Slow earthquake dynamics can be observed through rock mechanics. According to the physicists organization network, an international research team composed of seismologists from Pennsylvania State University, Bremen University and other institutions in the United States can use rock mechanics methods to understand the past 5 to 10 years. Slow earthquake dynamics in mid-year, this technical method can also be used to explain the triggering of some normal earthquakes and help earthquake prediction. The research results were published in the latest issue of "Nature · Earth Science". Demian, a professor of earth sciences at Pennsylvania State University, said: "The new technology shows that faults do not collapse in sudden earthquakes but occur through stable creep. Slow earthquakes are now known to be accompanied by unusually low-frequency earthquakes, and It takes several weeks for a slow-slip event to occur. "Researchers believe that the dynamics of slow earthquakes are related to the type of rock in the fault, and it is important to see how the rock reacts through the movement of clay minerals in this glide. They conducted experiments using natural samples taken from places where a slow earthquake occurred in Japan's offshore waters. These samples were mainly marine sediments composed of clay and a small amount of quartz. The researchers said: "In the laboratory, when shearing clay-rich fault rocks, as the speed increases, the rocks become stronger and exhibit a 'self-catching' movement. But with the clay As the slip rate increases, the movement of the rock will gradually weaken. "So far, researchers have not been able to explain the process that caused the slow earthquake. The maximum effect produced in the laboratory is very close to the rate of slow earthquakes in nature. They also found that the water content in the clay affects the occurrence of shear. Researchers are more concerned about slow earthquakes because there is evidence that groups of low-frequency events may trigger large earthquakes. In Japan, the combination of broadband seismometers and global positioning systems can monitor slow earthquakes. For Japan and other earthquake-prone areas, it is extremely valuable to save lives by predicting the potential earthquake hazard a few days in advance. It is more difficult to further study the slow-slip event and collect natural samples for laboratory testing, because these faults need to appear deeper underground. The researchers are currently arranging a drill on the closed north coast of New Zealand with a view to obtaining samples of related faults.
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