Which of the following is/are matched correctly?
1. Earthquake's origin - seismic focus
2. Epicentre - point on earth's surface directly above seismic focus
3. S waves - similar to sound waves
4. Richter scale - severity of earthquake
A. 1, 2, 3
B. 1, 2, 3 and 4
C. 2 and 4
D. 3 and 4
Answer: Option B
P wave is like sound wave amd severity of earthquake or intensity is measured by marcallli scale. Richter scale measures the magnitude of energy realesed from the focus