震中附近的岩石的成分会影响地震的影响?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 08 - t03:08:29z //www.hoelymoley.com/feeds/question/12658 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/12658 2 震中附近的岩石的成分会影响地震的影响? 第二个风 //www.hoelymoley.com/users/11459 2017 - 11 - 13 - t11:56:26z 2017 - 11 - 14 - t11:27:54z < p >除了地震引发快速粘土滑坡,还有什么值得注意? < / p > //www.hoelymoley.com/questions/12658/-/12671 # 12671 1 答案由user11318震中附近的岩石的成分会影响地震的影响? user11318 //www.hoelymoley.com/users/0 2017 - 11 - 14 - t11:27:54z 2017 - 11 - 14 - t11:27:54z < p >土壤和岩石类型是一个因素,决定了放大的摇晃。一般来说,软底层材料振动越大。这个表,从美国地质调查局,介绍了5的速度在旧金山海湾地区土壤类型及其剪切速度。< / p > < blockquote > < p >土壤类型Vs > 1500米/秒的包括未风化的侵入性的火成岩。很少发生在海湾地区。我们认为它与B型(A和B是由地图上的蓝色)。土壤类型A和B不贡献极大地震动放大。< / p >

Soil type B 1500 m/sec > Vs > 750 m/sec Includes volcanics, most Mesozoic bedrock, and some Franciscan bedrock. (Mesozoic rocks are between 245 and 64 million years old. The Franciscan Complex is a Mesozoic unit that is common in the Bay Area.)

Soil Type C 750 m/sec > Vs > 350 m/sec Includes some Quaternary (less than 1.8 million years old) sands, sandstones and mudstones, some Upper Tertiary (1.8 to 24 million years old) sandstones, mudstones and limestone, some Lower Tertiary (24 to 64 million years old) mudstones and sandstones, and Franciscan melange and serpentinite.

Soil Type D 350 m/sec > Vs > 200 m/sec Includes some Quaternary muds, sands, gravels, silts and mud. Significant amplification of shaking by these soils is generally expected.

Soil Type E 200 m/sec > Vs Includes water-saturated mud and artificial fill. The strongest amplification of shaking due is expected for this soil type.

The slower the shear wave velocity, the greater the shaking.

Source: https://earthquake.usgs.gov/hazards/urban/sfbay/soiltype/

Additionally, the composition of the rock that the seismic waves are travelling through is a major factor in determining the speed of the waves. Two rock properties that determine the speed of the waves are reflection and refraction:

Reflection

Reflection

When a wave encounters a change in material properties (seismic velocities and or density) its energy is split into reflected and refracted waves.

Refraction

Refraction

Source: http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/waves_and_interior.html

There are many factors involved in determining the magnitude of an earthquake with underlying sediments and rock being one of the major factors. This is not an exhaustive list of all those factors but hopefully it points you in the right direction for an answer to your question.

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