India, July 10 -- Tremors originating from Jhajjar (Haryana) in Delhi NCR shook the region on Thursday morning. The region experiences frequent tremors as it falls in Seismic Zone IV, the most vulnerable as per the division in India, meaning it has "fairly high seismicity".

Being a "high-risk area" thus means earthquakes in Delhi and surroundings can go up to magnitude 5-6. On Thursday, the magnitude was 4.4.

An earthquake of magnitude 7-8 is an "occasional" occurrence in Delhi.

Data available from the year 1720 says only five quakes of magnitude 5.5 to 6.7 have been recorded in Delhi or surrounding areas in this period.

The Delhi-Haridwar Ridge and Delhi-Moradabad Fault are two major lineaments that pass through Delhi and make it mor...