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foreshock
This term is used primarily in seismology to describe the precursor activity of a larger seismic event. It carries a connotation of warning or anticipation, though in practice, foreshocks are often only identified as such after the mainshock has occurred, as they are indistinguishable from ordinary small earthquakes at the time of occurrence.
In technical discourse, it is strictly contrasted with the mainshock and the subsequent aftershocks. While a mainshock is the largest event in a sequence, the foreshock is defined by its temporal position before that peak event.
Ý nghĩa
Ví dụ
The small tremor was later identified as a foreshock to the massive quake.
Seismologists are debating whether the initial event was a foreshock.
I hope this isn't a foreshock because the house is already shaking.
The city experienced a series of foreshocks before the main event hit.
A foreshock can sometimes provide a brief warning before a major disaster.
They felt a slight foreshock and immediately evacuated the building.
It felt like a tiny jolt, but in hindsight, it was a clear foreshock.