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Seismograph is used to record the patterns of the seismic waves. These can be used to predict earthquakes. Two different scales are used to measure earthquakes. One of which is the Richter scale. It measures the amount of energy released. Each increase of 1 unit is 10 times stronger than the one before. The second scale is the Mercalli scale, which calculates the intensity of an earthquake by assessing the damage it causes Mercalli scale: I: Felt by very few people II: Felt by a few on upper floors III: Similar to a passing vehicle IV: Felt by many people indoors V: Buildings tremble and trees shake VI: Felt by all with cracks VII: Bricks loosen. Difficult to maintain balance VIII: Damage to weak structures IX: Pipes crack. Buildings collapse. X: Huge ground cracks. Landslides XI: Most buildings destroyed. Tsunamis XII: Total destruction. Surface waves seen Back (Damages done) | Next (Predicting) |