ppm), is likely to irritate your eyes, throat, and nose. It's never a good idea to mix these two cleaners together.</p><p>Unlike some other dangerous chemicals like carbon monoxide, chlorine gives off a distinctly <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">pungent and irritating odor</a>. If you notice a strong smell after mixing cleaners, it's a good idea to immediately leave the area.</p><p>The <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3136961/" target="_blank">severity of symptoms</a> you develop after breathing in chlorine gas depends on how concentrated it is, measured in parts per million (ppm), and how long you inhale it.</p><ul><li><strong>0.1 to 0.3 ppm.</strong> At this level, humans can smell the pungent odor of chlorine gas in the air.</li><li><strong>5 to 15 ppm. </strong>A concentration over 5 ppm causes irritation to the mucus membranes in your mouth and nose.</li><li><strong>Over 30 ppm.</strong> At a concentration higher than 30 ppm, chlorine gas can cause chest pain, shortness of breath, and coughing.</li><li><strong>Above 40 ppm.</strong> Concentrations higher than 40 ppm can cause potentially dangerous fluid build-up in your lungs.</li><li><strong>Above 430 ppm</strong>. Breathing in more than <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">430 ppm</a> of chlorine gas can be lethal within 30 minutes.</li><li><strong>Above 1,000 ppm</strong>. Inhaling chlorine gas above this level can be deadly immediately.</li></ul>
Can You Combine Bleach and Vinegar in a Washing Machine?<p>Mixing bleach and vinegar in your washing machine is also a bad idea. Chlorine gas may be released from your washing machine when you take your clothes out. It may also leave traces of chlorine gas on your clothes.</p><p>If you use bleach in your laundry, it's a good idea to wait several loads before using vinegar.</p>
Symptoms of Exposure to a Bleach and Vinegar Reaction<p>The severity of the symptoms you'll develop after chlorine exposure depends on the amount of chlorine gas you inhale. Symptoms usually start fairly quickly. <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">Most people</a> exposed to low amounts of chlorine gas recover without complications.</p><p>If your exposure to chlorine gas is relatively brief, you may notice irritation of your nose, mouth, and throat. Lung irritation may develop if you breathe in chlorine deeply.</p><p>According to the <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">Centers for Disease Control and Prevention</a>, if you accidentally breathe in chlorine, you can experience the following:</p><ul><li><a href="https://www.healthline.com/health/eye-health/sudden-blurred-vision" target="_blank">blurry vision</a></li><li>a burning sensation in your nose, throat, or eyes</li><li><a href="https://www.healthline.com/health/cough" target="_blank">coughing</a></li><li><a href="https://www.healthline.com/health/chest-pain" target="_blank">tightness in your chest</a></li><li><a href="https://www.healthline.com/health/breathing-difficulties" target="_blank">trouble breathing</a></li><li><a href="https://www.healthline.com/health/pulmonary-edema" target="_blank">fluid in your lungs</a></li><li><a href="https://www.healthline.com/health/nausea" target="_blank">nausea</a></li><li><a href="https://www.healthline.com/health/vomiting" target="_blank">vomiting</a></li><li><a href="https://www.healthline.com/health/epiphora" target="_blank">watery eyes</a></li><li><a href="https://www.healthline.com/health/wheezing" target="_blank">wheezing</a></li></ul>
What to Do if You Get Bleach and Vinegar on Your Skin or Inhaled Chlorine Gas Vapors<p>There's <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">no cure</a> for breathing in chlorine gas. The only treatment option is removing the chlorine from your body as quickly as possible and seeking immediate medical attention to treat your symptoms.</p><p>If you breathe in chlorine gas, you can follow these steps to help get the chlorine out of your system:</p><ul><li>Immediately go somewhere where you can breathe in fresh air.</li><li>Change and wash any clothes that may have been contaminated.</li></ul><blockquote><strong>MEDICAL EMERGENCY<br><br></strong>If your symptoms are severe, call 911 or the National Capital Poison Center (NCPC) at 800-222-1222 and follow their instructions.<br></blockquote><p>Spilling <a href="https://www.healthline.com/health/bleach-on-skin#first-aid" target="_blank">bleach</a> can cause irritation to your skin. You can take the following steps to reduce your chances of developing complications:</p><ul><li>Remove jewelry or clothes that came in contact with bleach and clean them after you wash your skin.</li><li>Rinse your skin with a sponge or an absorbent cloth over a sink.</li><li>Avoid touching other parts of your body such as your face while cleaning.</li><li>Seek immediate medical attention if you spill bleach in your eyes or if you burn your skin.</li></ul><p>Vinegar may also irritate your skin. Even though it's unlikely to cause any serious health complications, it's a good idea to wash vinegar off your skin to avoid any redness or soreness.</p>
Takeaway<p>Mixing bleach and vinegar creates potentially lethal chlorine gas. If you notice a pungent smell after mixing household cleaners, you should immediately leave the area and try to breathe in fresh air.</p><p>If you or somebody you know notice any symptoms of chlorine gas poisoning, it's a good idea to immediately call 911 or the NCPC at 800-222-1222<em>.</em></p>
- 8 Toxic Products You Should Not Bring in Your Home + Natural ... ›
- How to Make Your Own Natural Cleaning Products - EcoWatch ›
- 5 Green Cleaning Products for Tackling Messy Homes - EcoWatch ›
Around 500 climate activists on Saturday gathered outside the new Datteln 4 coal power plant in Germany's Ruhr region, to protest against its opening.
Climate Activists Speak Out<p>Speaking at the protest, German Fridays for Futures climate activist Luisa Neubauer said: "It's a post-factual power plant. The facts speak for themselves." She said it was a "provocation," to mark the planned coal phaseout with a new coal power plant.</p><p>"We're going to stop this power plant, we're going to bring it to a standstill, we will win this conflict," Neubauer added.</p><p>Former miners also attended the protest. "We condemn the fact that coal mining in Germany was halted and jobs were lost, only for coal now to be imported from other countries to power Datteln 4," said Sebastian Suszka, a former workers' council member.</p><p>Greta Thunberg, founder of climate activist movement Fridays for Futures tweeted that Saturday was "a shameful day for Europe.</p>
Germany's Coal Phaseout<p>Earlier this year, Germany announced a roadmap to see coal phased out, at the latest by 2038. It laid out plans for eight coal-fired power plants to be taken off the grid in 2020.</p><p>It was an important step for the largest contributor of carbon emissions in the EU — accounting for more than 22 percent of the bloc's CO2 emissions. Over a third of the electricity generated in Germany comes from burning coal.</p><p>Germany's coal commission has recommended that solutions be found for coal plants that are already built but not-yet-in-use to keep them from operating.<br></p><p>The state of North-Rhine Westphalia insisted that the additional carbon dioxide emissions from the new plant would be compensated by the closure of four other power plants.</p>
By Julia Ries
Around the world, there have been several cases of people recovering from COVID-19 only to later test positive again and appear to have another infection.
The Viral Material in Re-Positive Cases Isn’t Infectious<p>The Korean study examined 285 patients who tested positive again for the new coronavirus after they recovered from COVID-19, which had been confirmed via a negative test result.</p><p>The researchers swabbed the patients and examined the viral material to determine whether it was still actively infectious.</p><p>The team was unable to isolate live viral material, indicating that the positive diagnostic tests were picking up dead virus particles.</p><p>"[This] may speak for the fact that the virus may be dead or not be fit enough to grow — therefore the virus may not be fit enough to infect a new host," said <a href="http://www.providence.org/doctors/profile/1099717-andres-romero" target="_blank">Dr. Andres Romero</a>, an infectious disease specialist at Providence Saint John's Health Center in Santa Monica, California.</p><p>The researchers also tested 790 people who'd been in close contact with the "re-positive" patients. Of the 27 who tested positive, no cases appeared to be caused from exposure to someone who appeared to have a reinfection.</p><p>The report also found that the vast majority of recovered patients (96 percent) had neutralizing antibodies, indicating that they conferred immunity.</p><p>"Whether this is indicative of a completely protective response remains to be proven. If this study holds true, then people who have recovered can get back to work," Zapata said.</p><p>In response to the new findings, South Korea eliminated a policy requiring discharged patients to isolate for 2 weeks.</p>
Conducting and Interpreting PCR Tests<p>The tests widely used to diagnose COVID-19 are called polymerase chain reaction (PCR) tests.</p><p>The tests swab a person's nose or throat and try to pick up the virus's genetic material, or RNA.</p><p>According to <a href="https://www.cdc.gov/coronavirus/2019-ncov/hcp/faq.html" target="_blank">guidance</a> from the U.S. Centers for Disease Control and Prevention (CDC), a positive result on a PCR test doesn't "necessarily mean infectious virus is present or that the patient is contagious."</p><p>Infectious disease experts have suspected that the test kits aren't picking up actively infectious viral material in recovered patients who test positive again, but rather dead remnants of the virus.</p><p>We see this occur with other viruses, too.</p><p>"We know other viruses like parainfluenza, human metapneumovirus, or RSV [respiratory syncytial virus] may linger for months in certain patients, and that does not represent infectious state," Romero said. "Coronavirus may be the same."</p>
We Still Need to Practice Caution<p>While the findings are promising, infectious disease experts say we still need to practice caution.</p><p>More research is needed to validate these findings and determine whether they apply to distinct parts of the population, such as those who are immunocompromised.</p><p>It's common for immunocompromised patients — such as those with cancer — to continue testing positive for a virus for longer, since it takes their immune system more time to clear the virus out of their body.</p><p>"I don't think we can be 100 percent certain of whether each recovered person is no longer contagious. Again, this may differ with distinct population groups," Zapata said.</p><p>Physicians are seeing some hospitalized patients testing positive for a month after they were first swabbed for COVID-19. It's unclear whether these patients still shed infectious virus, according to Zapata.</p><p>Everyone's body mounts a distinct immune response based on their age and overall health. Different individuals will clear the virus out at different speeds, according to Zapata.</p><p>Until we have more data and a preventive vaccine, it's crucial to continue adhering to the <a href="https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html" target="_blank">safety precautions</a> laid out by the CDC.</p><p>"The reality is that moving forward, the best approach will be keeping social/physical distancing, wearing a mask, and frequent hand hygiene in order to control the spread of the virus," Romero said.</p>
The Bottom Line<p>Doctors and researchers have been unsure whether people who recover from COVID-19 who test positive again continue to be contagious, or if they could get a second infection.</p><p>New <a href="https://www.cdc.go.kr/board/board.es?mid=a30402000000&bid=0030" target="_blank">research</a> published by the Korea Centers for Disease Control and Prevention has found that recovered COVID-19 patients who test positive again aren't infectious.</p><p>The study also found that most patients who recover have neutralizing antibodies that protect them from getting sick again.</p><p>Though the study is promising, health experts say we need more data to validate the findings and determine whether they apply to all patient populations.</p>
- Asymptomatic COVID-19: Five Questions Answered - EcoWatch ›
- What Does 'Recovered From Coronavirus' Mean? - EcoWatch ›
By Samantha Hepburn
In the expansion of its iron ore mine in Western Pilbara, Rio Tinto blasted the Juukan Gorge 1 and 2 — Aboriginal rock shelters dating back 46,000 years. These sites had deep historical and cultural significance.
The destruction of a significant Aboriginal site is not an isolated incident. Puutu Kunti Kurrama And Pinikura Aboriginal Corporation