A recent study could predict the threat of a tsunami earlier. Namely through a magnetic field changes in sea level. For information, a tsunami produces a magnetic field when moving conductive seawater through the Earth's magnetic field. The researchers previously estimated that the magnetic field arrived before sea level changes. However, they did not have the simultaneous measurements of magnetism and sea level needed to demonstrate the phenomenon. In a recent study, there is evidence for using tsunami magnetic fields to predict tsunami wave heights. The researcher's data comes from two events, namely the 2009 tsunami in Samoa and Chile in 2010, The researcher confirmed that the magnetic field generated by the tsunami came before the sea level changed. The magnitude can be used to estimate the tsunami wave height later. In addition, how early the magnetic field arrives depends on the depth of the water, but the study found the initial arrival time was about one minute before the change in surface over the sea as deep as 4,800 meters.
"This is very interesting because in the previous study there were no sea level observations. We had observations (of) sea level changes and found that these observations matched our magnetic data and theoretical simulations," said Zhiheng Lin, senior study author and Kyoto University geophysicist. .
The researchers looked at simultaneous measurements of sea level change from data on seafloor pressure and magnetic fields in the two tsunami events. They found that the main arrival of the magnetic field could be used for tsunami early warning. The magnetic field of the so-called tsunami is very sensitive. This made the wave heights of several centimeters detectable. In addition, when the researchers compared the horizontal and vertical components of the tsunami's magnetic field with changes in sea level, it was found that both components could accurately predict tsunami sea level changes. Of note, the model provides a good estimate of the ocean depths as well as the electrical structures at the bottom of the ocean floor.
There is a more sinister threat than Covid, Asia could be submerged by the sea!
Climate change is a threat that is said to be scarier than the Covid-19 pandemic. Reportedly, Asia could also be submerged due to rising sea levels. This can be seen in the Environmental Research Letters report published some time ago. According to researchers, sea levels will rise in the coming centuries. Cities will be submerged by sea water later
"About five percent of the world's population currently lives on land below sea level, where tide levels are expected to increase due to carbon dioxide that has been added to the atmosphere by human activities," said the report's lead author, CEO and chief scientist of the study. Climate Central, Ben Strauss.
One of the areas that will be badly affected is Asia. The continent accounts for nine of the 10 major cities with high risk. A number of regions in Asia are at greatest risk. For example, homes for half the population of Bangladesh and Vietnam are below the high tide line in the long term, even for the world. There are also regions of China, India and Indonesia that face similar threats. The threat of sea level rise and risks to these regions will continue until the end of this century. Recorded sea level rise ranging from half a meter to two times. But it depends on how quickly carbon pollution decreases. Sea water will also continue to rise after 2100. Because it will be filled by melting ice sheets, heat trapped in the sea, until the dynamics of the water heats up. This even occurs when the reduction in greenhouse gas emissions is lowered. According to Strauss, the concentration of carbon dioxide (CO2) is now 50% higher than in 1800. While the average temperature of the Earth's surface is also continuing to increase by 1.1 degrees Celsius. Strauss said, with facts This sea water can rise up to two meters. However, it is not known how long it will take for this increase to occur.
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