What Causes Moonquakes and How Strong Are They?

💡 The Answer

• Moonquakes are triggered by tidal stresses from Earth's gravity, meteor impacts, and thermal expansion.
• Seismometers placed by Apollo missions detected up to 5.5 magnitude quakes.
• Some deep moonquakes recur every 27 days due to tidal forces.
• Unlike Earth, moonquakes can last over 10 minutes because the Moon's crust is dry and rigid.