Flat Earth vs Oblate Spheroid: Earthquakes

M Bornong

Senior Member.
After a large earthquake, will the time and distance traveled by the waves generated provide evidence of a Flat Earth or a Spherical Earth?

Source: https://twitter.com/i/status/1220848056859611138

Source: https://twitter.com/IRIS_EPO/status/1220848266646036482


Below, I've selected three earthquakes from the past 10 years, large enough to be recorded by monitoring stations over a vast distance. The monitoring stations were chosen to be similar distances from the epicenters based on a global model, and similar heading, but large distance between based on a flat earth model.

July 14, 2019, 6.6M Western Australia, 05:39:23 UTC
Reporting Station: Distance from Epicenter Time of P-wave Arrival
Puerto Nateles (MG05) 12142 km 05:58+ UTC
Babbage River ((E28M) 12299 km 05:58+ UTC


November 13, 2016, 7.8 M, South Island, New Zealand, 11:02:59 UTC
Reporting Station: Distance from Epicenter Time of P-wave Arrival
Tonquist (TRQA) 9454 km 11:15:30+ UTC
Univ of Southern CA (USC) 11018 km 11:16:31+ UTC


February 27, 2010, 8.8 M, Near Coast of Central Chile, 06:34:13 UTC
Reporting Station: Distance from Epicenter Time of P-wave Arrival
Univ of Southern CA (USC) 9111 km 06:46:30 UTC
Kahutara (KHZ) 8984 km 06:46:30- UTC



Even with variations of the speed of P-waves through different mediums, I would have a hard time justifying the Flat Earth Model.

Mick West

Staff member
I remember some research on people posting "Earthquake!" or similar on twitter, and the timestamps could be correlated with the location.

Maybe something like this:

It's being used for small earthquakes, and you'd need a big one to do any calculations of the shape of the Earth.

M Bornong

Senior Member.
I remember some research on people posting "Earthquake!" or similar on twitter, and the timestamps could be correlated with the location.
The European reporting agency will often post an alert with approximate location based on web traffic before seismic reports come in.

Source: https://twitter.com/LastQuake/status/1221788477248937985

They've put out a couple of animations showing how quick they start getting reports.
Source: https://twitter.com/i/status/1221011123836682244

For a global response, it would probably take a 9.5 M or 1883 Krakatoa eruption type event, so let's hope that doesn't happen too soon.
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