Question

What precursory phenomena (natural events) have been observed before some large earthquakes?

Answer 1

Answer:

Predicting earthquakes is complex task and some precursors are given below.

Explanation:

• To find out the magnitude of the earthquakes the branch of science named precursory is used to study the occurrence of and identify the earthquake. Also called earthquake forecasting, some natural events that take place are given as under.

1. Changes in animal behavior: Certain animals can respond to the P-waves that are being generated.

2. Emission of Radon gas: is most rocks contain this gas, as this gas can be isotopically distinguished. It's attributed to being release pre-seismic stress or shock waves.

3. Breaking of an ice sheet or landslides: These may be issued before some large earthquake.

4. Magnetic and electric charges like the density and thickness in the rock mass.

5. Shaking and vibration of water bodies.