软层
定义
一个建筑楼层（通常是地层）显著弱于上面的楼层，通常由于大的开口（如车库或店铺）。软层是最常见的倒塌机制。
示例
1994年北岭地震摧毁了200多栋软层公寓楼。
相关术语
相关指南
软层问题:某些建筑物为何坍塌
Soft story buildings with open ground floors are deadly in earthquakes. Learn how to identify them and what retrofitting options exist.
如何评估建筑物的抗震安全性
Learn to assess your building's earthquake vulnerability. A practical guide to identifying structural risks and when to hire a professional.
为你的家加固抗震
Earthquake retrofitting strengthens your home's foundation and framing. Learn the most effective upgrades and their costs for homeowners.
大地震后建筑规范的演变
Every major earthquake reveals building failures that reshape building codes. Trace the evolution of seismic design standards from 1906 to today.
1995年神户地震:唤醒日本的事件
The 1995 M6.9 Kobe earthquake exposed critical flaws in Japan's earthquake preparedness, killing 6,400 and transforming building codes.
1989年洛马普里埃塔地震:世界大赛地震
The 1989 M6.9 Loma Prieta earthquake struck during the World Series, collapsing freeways and exposing soft-story building dangers.
没有地震保险的真实成本
Without earthquake insurance, homeowners face financial ruin. Calculate the real cost of going uninsured in a seismically active area.
加州的大地震:区分事实与虚构
California's Big One is real science, not science fiction. Learn what seismologists actually predict and how California is preparing.
建筑物在每次地震中都会像煎饼一样坍塌吗?
Pancake collapse is dramatic but specific to certain building types. Learn which structures are vulnerable and how modern codes prevent collapse.
使你的家抗震:逐房间指南
Protect your home from earthquake damage with this room-by-room guide to securing furniture, appliances, and structural weak points.
相关案例研究
2023年土耳其-叙利亚地震:造成59,000人死亡的双重主震
The deadliest earthquake disaster of the 2020s, notable for its unprecedented double mainshock sequence and the subsequent criminal prosecution of contractors for building code violations.
2010年海地地震:7.0级地震如何造成316,000人死亡
The deadliest earthquake relative to magnitude in modern history, demonstrating that building quality and governance -- not earthquake size -- determine whether people live or die.
1995年神户地震:改变日本建筑规范的灾难
The earthquake that exposed fatal weaknesses in Japan's pre-1981 building stock, leading to the most sweeping seismic engineering reforms in history and proving that building codes save lives.
1994年北岭地震:美国历史上最昂贵的地震
America's most expensive earthquake, which revealed that thousands of modern welded steel moment-frame buildings had suffered hidden brittle fractures in their connections.
1989年洛马普里埃塔地震:唤醒加州的世界大赛地震
America's first live-televised earthquake, broadcast to 62 million World Series viewers, whose Cypress Freeway collapse catalyzed California's seismic retrofit program for elevated highways.
常见问题解答
震中是地表上位于震源（地震破裂开始处）正上方的点。通常以经纬度坐标报告。最强的震动通常发生在震中附近，但当地土壤条件和断层几何形态可能使最大损害区域发生偏移。
地震仪（地震计）是检测和记录地震波引起的地面运动的仪器。现代宽频带地震仪可以检测到比原子宽度还小的运动。全球地震仪网络使科学家能够在几分钟内确定地震的位置和震级。
P波（纵波）是通过岩石传播最快的压缩波，最先到达地震台站。S波（横波）到达较晚但引起更大的地面震动。P波可以通过固体、液体和气体传播；S波只能通过固体传播。两者之间的时间差有助于确定地震的距离。
震源是地球内部地震破裂开始的点。它由经度、纬度和深度来描述。震源与其正上方地表之间的垂直距离即为地震深度，这对地表感受到的震动强度有很大影响。
地震学是研究地震和地震波在地球内部传播的科学学科。它包括地震检测、定位和特征描述、地球内部结构、地震危险性评估和地震工程。地震学家利用全球地震仪网络的数据来研究这些现象。