Explanation:

India is one of the highly earthquake affected countries because of the presence of tectonically active young fold mountains, Himalayas.

• India has been divided into four seismic zones (II, III, IV, and V) based on scientific inputs relating to seismicity, earthquakes occurred in the past and tectonic setup of the region.
• Previously, earthquake zones were divided into five zones with respect to the severity of the earthquakes but the Bureau of Indian Standards (BIS) grouped the country into four seismic zones by unifying the first two zones.
• BIS is the official agency for publishing the seismic hazard maps and codes. 
• Seismic waves are the vibrations from earthquakes that travel through the Earth and are recorded on instruments called seismographs.
• Seismographs record a zigzag trace that shows the varying amplitude of ground oscillations beneath the instrument.
• The earthquake events are scaled either according to the magnitude or intensity of the shock.
• The magnitude scale is known as the Richter scale. The magnitude relates to the energy released during the earthquake which is expressed in absolute numbers, 0-10.
• The intensity scale or Mercalli scale takes into account the visible damage caused by the event. The range of intensity scale is from 1-12.

Hence only statements 1&3 are correct