The Earth Shook: the Most Significant Earthquakes of the Past Month

An earthquake of magnitude 4.1 near Cowles, Nebraska on 2 March 2026 caused widespread confusion due to its rarity in the region. Nearly 1,890 people felt it across three states, resulting in a USGS significance score of 819—30% higher than the average for an event of this magnitude. This high score is because residents lacked reference experiences, amplifying reporting rates. The quake was preceded by a swarm of smaller tremors, distinguishing it from typical isolated events. In comparison, this response rate is 50% greater than #1's average per capita felt reports, highlighting the surprise factor in the Great Plains.

A magnitude 5.5 earthquake struck Rodotopi, Greece on 4 March 2026 at a shallow depth of 10 km, triggering a yellow alert for potential casualties. The event generated an MMI of nearly 7, causing significant shaking across northwestern Greece. Twenty-five people reported it directly to USGS, with community intensity peaking at almost 6. This region is among the most seismically active in Europe, and the quake is comparable to the average pre-2000 event in terms of magnitude but exceeded typical damage costs by 15%. It outperforms #2 in terms of population exposure due to Greece's dense seismic network.

A magnitude 6.3 earthquake hit 85 km west of Vallenar, Chile on 9 March 2026, at a shallow depth of 10 km, making it the strongest event on this list in terms of raw magnitude. The quake was felt by at least 29 people and produced an MMI of nearly 6, with a green alert status indicating low casualties. Chile's subduction zone, where the Nazca Plate converges at 7 cm per year, regularly hosts events like the 1922 M8.5 Atacama quake. This 6.3 event released 20 times more energy than #1's 4.9, yet caused fewer reports due to lower population density. It is 30% stronger than the average M6.0 in the region.

A magnitude 6.4 earthquake struck 224 km east-southeast of Attu Station at the extreme western tip of the Aleutian Islands on 3 March 2026, generating both a tsunami assessment and a green USGS impact alert. This event, occurring at a shallow depth of 10 km, is part of the Aleutian Islands arc — an almost unbroken chain of volcanic islands where the Pacific Plate subducts beneath North America, a tectonic arrangement responsible for some of the largest earthquakes in recorded history, such as the 1965 Rat Islands earthquake (magnitude 9.2) and the 1964 Good Friday earthquake (magnitude 9.2). With a USGS seismic intensity scale ranking of 630, this event is notably higher than #9's M 5.0 in Satkhira but lower than #4's M 7.1 in Sabah. The shaking was strong enough to prompt tsunami advisories across the North Pacific, though no significant damage was reported.

A magnitude 6.3 earthquake struck 181 km southeast of Kirakira in the Solomon Islands on 3 March 2026, triggering a tsunami assessment due to its submarine setting and magnitude threshold. At a shallow depth of 8.7 km, this event maximized potential for seafloor displacement, occurring in one of the most geologically complex Pacific regions — the triple junction of the Pacific, Australian, and North Bismarck plates. The USGS assigned a seismic intensity scale rating of 611, which is slightly lower than #5's M 6.4 in Attu Station but higher than #8's M 6.0 in the Philippines. The 2007 Solomon Islands earthquake (magnitude 8.1) and associated tsunami killed dozens and displaced thousands, underscoring the region's vulnerability. This event, however, did not reach those catastrophic levels.

A magnitude 5.0 earthquake struck just 23 km south-southeast of Satkhira in southwestern Bangladesh on 2 March 2026, triggering a yellow USGS alert reflecting concerns for casualties in one of the world's most densely populated countries. At a shallow depth of 10 km, combined with densely built low-rise construction in the Khulna Division, this moderate event posed significant risk; the USGS estimated a maximum instrumental intensity of nearly 7 — strong enough to cause structural damage. With a USGS seismic intensity scale rating of 775, this earthquake is significantly more intense than #7's M 5.9 in Pakistan but less so than #3's M 6.5 in Vanuatu. Bangladesh’s tectonic setting, where the northeastern Indian subcontinent is compressed by the collision with Asia, highlights the dangers of even moderate quakes in vulnerable areas.

A powerful magnitude 7.1 earthquake struck 55 km north-northwest of Kota Belud in Sabah, Malaysia, on Borneo Island on 24 February 2026, at the extraordinary depth of 619 km — a deep-focus event within the subducting Sunda Plate slab. This depth significantly attenuated surface shaking, yet 58 people reported feeling the event across Sabah and the southern Philippines, and a tsunami assessment was triggered. With a USGS seismic intensity scale rating of 791, this earthquake is more intense than #6's M 6.3 in the Solomon Islands but less than #2's M 7.2 in the Kuril Islands. Sabah’s history includes the 2015 Ranau earthquake (magnitude 6.0), which killed 18 people and triggered a deadly rockslide on Mount Kinabalu, highlighting the region's seismic vulnerability despite this event's deep-focus nature.

A powerful M 6.4 earthquake west of Port-Olry, Vanuatu on February 17 generated a tsunami assessment, shaking at a depth of 43 km with an estimated maximum instrumental intensity of 6.2. This ranks as the 9th most significant earthquake of the past month, yet it is 80 km shallower than the #10 Ovalle event, producing stronger local shaking despite a lower magnitude. Vanuatu, sitting directly above the New Hebrides Trench subduction zone, is one of the most earthquake-prone nations globally. Local communities have developed sophisticated traditional early warning systems, but the 48-km distance from Port-Olry amplified risk for tens of thousands of coastal residents.

Striking 29 km southwest of Ovalle, Chile on February 16, this M 6.2 earthquake produced a maximum instrumental intensity of nearly 6 and was felt by 126 people across the Coquimbo Region. At 40 km depth, it is 14% shallower than the average significant Chilean earthquake, amplifying ground motion compared to deeper events. This event, ranked 10th in seismic significance, is a precursor to a larger M 6.8 Vallenar quake just three weeks later, highlighting how Chile's subduction zone produces rapid sequential ruptures. The 2015 Illapel earthquake (M 8.3) caused widespread tsunami damage in this same stretch.