The dramatic CCTV video from the failure slip during the recent large earthquake in Myanmar was enthusiastic about the scientist and the occasional observer when sent to YouTube. But that was on his fifth or sixth watch, Geophysicist Jesse Kears said he had seen something even more exciting.
When Kears and his colleague Yoshihiro Kaneko analyzed the video more carefully at Kyoto University, they concluded that he captured the first direct visual evidence of the curved disorder slip.
Geologists Earthquakes often observe curved Slicteninky, scratched signs formed blocks of rock moving around them during a failure. Until now, however, there was no visual evidence of a curved slip that could create these slickenlines.
Confirming video of curved failure slip can help scientists to create better dynamic models, as the disorders of the rupture, kaars and kaneko are closed in their post published in Seismic record. (See video below.)
The video comes from the CCTV security camera recording along the track of myanmar error, which ruled 28 March at an earthquake of 7.7. The camera was located about 20 meters east of the failure and was 120 kilometers from the earthquake hypocentre.
The resulting video is amazing. Movement disorder, as he had never seen before – shaking followed by a visible slip to the north on the western side of the failure.
“I saw it on YouTube an hour or two after it was recorded, and it immediately sent me a chills,” Kearse recalled. “It shows something that I think every scientist has seen desperately, and it was just there, so very exciting.”
He watched it again and again and noticed something else.
“Instead of moving directly across the video screen, they moved along a curved path that has convexes down that immediately began to ring the bells in their heads,” Kears said, “because some of my previous research specifically concerned curvature of failure slip but from geological record.”
Kears studied curved Slicteninks associated with other earthquakes, such as an earthquake of size 7.8 Kaikoura in 2016 in New Zealand and their consequences to understand how mistakes burst.
With Myanmar, “we were about to quantify movement a little more carefully to extraordinate objective quantitative information from the video than just point out to say, look, it is curved,” he said.
Scientists decided to watch the movement of objects in the video by Pixel Cross Corelation, Frame Frame. The analysis helped them measure the speed and direction of failure movement during the earthquake.
They concluded that the failure slipped 2.5 meters for about 1.3 seconds, at a maximum speed of about 3.2 meters per second. This shows that the earthquake was similar to the pulse, which is the main discovery and confirms the previous conclusions made from the seismic course of other earthquakes. In addition, most of the failure movement of the slip is slipped with a short component of slip.
The slip curves first quickly, when it accelerates to the upper speed, then remain linear, as the slip slows down, scientists found.
The formula corresponds to what the earthquake scientists have previously suggested about the curvature of the slip, that this could have occurred in part, because the tension in the disorder near the Earth’s surface is relatively low. “The dynamic tension of the earthquake, as it approaches and begins to crack a disorder near the ground, are able to cause obliqueness to move the disorder,” Kearse said.
“This temporary tension initially pushes an error from their intended course, and then it catches and does what to do, then.”
Scientists have previously concluded that the type of curvature of the slip – whether it curves in one direction or in the other – is dependent on the direction in which the rupture travels, and is in line with the northern to southern rupture of myanmar. This means that Slictenlines may record the dynamics of past earthquakes, which can be useful for understanding future seismic risks.
