Abstract Since the formation of the earth, the earth's crust has been slowly drifting. When the ocean plate collides with the continental plate during the drifting process, the ocean plate will be squeezed and sinked, bringing the surface and shallow room temperature minerals to the high temperature of the earth. Scientists say that the earth's crust sinks into the earth's interior.. .
Since the formation of the Earth, the earth's crust has been slowly drifting. When the ocean plate collides with the continental plate during the drifting process, the ocean plate will be squeezed and sinked, bringing the surface and shallow room temperature minerals to the high temperature of the earth. Scientists say that the crust that sinks into the earth is a subduction zone. . The reporter learned from the Beijing High Voltage Research Center on the 9th that the researcher Chen Jiuhua of the center cooperated with the Xie Wenbin laboratory of the Central Research Institute of Taiwan in China. Recently, an article published in the Proceedings of the National Academy of Sciences stated that the temperature of the subduction zone will rise faster during the sinking process. Scientists have imagined much slower before, and the internal temperature is much lower, which makes the mechanism of deep-seismic earthquakes “return to lifeâ€.
Chen Jiuhua told reporters that the mechanism of the phase change cracking earthquake is that as the subduction zone sinks deeper, the pressure and temperature inside the earth will rise, and the reverse metastasis will occur when the metastable olivine in the subduction zone reaches the high pressure phase. This leads to an earthquake.
At first scientists believed that because of the lower temperature of the subduction zone, the rate at which the olivine transitions to the high pressure phase in the subduction zone is delayed, thereby maintaining a metastable state. A large number of metastable olivines will enter the over-band (410-660 km depth) between the Earth and the lower mantle with the subduction zone, which explains why there are a large number of deep-seismic earthquakes in this depth range. But later scientists discovered that the presence of water would greatly accelerate the rate of olivine phase transition, so there would not be a large number of metastable olivines entering the over-band, and the mechanism of phase-change cracking was questioned.
Recently, the research team used laser ultrafast time domain heat reflection and diamond to anvil high pressure technology to test the effect of high pressure water on the thermal conductivity of olivine, and found that under the excessive pressure of the earth (over 130,000 atmospheres) Water will reduce the thermal conductivity of olivine by half. This result completely overturns the perception that the olivine thermal conductivity is not affected by water.
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