forearc

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onu
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A region of raised rock debris which forms between the subduction zone and any associated volcano or volcanic chain
The region between the subduction zone and the volcanic chain (volcanic arc)
The region between the trace of the subduction thrust fault and the volcanic chain (volcanic arc) Foreshocks, mainshock, aftershocks Foreshocks are relatively smaller earthquakes that precede the biggest earthquake in a series, which is termed the mainshock Aftershocks are relatively smaller earthquakes that follow the mainshock Fourier amplitude spectrum The relative amplitude at different component frequencies that are derived from a time history by Fourier analysis