With reference to seismic noise in geology, consider following statements

1. The Royal Observatory in Belgium has observed a 30-50 per cent fall in levels of ambient seismic noise since schools and businesses were closed in mid-March.
2. It is the unwanted component of signals recorded by a seismometer– the scientific instrument that records ground motions, such as those caused by earthquakes, volcanic eruptions, and explosions.
3. It is also studied in other fields such as oil exploration, hydrology, and earthquake engineering.

Select the correct statement.

• Recently,Seismologists of the Royal Observatory in Belgium has observed a 30-50 per cent fall in levels of ambient seismic noise since schools and businesses were closed in mid-March.
• In geology, seismic noise refers to the relatively persistent vibration of the ground due to a multitude of causes. It is the unwanted component of signals recorded by a seismometer– the scientific instrument that records ground motions, such as those caused by earthquakes, volcanic eruptions, and explosions.
• This noise includes vibrations caused due to human activity, such as transport and manufacturing, and makes it difficult for scientists to study seismic data that is more valuable.
• Apart from geology, seismic noise is also studied in other fields such as oil exploration, hydrology, and earthquake engineering.

By: Shubham Tiwari