An aftershock is a seismic event that follows a larger mainshock in the same general region and results from the continued adjustment of the crust to the stress changes induced by the main rupture. Aftershocks typically occur on or near the mainshock fault or on nearby faults perturbed by the stress redistribution. They exhibit characteristic temporal decay in frequency and magnitude, commonly described by Omori-type laws, and spatial clustering around the mainshock rupture zone. Aftershock sequences provide critical information on fault properties, stress transfer, and ongoing deformation, and are central to short-term seismic hazard assessment following major earthquakes.
University of Delaware geologist Jessica Warren has contributed to research that brings us one step closer to better understanding how earthquakes operate. Situated along a stretch of the equator in the Pacific Ocean, between ...
Earth Sciences
May 15, 2026
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An undersea magnitude 7.4 earthquake toppled buildings in parts of northern Indonesia, sent people fleeing from their homes, killed at least one person and generated a small tsunami Thursday.
Environment
Apr 2, 2026
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The Phlegraean Fields volcanic complex, located beneath the metropolitan area of Naples—a city of 900,000 inhabitants in Italy—has been rising increasingly since 2005, accompanied by a growing number of small earthquakes. ...
Earth Sciences
Mar 26, 2026
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Stanford researchers have created the first-ever global map of a rare earthquake type that occurs not in Earth's crust but in our planet's mantle, the layer sandwiched between the thin crust and Earth's molten core. The new ...
Earth Sciences
Feb 5, 2026
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A research team from University of Tsukuba and collaborating institutions has clarified why M9-class megathrust earthquakes recur off the Kamchatka Peninsula with an unusually short cycle of 73 years. By analyzing the rupture ...
Earth Sciences
Feb 2, 2026
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For decades, researchers thought that an October 1843 earthquake on the small Greek island of Chalke caused a powerful tsunami and led to the deaths of as many as 600 people. But a new analysis of primary accounts of the ...
Earth Sciences
Jan 22, 2026
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In April 2025, the Main Marmara Fault below the Sea of Marmara in northwestern Türkiye experienced its largest earthquake in over 60 years. In a study published in Science, a team of researchers led by Prof. Dr. Patricia ...
Earth Sciences
Dec 12, 2025
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Japan issued a megaquake advisory Tuesday after a magnitude 7.5 earthquake struck off the eastern coast of Aomori, the northernmost prefecture of Japan's main island of Honshu, and just south of the northern island of Hokkaido. ...
Environment
Dec 10, 2025
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A powerful 7.5 magnitude earthquake struck off northern Japan late Monday, injuring 23 people and triggering a tsunami in Pacific coast communities, officials said. Authorities warned of possible aftershocks and an increased ...
Environment
Dec 9, 2025
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Earthquake forecasting tools powered by AI can forecast the risk of aftershocks seconds after the initial tremor, a new study suggests. The machine learning models can forecast where, and how many, aftershocks will take place ...
Earth Sciences
Nov 24, 2025
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