Another geology question to toss out there:
Published arrival times of tsunami waves across the Pacific Ocean appear to be consistent with distances between shores portrayed on map projections within a Round Earth framework.
When a seismic event occurs, we can triangulate its epicenter through analysis of the arrival times of the different types of seismic waves recorded at seismometers at different locations on earth. From there, arrival times of tsunami waves have historically been recorded by analysis of tide gauge data at various coastal locations around the Pacific. Tsunami waves travel at ~500 mph, depending on water depth; with the waves traveling faster in deeper water than shallow water. This causes the waves to 'pile up' when they approach shorelines, increasing their height, and leading to destruction of life and property on land.
For more detailed descriptions and sources, go to the USGS, NOAA, or BGS websites, or there are many available research papers available through Researchgate.
The image below shows two separate data sets (very crudely) plotted on a standard FE map (I had to crop out big areas to get it u der max file size for display here). The first, coloured dots, are derived from this map of travel times from a 1975 tsunami originated at Hawaii (data from
https://www.ngdc.noaa.gov/hazard/data/icons/1975_1129.jpg). The source location is shown with purple dot, 5-hour travel times in red, 10-hour times in yellow, and 15-hour times in green. I decided not to drawn lines to connect those locations (as is done in the linked map for a RE).
The second set of data shows the Chilean mega thrust earthquake of 1960. The pink lines connect the source, near Santiago, to the American coast near Los Angeles and to the Northeastern New Zealand coast. Both of these locations reported tsunami wave arrivals after 14 hours.
Can someone explain these observations?