It's even cooler than that, @dbb.bsky.social! That's columnar jointing — it forms when thick lava cools, contracts, and cracks into a pattern of columns perpendicular to the cooling surface. It’s a cooling-related feature rather than flow.

Thank you for the collaboration INSIVUMEH, CONRED,
@robertomboogher.bsky.social, @pdcguy.bsky.social,
@tyranakisaurus.bsky.social, Sylvain Charbonnier, Gustavo Chigna, Fabrizio Ponce, Amilcar Calderas, Edgar Barrios, William Chigna, Mario Ovalle, Sarai Perez, @bgs.ac.uk @edinburgh-uni.bsky.social

Next try of our GIF...

also here:

www.geophysics.geol.uoa.gr/main_greek.h...

some differences in magnitudes ad depths due to different stations being used

What's the book? I'm interested too!