If it's notable then it needs further explanation

>>4137992 (lb)

>Also, it matters what's waving. Usually we're talking about electromagnetic radiation (light, microwaves, radio signals, etc.) Not here, this is a seismic event, and what's waving back and forth is solid rock.

<Also, it matters what's waving.

>Seismic waves are waves of energy that travel through the Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy.

>The propagation velocity of the waves depends on density and elasticity of the medium.Velocity tends to increase with depth and ranges from approximately 2 to 8 km/s in the Earth's crust, up to 13 km/s in the deep mantle.

at one cycle every 17 seconds that translates to 33 ~ 220 Km wavelength (2 ~ 13 Km/s)

https://en.wikipedia.org/wiki/Seismic_wave