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Today, #SeismogramSaturday is actually #SpectrogramSaturday. I'm going to talk about another way that seismologists might look at seismic data.
The key background information here is that earthquake waves, like all waves, have a quality called "frequency", which describes how many times the wave oscillates per second (a unit called Hertz, or Hz).
Sound waves are a good way to explain frequency--if the air oscillates many times per second it creates a high frequency wave, which is a high note. Low frequency waves are low notes. Humans can hear in the range of about 20-20,000 Hz. Middle C is 256 Hz.
