Which European capital was hit by a major earthquake in 1977?

In Naples. Lying mostly un­der­wa­ter, Campi Flegrei com­pris­es 24 craters. It is one of the largest vol­ca­noes in the world, capable of pro­duc­ing VEI 7 (su­per-­colos­sal) erup­tion­s. Its most recent eruption of 1538 created a new hill, Monte Nuovo.

De­gassing of magma. The whole process begins when hot magma is lifted by con­vec­tion to the magma chamber. As the pressure in the chamber is lower than deep in Earth's crust, the gas starts to release. Since degassed magma has lower density, it may then sink and be replaced with new one. This process may build up huge pressure of gases, even­tu­al­ly causing ex­plo­sion.

Aus­trali­a. There are no active vol­ca­noes on the Aus­tralian mainland that have erupted since European set­tle­men­t, however some vol­ca­noes in Victoria and South Aus­tralia are likely to have been active and wit­nessed by Abo­rig­i­nal people several thousand years ago.

In Kaza­khstan. Baikonur Cos­mod­rome is located in the center of Kaza­khstan on the right bank of the Syr Darya river. Both the space launch facility and the neigh­bor­ing city of Baikonur are rented and ad­min­is­tered by the Russian Fed­er­a­tion.