Higher anti-seismic grade leads bigger adjustment coefficient of internal force, which makes design values of internal force under small earthquake be even more than those under medium earthquake.

较高抗震等级结构的内力调整系数较大，导致小震弹性设计内力放大较多，甚至超过中震的内力设计值。

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Medium-strong earthquake distribution in space and time is characterized by network and layer.

中强以上地震在时空分布上具有明显的网络性和层次性。

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Wave propagation in porous medium is an important subject in geotechnical and earthquake engineering.

多孔介质中的波的传播是岩土抗震工程中的一个重要课题。

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That would be equivalent to a medium-sized earthquake.

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Alessandro Amato of the INGV said the latest tremor "came out of nowhere", and described it as a classic earthquake for the area - "medium-strong" and "fairly shallow".

BBC: Italy: Earthquake hits near Bologna