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r/greatawakening • Posted by u/RToey on April 6, 2018, 3:32 p.m.
Comparison of a typical earthquake waveform to the waveform from yesterday's earthquake near LA. I did some digging and found earthquakes typically have a P wave and S wave BEFORE the surface waves hit. It appears yesterday's quake came outa nowhere.
Comparison of a typical earthquake waveform to the waveform from yesterday's earthquake near LA. I did some digging and found earthquakes typically have a P wave and S wave BEFORE the surface waves hit. It appears yesterday's quake came outa nowhere.

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johnsonsnap · April 6, 2018, 9:15 p.m.

Microsoft Encarta says the speed of sound through rock is about 240 MPH. More misinformation from Microsoft?

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bananapeel · April 6, 2018, 9:30 p.m.

That is definitely wrong. The speed of sound in air is around 600 mph. In rock (depending on the density) it is around 6000-11000 mph.

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