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Mendocino Triple Junction

All articles tagged with #mendocino triple junction

science-and-tech1 month ago•259 min saved

Hidden Plates at U.S. Seismic Hotspot Could Spark Magnitude-8 Quakes

Scientists found that California’s Mendocino Triple Junction, a hotspot where three tectonic plates meet, actually comprises five moving plates (including two hidden ones). Using a network of seismometers, researchers revealed under-surface configurations and a shallower subduction zone, suggesting the area’s quake risk may be higher than previously thought and could trigger magnitude-8 earthquakes, with implications for millions in the region and offering context for past events like the 1992 Humboldt County quake.

via AOL.com|

#california-earthquakes #earthquake-risk #hidden-plates

science1 month ago•4 min saved

Five-Block Boundary at Mendocino Triple Junction Rewrites Quake Forecasts

A new analysis of tiny, low-frequency earthquakes around the Mendocino triple junction shows the boundary is made up of five moving blocks rather than three plates, with shallower subduction than previously thought, prompting updates to earthquake hazard models and potentially improving predictions for major quakes along California and Cascadia.

via ScienceAlert|

#low-frequency-quakes #mendocino-triple-junction #plate-tectonics

science1 month ago•6 min saved

Hidden fault puzzle revealed by whisper-quiet quakes off Northern California

Scientists using a dense seismometer network tracked ultra-small, low-frequency earthquakes offshore to map a five-piece fault system where the San Andreas fault meets the Cascadia subduction zone, including a deep Pioneer fragment from the Farallon plate, which helps explain the unusually shallow 1992 quake and challenges prior boundary models; the work, published in Science, improves understanding of seismic hazards in this complex region.

via ScienceDaily|

#cascadia-subduction-zone #earthquakes #mendocino-triple-junction

science1 month ago•5 min saved

Tiny Quakes Reveal a Five-Piece Tectonic Puzzle Under Northern California

Scientists report in Science (Jan 15, 2026) that undetectable low-frequency earthquakes beneath the Mendocino Triple Junction reveal a far more complex tectonic system than previously thought: five moving pieces instead of three, including a Pioneer Fragment dragged beneath the North American Plate and a subducting segment with the Gorda Plate. Using dense seismometer data and tidal triggering by the Sun and Moon, researchers formed a new five-piece model of plate interactions off Northern California, with implications for understanding seismic hazards and where fault boundaries actually lie.

via Indian Defence Review|

#farallon-plate #low-frequency-earthquakes #mendocino-triple-junction

science1 month ago•7 min saved

Tiny Quakes Reveal a Hidden Five-Piece Subduction Puzzle Under Northern California

Scientists using a dense array of seismometers tracked tiny, often imperceptible earthquakes to map five moving tectonic pieces beneath Northern California, including hidden fragments of the North American and Pioneer/Farallon blocks. The study refines the subduction-zone model around the Mendocino Triple Junction, explains a shallower-than-expected 1992 earthquake, and has implications for seismic hazard assessment along the Cascadia and San Andreas regions.

via SciTechDaily|

#cascadia-subduction-zone #low-frequency-earthquakes #mendocino-triple-junction

planet-earth1 month ago•55 min saved

Hidden plate fragment shifts quake risk at Mendocino junction

A long-lost oceanic plate fragment called the Pioneer Fragment is now stuck to the Pacific Plate at the Mendocino triple junction, moving northwest under North America and interacting with the Gorda Plate, increasing contact with the Cascadia subduction zone and potentially adding a previously unmodeled fault to regional earthquake risk models.

via Live Science|

#cascadia-subduction-zone #earthquake-risk #mendocino-triple-junction