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India Today
16 hours ago
- Science
- India Today
Why the 6.7 magnitude earthquake in Andaman and Nicobar did not trigger a tsunami
A 6.7-magnitude earthquake shook the Andaman and Nicobar Islands on Monday night, raising concerns of a large tsunami. However, no such warning was was triggered by intricate and powerful geological processes deep beneath the seafloor. This region is globally recognised for seismic activity because it lies atop a major tectonic boundary, where the Indian Plate is gradually moving northeast and subducting under the Burma (or Sunda) This convergence is neither simple nor direct: the Indian Plate's movement occurs at an angle (called oblique subduction), introducing both compressive and shearing forces along the subduction of M: 6.7, On: 29/07/2025 03:40:32 IST, Lat: 57.90 S, Long: 157.88 E, Depth: 10 Km, Location: Macquarie Island more information Download the BhooKamp App @DrJitendraSingh @OfficeOfDrJS @Ravi_MoES @Dr_Mishra1966 @ndmaindia National Center for Seismology (@NCS_Earthquake) July 28, 2025WHAT HAPPENED BELOW THE SURFACE?The earthquake's epicenter was relatively shallow, about 10km beneath the Earth's surface. Such shallow quakes, especially in subduction zones like this one, often result in vigorous shaking at the tectonic landscape here is anything but simple; it's a broad zone marked by numerous fault types, including thrust faults where one plate pushes beneath another, and major strike-slip faults where plates slide past each other subduction dominates the area as the Indian Plate becomes squeezed and sheared as it slides both under and past the Burma Plate. This produces immense stress not only at the primary subduction interface but also along sliver faults, large strike-slip systems running parallel to the plate the Andaman-Nicobar region, many sizable earthquakes are directly linked to left-lateral strike-slip movement. When tectonic stress builds up enough to overcome friction along these faults, the rock suddenly shifts, causing an NETWORKS AND RUPTURE DYNAMICSThe Andaman and Nicobar region is crisscrossed by a complex network of faults, including large systems like the Andaman-Nicobar Fault. These accommodate both lateral (sideways) and vertical crustal movements caused by the interplay between the Indian and Burmese this leads to not just single earthquakes but clusters or swarms, as multiple segments rupture or adjust in rapid NO TSUNAMI THIS TIME?Despite its strength, this earthquake didn't generate a significant because the principal movement was horizontal, which displaces less water than vertical contrast, the catastrophic 2004 Indian Ocean earthquake involved much greater vertical movement along a 'megathrust' fault, leading to massive seabed displacement and a devastating lack of major damage can be attributed to the earthquake's remote epicentre, sparse population, primarily horizontal fault movement, and increased regional preparedness and resilient infrastructure since past outcome highlights the importance of both natural factors and human adaptation in reducing earthquake risks in seismically active but isolated regions- Ends
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First Post
a day ago
- Climate
- First Post
Earthquake of magnitude 6.3 hits Bay of Bengal near Andaman and Nicobar Islands
A strong earthquake struck the Bay of Bengal near the Andaman and Nicobar Islands early Tuesday, just days after mild tremors were felt in Delhi. While no damage has been reported. read more A powerful earthquake of magnitude 6.3 struck the Bay of Bengal near the Andaman and Nicobar Islands around 12:11 am on Tuesday, July 29. According to the National Center for Seismology, the quake occurred at a depth of 10 km, with its epicentre located at 6.82°N latitude and 93.37°E longitude. So far, no damage or casualties have been reported. This comes just a week after mild tremors were felt in Delhi and nearby areas on July 22, when a 3.2 magnitude quake struck with its epicentre in Faridabad. No harm was reported then either. STORY CONTINUES BELOW THIS AD In light of recent seismic activity, Delhi, Haryana, and Uttar Pradesh will hold large-scale disaster preparedness drills from July 29 to August 1 across the NCR. Conducted by the National Disaster Management Authority (NDMA), Indian Army, and the respective state governments, the drills aim to improve coordination during emergencies like earthquakes and chemical disasters. Meanwhile, Japan's northern Hokkaido region experienced a 5.3 magnitude quake on Monday, which rattled several districts but posed no tsunami threat. And last Friday, a 6.6 magnitude earthquake hit the South Pacific near Samoa. The deep quake caused no reported damage, according to the US Geological Survey.
Hindustan Times
a day ago
- General
- Hindustan Times
Earthquake of magnitude 6.3 strikes near Andaman and Nicobar Islands
An earthquake of magnitude 6.3 hit the Bay of Bengal, near the Andaman and Nicobar islands at around 12.11 am on Tuesday, July 29. There have been no reports of any damage or casualties so far. (Representational/Reuters) According to the National Center for Seismology, the depth of the quake of 10 km and the exact location was Latitude 6.82 N, Longitude 93.37 E. There have been no reports of any damage or casualties so far. This quake comes a week after mild tremors were felt across Delhi and the national capital region on July 22 morning. An earthquake of magnitude 3.2 struck with its epicentre in Faridabad. No damage to property or loss of life was reported. Also read: NDMA announces earthquake mock drills in Delhi-NCR during July 29 -Aug 1 To review preparedness during such disasters, Delhi, Haryana, and Uttar Pradesh have decided to conduct large-scale disaster management preparedness drills from July 29 to August 1 in the national capital region (NCR). The drills will be conducted to strengthen coordination and response mechanisms for major disasters like earthquakes and industrial chemical hazards, according to officials. These drills will be conducted by the National Disaster Management Authority (NDMA), the Indian Army and the state governments of Delhi, Haryana, and UP. Recent earthquakes On Monday, Japan's northern Hokkaido region was shook by an earthquake of magnitude 5.3 , which sent tremors through several districts and briefly startled residents, media reports said. According to the Japan Meteorological Agency (JMA), officials confirmed that despite the strength of the tremors, there was no risk of a tsunami. On Friday, an earthquake of magnitude 6.6 struck in the South Pacific near the island nation of Samoa. However, no apparent damage was caused. According to the US Geological Survey, the depth of the quake was 314 kilometres (195 miles) and it occurred 440 kilometres (273 miles) southwest of the capital Apia.
Business Upturn
22-07-2025
- Climate
- Business Upturn
Delhi-Haryana experiences another earthquake, second in 20 days
By Aditya Bhagchandani Published on July 22, 2025, 10:02 IST Residents of Delhi and Haryana were rattled early Tuesday morning (July 22) as a 3.2 magnitude earthquake struck Faridabad in Haryana at around 6 am, according to the National Center for Seismology (NCS). Tremors were felt across Delhi-NCR, though there were no immediate reports of injuries or damage to property. The earthquake occurred at a shallow depth of 5 km below the surface, with its epicentre at latitude 28.29°N and longitude 72.21°E, the NCS reported. This is the second earthquake to hit the region in just 20 days. On July 10, a 4.1 magnitude quake was recorded near Jhajjar in Haryana, close to Rohtak, at around 9:04 am, sending residents across Delhi, Gurugram, Faridabad, Noida, and other NCR cities rushing out of buildings in panic. That event, too, did not result in significant damage but highlighted the seismic sensitivity of the area. Why is Delhi prone to earthquakes? The Delhi Disaster Management Authority (DDMA) notes that Delhi lies in Seismic Zone 4, which is considered a high-risk zone. Its proximity to the Himalayan Belt, one of the most seismically active regions in the world, contributes significantly to the earthquake threat. The city sits near the boundary of the Indo-Australian Plate and the Eurasian Plate, where frequent tectonic movements occur. Additionally, the Delhi-Haridwar Ridge, a geological feature of the Indian Plate running beneath Delhi, can trigger intra-plate tremors, which, though smaller, are still strong enough to be widely felt. On July 10, the Android Earthquake Alerts System quickly notified users of the quake seconds after it struck. Residents reported feeling shaking for several seconds, which rattled furniture and swayed buildings. Safety advisory Authorities have urged residents to remain calm and adhere to earthquake safety guidelines. People are advised to avoid elevators, stay away from fragile structures, and move to open spaces in case of further tremors. Officials continue to monitor the situation closely and will provide updates if necessary. Ahmedabad Plane Crash Aditya Bhagchandani serves as the Senior Editor and Writer at Business Upturn, where he leads coverage across the Business, Finance, Corporate, and Stock Market segments. With a keen eye for detail and a commitment to journalistic integrity, he not only contributes insightful articles but also oversees editorial direction for the reporting team.
Mint
22-07-2025
- Climate
- Mint
Earthquake Today: Magnitude 3.2 tremor hits Faridabad, Haryana; tremors felt in Delhi-NCR
Earthquake Today: A mild earthquake measuring 3.2 on the Richter Scale struck Faridabad in Haryana at 6:00 am IST today, the National Center for Seismology (NCS) reported. Tremors were felt across Delhi-NCR on Tuesday morning. There were no reports of any loss of life or damage to property. The depth of the earthquake was 5 km below the surface at latitude, 28.29 degrees north and longitude 72.21 degrees east, it said. On 21 July, an earthquake hit Jammu and Kashmir's Kishtwar district in the early hours, officials said. There were no reports of any loss of life or damage to property, they said. The earthquake, with its epicentre near Kishtwar and a magnitude of 3.1, occurred at 1.36 am on Monday, the National Centre for Seismology said. In the past few weeks, the Delhi region has experienced a series of earthquakes, causing growing concern among residents. Notably, on July 10 and 11, significant tremors were recorded near Jhajjar in Haryana, just outside Delhi. A 4.4 magnitude quake struck on the morning of July 10, followed by a 3.7 magnitude tremor the next evening, both felt strongly across Delhi-NCR and neighbouring districts such as Gurugram, Rohtak, and Noida. While no major damage or injuries were reported, these seismic events unsettled the population and highlighted the region's vulnerability to earthquakes. Delhi and its surrounding areas lie above a complex network of active geological fault lines, including the Mahendragarh-Dehradun Fault, Delhi-Haridwar Ridge, Delhi-Sargodha Ridge, and others. The tectonic activity in this region is influenced both by local fault movements and the broader collision of the Indian and Eurasian plates, which create stresses along these faults. Seismologists note that the recent moderate quakes, typically ranging between magnitudes 2.0 and 4.5, reflect ongoing tectonic stress release and suggest the Mahendragarh-Dehradun Fault likely played a role in the July tremors.
