Question

What kind of wave is produced in an earthquake before the main shock wave begins?

Answer 1

Answer:

there are three kinds of shock wave

primary waves we can pass through gas liquid and solid primary wave travel faster their velocity increases as they pass through the mental

secondary waves gay travel only through solid and cannot penetrate it through the denser molten metal these wave travel along cuverd with only

long wave these are slow waves which travel along the Earth surface their motion being vertical or horizontal

Answer 2

Earthquake produces infra-sound before the main shock wave. Infrasound is a low-frequency sound. It is sound that is lower in frequency than 20 Hz (hertz) or cycles per second, the normal limit of human hearing.