Is to both prepare the relevant parties(the army,police, authorities), and to act as a deterrence. What are you crying about? It's a yearly drill. We're not testing 4,000 km missiles like Iran, we're preparing the army and the police to handle emergency situations and exercise children to reach the shelter quickly.
4.2-scale earthquake felt in Dead Sea, Jerusalem area (Haaretz)
from the article: MESS Report / No real threat of war despite Hezbollah's threats