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 mediumearthquake.
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。
2
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。
3
Wave propagation in porous medium is an important subject in geotechnical and earthquake engineering.