Where does the extremely destructive sand surge come from?
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recently Affected by the 6.2-magnitude earthquake in Jishishan County, Gansu Bordering Jishishan County Jintian Village and Caotan Village in Minhe County, Haidong City, Qinghai Province A secondary disaster occurred: sand surge A large amount of silt poured into two villages Some houses were destroyed Where on earth does this mud come from? Why does it keep gushing out from the ground? Sand surge diagram picture from the Internet After the earthquake Due to the vibration of the earth's crust Water-bearing sand deep underground A strong liquefaction phenomenon will be formed The soil, which was originally solid, becomes liquid. or thick liquid Under repeated shocks from external forces Liquefied sand is compressed Causes water pressure in the gap to increase Follow a certain passage directly to the surface Soil liquefaction pictures from the Internet generally Ground near water Water will seep out if you step on it And the more you step on it, the softer it gets. Even finally become like mortar or mud When this liquefaction occurs deep in the earth The liquefied soil will burst out from the cracks. The pictures of the sand surge scene come from The Paper The river ditch sediment picture comes from the Internet It is reported that At the fork in the road not far from Jintian Village There is a river The river doesn't have much water on weekdays. Except for the rainy season, the ditch is basically dry. After the earthquake Due to the high groundwater level The mud from the bottom was stirred up This ditch is wide upstream and narrow downstream. The width has been reduced from more than 20 meters to 3~4 meters As the river narrows The mud is impassable. Then overflowed into the river Jintian Village pictures are from the Internet According to experts Sand surge and water content of underground aquifer Related to the degree of extrusion deformation Not related to aftershocks The China Water Science Popularization China, CCTV News, Digital Beijing Science Center, etc. Some pictures are from the Internet. If there is any infringement, please contact us to delete them. Copywriter | Deng Wanying Review | Chen Rui Producer | Fan Yizi Editor | Wang Ziyue Proofreading | Meng Jing |
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