And all that activity creates seismic noise, which masks delicate signals from faraway small earthquakes.

所有这些活动产生出地震噪音，掩盖了远方小型地震的微弱信号。

The relative quietness has led to what scientists call less seismic noise and that has made it easier for them to detect events like small earthquakes.

相对的安静导致了科学家们口中减少的地震噪音，这使得他们更容易探测到像小地震这样的事件。