Kolkata earthquake: why short but strong tremors were felt in eastern India, what caused them, and which areas are in a high-risk zone

Earthquake in Kolkata: A 5.7-magnitude earthquake near Dhaka, Bangladesh, on Friday caused noticeable tremors across Kolkata and several parts of northeastern India, according to the U.S. Geological Survey (USGS). The earthquake prompted people in multiple cities to leave their homes and offices as a security measure. The quake occurred at 10:08 a.m. at a depth of 10 kilometers, making it a surface event. Shallow earthquakes tend to cause stronger shaking as seismic waves travel a shorter distance to the surface. Why did Kolkata experience short but strong tremors? Brief but strong tremors were felt in eastern India because the earthquake that struck Bangladesh was shallow and close to the northern border of the region. The US Geological Survey said the earthquake measured 5.7 and occurred at a depth of 10 kilometers near Narsingdi. Shallow earthquakes send stronger shaking to nearby areas as seismic waves travel a shorter distance to the surface. Cities like Kolkata, Guwahati, Agartala and Shillong are close enough to active fault zones in Bangladesh to feel the impact even when the epicenter lies outside India. Earthquake in Kolkata: Cities that felt the tremors In Kolkata, residents felt short tremors around 10:10 a.m., and many described the tremor as lasting only a few seconds. People in many neighborhoods and surrounding areas went outside as a precaution. Videos showing ceiling lights moving and people gathering in the streets quickly spread on social media.

Initial reports said that people in Guwahati, Agartala and Shillong also felt mild tremors around the same time. The authorities said that there were no immediate reports of injuries or damage in any of the affected cities.

Live Events Cause of tremors in Kolkata: Recent seismic activity in Bangladesh Bangladesh witnessed a 3.4 magnitude earthquake in October, according to the National Center of Seismology (NCS). Globally, earthquakes occur roughly every 30 seconds, although most are too weak for people to feel them, the Daily Star noted, citing USGS data. Why is the region prone to earthquakes? Bangladesh lies at the intersection of the Indian, Eurasian and Burmese tectonic plates. The Indian plate is moving northeast at a rate of 6 cm per year, while the Eurasian plate is moving north at about 2 cm per year. Several major faults – the Bogura, Tripura, Dukki and Assam faults, along with the Shillong Plateau – pass through the region, placing it among 13 designated earthquake-prone zones. risks) and Zone V (very high damage risk). Specifically, the eastern districts of Jalpaiguri and Cooch Behar fall in the fifth zone. Darjeeling, North and South Dinajpur, Malda and 24-Parganas (North and South) fall in Zone IV. Districts like Kolkata, Murshidabad, Birbhum, Bardhaman, Hooghly, Howrah, Nadia, Bankura, Midnapore fall in zone III (moderate risk). Northeast India. The entire northeast of India (states like Assam, Arunachal Pradesh, Meghalaya, Nagaland, Manipur, Tripura, Mizoram) is classified in seismic zone V, the most dangerous zone in India. In Assam in particular, almost the entire state falls in Region V. One of the major tectonic features is the Shillong Plateau and the Dawki Fault (along its southern border), which contribute significantly to seismic hazard in parts of northeastern India. Other high-risk areas / Eastern India According to risk mapping, parts of the Indo-Gangetic Plain, including northwest Bengal, are classified as Zone IV.

These areas are vulnerable due to their proximity to active fault lines and their geological structure.

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