Tremor is a rhythmic, involuntary, oscillatory movement of a body part resulting from alternating or synchronous contractions of reciprocally innervated muscles, typically around a joint. Phenomenologically, tremors are characterized by their frequency, amplitude, distribution, and activation condition (rest, postural, kinetic, or intention). They arise from pathological or physiological alterations in central motor networks, particularly involving cerebello-thalamo-cortical and basal ganglia circuits, and can be modulated by peripheral feedback. Tremor is a core motor phenomenon in various neurological disorders, where its spatiotemporal features are crucial for differential characterization, quantification, and pathophysiological investigation.
A swarm of at least six earthquakes reaching up to magnitude 2.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports.
Earth Sciences
Dec 15, 2025
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Glacial earthquakes are a special type of earthquake generated in cold, icy regions. First discovered in the Northern Hemisphere more than 20 years ago, these quakes occur when huge chunks of ice fall from glaciers into the ...
Earth Sciences
Dec 14, 2025
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A 6.9 magnitude earthquake shook northeastern Japan and caused small tsunami waves but no apparent damage Friday, days after a stronger quake in the same region.
Environment
Dec 12, 2025
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Up to 30% of life, by weight, is underground. Seismic activity may renew the energy supply for subterranean ecosystems. Published in PNAS Nexus, Eric Boyd and colleagues chronicled the ecological changes in subsurface microbial ...
Earth Sciences
Nov 25, 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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Two earthquakes were recorded within hours of each other near Marion, North Carolina, and witnesses report they felt shaking miles away, according to the U.S. Geological Survey.
Earth Sciences
Oct 27, 2025
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How do volcanoes work? What happens beneath their surface? What causes the vibrations—known as tremor—that occur when magma or gases move upward through a volcano's conduits? Professor Dr. Miriam Christina Reiss, a volcano ...
Earth Sciences
Oct 13, 2025
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What lies beneath Fickle Hill in northern California? Maybe the answer to an earthquake mystery that has puzzled seismologists for decades.
Earth Sciences
Aug 20, 2025
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Scientists have uncovered a key piece of the puzzle behind the unusual "slow earthquakes" occurring off the east coast of New Zealand's North Island.
Earth Sciences
Aug 18, 2025
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On May 12, 2008, the magnitude 7.9 Wenchuan earthquake shook central China, its destructive tremors spreading from the flank of the Longmen Shan, or Dragon's Gate Mountains, along the eastern margin of the Tibetan Plateau.
Earth Sciences
Aug 13, 2025
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