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?

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


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



https://pnsn.org/outreach/about-earthquakes/eq-waves

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
FlatEarth11b.jpg
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

flatearth11a.jpg

November 13, 2016, 7.8 M, South Island, New Zealand, 11:02:59 UTC
FlatEarth9b4.jpg
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

flatearth9a.jpg

February 27, 2010, 8.8 M, Near Coast of Central Chile, 06:34:13 UTC
FlatEarth10b.jpg
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

flatearth10a.jpg

https://www.iris.edu/app/station_monitor/#Today//welcome/


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

Administrator
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:

https://www.researchgate.net/public...n_and_Earthquake_Reporting_System_Development
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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