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

P Waves
P waves are compressional waves that do not produce much damage. They can move through any type of material and travel at almost twice the speed of S waves. High frequency P waves do not weaken or attenuate as rapidly as S waves so they retain higher frequencies when they arrive at seismic stations. In air, P waves take the form of sound waves and therefore move at the speed of sound, 330m/s at sea level. Some people even report hearing an earthquake (due to the higher frequency P waves vibrating or rustling objects) before they feel the S waves arrival. Typical speeds in Earth are faster: 1450m/s in water and 5000m/s in granite.
Content from External Source

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:

Twitter has received much attention recently. An important characteristic of Twitter is its real-time nature. We investigate the real-time interaction of events such as earthquakes in Twitter and propose an algorithm to monitor tweets and to detect a target event. To detect a target event, we devise a classifier of tweets based on features such as the keywords in a tweet, the number of words, and their context. Subsequently, we produce a probabilistic spatiotemporal model for the target event that can find the center of the event location. We regard each Twitter user as a sensor and apply particle filtering, which are widely used for location estimation. The particle filter works better than other comparable methods for estimating the locations of target events. As an application, we develop an earthquake reporting system in Japan. Because of the numerous earthquakes and the large number of Twitter users throughout the country, we can detect an earthquake with high probability (93% of earthquakes of Japan Meteorological Agency (JMA) seismic intensity scale 3 or more are detected) merely by monitoring tweets. Our system detects earthquakes promptly and notification is delivered much faster than the announcements that are broadcast by the JMA.
Content from External Source
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.
Last edited:
Thread starter Related Articles Forum Replies Date
Agent K Geogebra tool to compare distances on a Flat Earth with a Globe Tools for Investigating and Debunking 1
V Needs debunking: flat earthers claim this reflection to show a harness in ISS video Flat Earth 10
R Flat Earth Claim: "The Greatest Laser Experiment In History" - FECORE Flat Earth 11
S Help: Panorama Maker and the Curvature of the Earth Flat Earth 19
J Claim sun paths prove flat earth Flat Earth 41
J Are sun shadows only possible on a flat earth? Flat Earth 5
Mick West Flat Earth and Refraction with Oil Platforms Hillhouse and Habitat Flat Earth 5
Code-Beta 300 miles visibility on Antartica? Flat Earth 2
H Illusions of Curvature - RC Boat Hidden on Small Pond Flat Earth 10
Bunkmeister Cosmonaut Miroslaw Hermaczewski allegedly says earth is flat - [joke] Flat Earth 10
Mick West TFTRH #29 - Geoff: Everything is a Hoax, The Earth Might Be Flat Tales From the Rabbit Hole Podcast 2
Cassi O Google Maps Measure Distance Using Great Circle Flat Earth 0
Mick West TFTRH #14: Rory – Flat Earth Debunking and Spiritual Journeys Tales From the Rabbit Hole Podcast 6
Wiggles Refraction Variations Over Water to Bell Island Flat Earth 27
Wiggles I could have spiralled into flat earth belief. Escaping The Rabbit Hole 36
Mick West Demonstrating the Curve of the Earth with observations of Beachy Head from Worthing Flat Earth 38
Qulaey Explained: 17.61 Mile Mirror Flash Supposedly Proves Flat Earth [Refraction] Flat Earth 5
Mick West Why Flat Earth Laser Tests are Misleading Flat Earth 16
Rory Calculator for viewing angles Tools for Investigating and Debunking 13
Rory Claim: footage of Great South Bay Bridge supports flat earth Flat Earth 11
Rory How can we explain perspective calculations simply? Flat Earth 39
chrono117 How to Debunk Flat Earth Without Relying on NASA or Photos Flat Earth 42
Mendel Debunked: Air Map of the World 1945 is a flat Earth map Flat Earth 0
T Observations of a Wind Farm Over the Curve of The Earth Flat Earth 0
Mendel Homemade Gyrocompass finds North by Spin Flat Earth 0
brad fuller Does the inverse-square law apply to the flat-earth debunking tool chest? Flat Earth 4
Rory Earth curve calculator for obstructions Tools for Investigating and Debunking 9
Rory Explained: How Mount Rainier helps demonstrate the shape of the globe Flat Earth 38
Rory Unidentified "space vehicle" Skydentify - What is that Thing in the Sky? 8
Rory Debunked: 120-mile shot of San Jacinto proves flat earth Flat Earth 39
MisterB Debunked: Isle of Man from Blackpool at water level proves flat earth [refraction] Flat Earth 19
Mick West What does the Flat Earth Look Like From Space, with Perspective? Flat Earth 19
Neil Obstat Claim: zooming in on setting sun proves flat earth Flat Earth 23
Mick West Earth's Radius Calculator (from the amount a distant object is obscured) Tools for Investigating and Debunking 0
Whitebeard Quick and easy demonstration of the shape of the Earth Flat Earth 7
I Nathan Oakley's Flat Earth "Debates". Flat Earth 69
Rory Recreating the Bedford Level Experiment Flat Earth 8
danno Using a very long water level to measure Earth's curvature Flat Earth 16
qed Third of millennials NOT convinced Earth is round Flat Earth 27
Mick West Debunking Guidelines for: "Convex Earth - The Documentary" Flat Earth 0
Nth Claim: 146 Mile Microwave Transmission Proves Flat Earth Flat Earth 26
Benjamin Moore Explained: Why Earth Has A Magnetic Core Even Though the core is Molten Metal Flat Earth 2
Mick West RT Promoting Flat Earth? Flat Earth 31
R “Flat Earth” map General Discussion 2
Rory Flat Earth debunked by measuring angles to the sun Flat Earth 38
StarGazer Claim: First Image of Space Taken from V-2 Rocket Proves the Earth is Flat Flat Earth 17
M Do Ibiza and Mallorca prove a Flat Earth? [No, they demonstrate the curve of the globe] Flat Earth 24
FlightMuj Explained: NASA documents stating a flat Earth??? Linear Aircraft Models Flat Earth 7
Mick West What Happened When Engineers Forgot The Earth Was Round Flat Earth 1
Mick West Earth Curvature Simulation by Walter Bislins Flat Earth 9
Related Articles

Related Articles