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美国股市周一开盘暴跌超过7%，触动熔断机制，股市交易被迫暂停交易15分钟。

道琼斯工商指数开市交易不久就下挫超过1800点或7.29％，该指数更一度下跌2000点。标普500和纳斯达克指数也各跌7％和6.86％。

熔断机制即时被启动，股市暂停交易15分钟。恢复交易之后，三大指数的跌幅虽有收窄，仍下滑了约5％。

按照美国股市的交易机制，如果股市跌7%，那么，将触发美股第一层级的熔断机制，市场将暂停交易15分钟。如果之后价格反弹后再度下跌至13%，又将触发第二层级的熔断机制，交易将再次暂停15分钟。如果之后跌幅达到20%，当日交易将停止。