The landslide mainly distributed in Cretacic sandrock area in Helong city.

和龙市地质灾害主要为泥石流,其次是崩滑灾害.

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It passes mainly through the purple -- color soft sandrock and mudstone in Triassic or Dyas Systems.

隧道主要通过三迭系、二迭系 紫红色 软质砂岩、泥岩岩层.

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Sound shoot in course of sandrock failure at stope top and floor is of twin - peak character.

大姚铜矿采场顶底板砂岩在破坏过程中声发射具有双峰性,主破裂前存在声发射相对平静现象.

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