Researchers realised that there was something weird about how earthquakes travelled through the ground. At first they thought the weirdness was due to a liquid core. This drawing proved they were half right.
Now, over thirty years later, geologists have discovered what caused a series of microquakes in Pozzuoli in 1982: A fibre-reinforced, concrete-like rock, formed in the depths of the nearby supervolcano Campi Flegrei.
Everybody’s been waving their rainbow flag recently, so it was only a matter of time before Mars got in on the fun. Admittedly, this image was painted in rainbow colours to highlight elevation changes. But I’d like to think that the progressive Martian societies of the future would agree with the colour scheme. Read more >>