Delhi earthquake magnitude was 4.0, but here's why the jolt was still intense

There was another earthquake in Bihar's Siwan, where a tremor of 4.0 magnitude was recorded at a depth of 10km at 8.02 am. This happened less than three hours after the quake in Delhi

Delhi earthquake Residents rush out of their houses as earthquake tremors hit Delhi-NCR | PTI

The National Capital saw an earthquake of 4.0 magnitude rattling parts of the city on Monday morning around 5.36 am.

No casualties or damage to properties were reported. The Delhi Police have urged citizens to call 112 helpline in case of emergencies.

The residents recalled hearing a loud noise. In Ghaziabad, people from high-rises rushed out following the tremors.

Why was Delhi earthquake so intense?

The epicentre of the earthquake was in New Delhi and this had increased the intensity of the tremors despite the low magnitude. The Delhi-NCR region is also part of an active seismic zone.

In this case, the epicentre was near Durgabai Deshmukh College of Special Education in Jheel Park, Dhaula Khan. According to the National Centre for Seismology, the quake hit at a depth of five kilometres.

The epicentre is calculated using seismic records from three nearby stations. For this, the time lag between the arrival of the P and S waves are used to calculate the distance between the station and the epicentre.

Bihar's Siwan also saw a 4.0 magnitude earthquake, which was recorded at a depth of 10km at 8.02 am.

Dhaula Khan area has repeatedly experienced such quakes in the recent past. In 2015, a 3.3 magnitude earthquake was recorded in the locality. Reports suggest that the area witnesses low-magnitude earthquakes every two to three years.

In 2020, Delhi saw two earthquakes: a 3.5 magnitude quake on April 12, 2020 and 4.4 magnitude quake on May 10, 2020. Another earthquake jolted Rohtak on May 29, 2020.

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