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The 6.0 Mw  Athens earthquake affected the area with a maximum Mercalli intensity of IX (Violent), killing 143, injuring 800–1,600, and leaving 50,000 homeless.

Historical image related to The 6.0 Mw  Athens earthquake affected the area with a maximum Mercalli intensity of IX (Violent), killing 143, injuring 800–1,600, and leaving 50,000 homeless. from September 7, 1999

1999 Athens earthquake

6.0 Mw earthquake

The 1999 Athens earthquake occurred on September 7 at 14:56:51 local time near Mount Parnitha in Greece with a moment magnitude of 6.0 and a maximum Mercalli intensity of IX (Violent). The proximity to the Athens metropolitan area resulted in widespread structural damage, mainly…
Source: Wikipedia (CC BY-SA)

Modified Mercalli intensity scale

Seismic intensity scale used to quantify the degree of shaking during earthquakes

The Modified Mercalli intensity scale measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake.
Source: Wikipedia (CC BY-SA)