I see anons working on the Nov 11 seismic event talking about frequencies, ELF, etc. In case it helps, Hz = cycles per second, so 1 cycle every 17 seconds = 1/17 Hz = 0.059 Hz = 59 mHz

Note that 59 mHz is using MILLIHERTZ as a unit of measure, not the much more commonly encountered MHz (megahertz). This event is definitely not 59 MHz!

This is far lower frequency than even ELF as commonly used. I haven't seen references to ELF used to describe frequencies under 3 Hz. Although sources define the band limits differently, we're talking under 1 Hz here, and that's amazingly low frequency!

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. Anyway, when doing research and looking at what various frequencies mean and how they're used, that's a detail to keep in mind.

I'm not sure how to convert to a wavelength. The wavelength of electromagnetic radiation is calculated using the speed of light, and you'll see that equation everywhere, but with this event it's not light doing the waving …

For what it's worth, here's a link to Wikipedia on ULF (Ultra Low Frequency). Bear in mind that the frequencies discussed here are in the 1 Hz plus range, much higher than this event.

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