quakes

North America may still be trembling with the aftershocks of two major earthquakes that struck the continent more than a century ago, according to new research.If the statistical inferences that scientists have made are correct, then that means some tremors of today were set in motion way back in the 1800s, after some of the most powerful quakes in the continent's recorded history.In fact, the study authors estimate that around 23 percent to 30 percent of the seismic shocks experienced in the New Madrid seismic zone…

Spatial distribution of M ≥ 2.5 earthquakes in stable North America. Blue circles are events between 1568 and 1979 (incomplete records). Red circles are events between 1980 and 2016 (complete records). The data source is provided in the text. Credit: Journal of Geophysical Research: Solid Earth (2023). DOI: 10.1029/2023JB026482 In the 1800s, some of the strongest earthquakes in recorded U.S. history struck North America's…

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Fast News Borsa Istanbul suspends trading after BIST 100 index lost more than 19 percent from last week's close due to the selloffs triggered by massive earthquakes. The magnitude 7.7 and 7.6 earthquakes, centered in the Kahramanmaras province, struck 10 provinces and affected more than…

Researchers have discovered detectable changes in the local magnetic field that occur 2-3 days before an earthquake.Magnetometers detected faint signals that may improve our understanding of what happens before earthquakes and offer promise for early detection.Scientists studying intermediate to large earthquakes in California have discovered detectable changes in the local magnetic field that occur 2-3 days before an earthquake. A recent study found that the signal of the magnetic field change is faint but statistically…

When the next big earthquake strikes somewhere around the world, it will arrive without warning, destroying infrastructure and putting lives at risk.Yet for days leading up to the event, titanic geological forces will already be at work, warping the crust in subtle ways that could, in theory, predict the coming catastrophe.One possible sign could involve flickers in the magnetic field that ebbs and flows around our planet. For decades, researchers have debated the merits of hunting for magnetic signatures to imminent…

A three-dimensional visualization shows how rock gouge can arrest a rupture (in red) but, with a combination of dynamic stressing and dynamic weakening, will ultimately re-nucleate the rupture shortly thereafter (in blue). Credit: Rubino et. al., Nature, 2022 By simulating earthquakes in a lab, Caltech engineers have provided strong experimental support for a form of earthquake propagation now thought responsible for the…

In terms of seismic events on the red planet (or indeed any other planet besides Earth), this is the biggest one recorded so far: the NASA InSight lander has recorded a 'monster' of a marsquake, which is estimated to have hit magnitude 5 on the scale used on Earth.  That beats the previous record holder, a magnitude-4.2 marsquake that Insight recorded back on 25 August 2021. The new quake happened on Mars on May 4 of this year, the 1,222nd sol (or Martian day) of the lander's mission.A magnitude-5 quake on Earth would be…

Seismogram of the June 10, 2019, magnitude 4.0 Lake Erie earthquake, recorded at the University of Michigan seismic station in Ann Arbor. Image credit: University of Michigan In June 2019, a magnitude 4.0 earthquake occurred beneath Lake Erie just off the shoreline of Ohio, about 20 miles northeast of Cleveland. …