The Earth’s Shape and Size? You Can Measure it Yourself — Part 2

In my last post, I showed, using only simple arithmetic, that the observed atmospheric effects from the January 15th volcanic explosion in the Kingdom on Tonga are consistent with a round Earth. From the timing of the observed spikes in pressure, seen around the world, one can work out how long the pressure wave took … Read more

The Earth’s Shape and Size? You Can Measure it Yourself — Part 1

This week, I’ll describe how one can easily use the Jan 15th explosive volcanic eruption in Tonga to obtain strong evidence that the Earth’s a sphere and determine its circumference, using nothing more than simple arithmetic.   This illustration of scientific measurement is perfect for any science classroom, because it uses publicly accessible data, is … Read more

Geometry From Within: Evidence for a Round Earth

It’s a lot easier to map the Earth than it used to be.  Before satellites, you had to do many careful measurements of distances and directions, at many different locations around the world, and combine them all to build a picture of a world you couldn’t see.  That’s part of why maps and globes made … Read more

Is Someone Making Artificial Earthquakes under La Palma?

There’s a plot afoot. It’s a plot that involves a grid of earthquake locations, under the island of La Palma.

Conspiracy theory would be hysterically funny if it weren’t so widespread and so incredibly dangerous. Today it threatens democracy, human health, and world peace, among many other things. In the internet age, scientists and rational bloggers will have no choice but to take up arms against it on a regular basis.

The latest conspiracy theory involves the ongoing eruption of the Cumbre Vieja volcanic system on the island of La Palma. This eruption, unlike the recent one in Iceland, is no fun and no joke; it is occurring above a populated area. Over the past month, thousands of homes have been destroyed by incessant lava flows, and many more are threatened. The only good news is that, because the eruption is relatively predictable and not overly explosive, no one has yet been injured.

The source of the latest conspiracy theory is a graph of earthquakes associated with the eruption. You can check this yourself by going to and zooming in on the island of La Palma. You’ll see something like the plot below, which claims to show earthquake locations. You can see something is strange about it: the earthquakes are shown as occurring on a grid.

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