events

The 6.8 Ms  Armenian earthquake shakes the northern part of the country with a maximum MSK intensity of X (Devastating), killing 25,000–50,000 and injuring 31,000–130,000.

1988 Armenian earthquake

Devastating earthquake in Armenian SSR, USSR

The 1988 Armenian earthquake, also known as the Spitak earthquake, occurred on December 7 at 11:41 local time with a surface-wave magnitude of 6.8 and a maximum MSK intensity of X (Devastating). The shock occurred in the northern region of Armenia which is vulnerable to large…
Source: Wikipedia (CC BY-SA)

Medvedev–Sponheuer–Karnik scale

Earthquake intensity scale

The Medvedev–Sponheuer–Karnik scale, also known as the MSK or MSK-64, is a macroseismic intensity scale used to evaluate the severity of ground shaking on the basis of observed effects in an area where an earthquake transpires.
Source: Wikipedia (CC BY-SA)