All articles tagged with #earthquakes
Researchers studying the Gofar oceanic transform fault off Ecuador found that barrier zones—networks of tiny, water-filled faults—act as active brakes, using dilatancy strengthening to buffer rock and prevent runaway earthquakes. Data from two long-term ocean-bottom seismic deployments show similar behavior across fault segments, suggesting these features may regulate quake size on other oceanic faults and could improve seismic models.
A new study finds the Great Pyramid’s resilience to earthquakes comes from engineering features like the internal pressure-relieving chambers above the King's Chamber, a massive base and symmetrical geometry that dampen seismic vibrations; sensors show pyramid vibrations (2.0–2.6 Hz) differ from ground motion, reducing resonance through historic quakes.
Scientists studying the Gofar transform fault off Ecuador found fractured, seawater-filled rock zones that act as dynamic brakes, repeatedly limiting ruptures to around magnitude 6 with a remarkably regular cycle. Seafloor sensors deployed in 2008 and again from 2019–2022 recorded bursts of small quakes in barrier regions before major ruptures and quiescence afterward, consistent with a dilatancy-strengthening mechanism driven by trapped fluids. The study suggests such barrier zones actively control rupture propagation on oceanic transform faults and could inform broader models of underwater earthquakes, though these faults lie far from shore communities.
Scientists describe active ‘brake zones’ on the Gofar fault where seawater-infiltrated, porous rock temporarily amplifies tremors before a quake and then locks up to stop rupture, a dynamic barrier revealed by 2008 and 2019–2022 ocean-floor data. If such barriers are widespread, understanding them could improve earthquake forecasting, including risks on the Hayward Fault.
NASA’s SWOT satellite captured the first high-resolution, space-based track of a major Pacific tsunami from the Kuril–Kamchatka earthquake, revealing dispersive wave energy across a wide swath and challenging the traditional view that giant tsunamis travel as a single non-dispersive wave. By combining SWOT data with DART buoy measurements, researchers refined the earthquake’s source and suggested a longer southward rupture, with implications for improving real-time tsunami forecasting.
Scientists using the CASIE21 seismic program off Vancouver Island captured the Juan de Fuca plate tearing into fragments as it sinks beneath North America—a gradual, piecewise breakup with major tears (including a ~5 km drop and a ~75 km fault) that helps explain ancient plate remnants and will refine Cascadia earthquake hazard models. Despite these changes, the region remains capable of large earthquakes and tsunamis, though models will improve by incorporating the new details.
A magnitude-7.7 offshore earthquake near Iwate prompted Japan’s Meteorological Agency to issue a rare “subsequent quake advisory” covering about 182 municipalities from Hokkaido to Chiba, telling residents to be ready to evacuate as the chance of a larger quake (and a follow-on tsunami) remains higher than normal—about 1% for an 8+ event. The advisory is valid until April 27 at 5 p.m. Tsunami waves reached up to 80 cm in places, with about 172,000 people evacuated or urged to review plans. There were a few injuries, some train services resumed, and no abnormalities were reported at nuclear plants, with officials stressing continued vigilance in the days ahead.
A CCTV video of Myanmar's 2025 Mw 7.7 earthquake lets researchers directly quantify a 2.5-meter horizontal slip in 1.3 seconds, peaking at 3.2 m/s and revealing a slightly curved fault path, supporting pulse-like rupture models and highlighting the value of real-time visual data for understanding earthquake dynamics and risk.
Researchers mapped a deep, 22‑mile tear forming in the Cascadia margin offshore Vancouver Island, where the Nootka Fault Zone is ripping a fragment from the downgoing plate. The tear could progress into a slab window and alter heat and melting patterns, but it does not change the region’s megathrust hazard yet; the finding helps scientists model how ruptures might propagate through a segmented boundary.
Scientists tracing Germany’s dormant Lake Laach volcano logged over 1,000 microearthquakes in a year, mapping a buried, tilted magma reservoir that leans toward the Neuwied Basin. Using 500 sensors and a fiber-optic line, they see a crustal system likely driven by moving fluids, which could indicate pressure changes but does not prove an eruption is imminent. The study, published in Geophysical Journal International, reframes the area as an active, watch-worthy volcanic field with a new baseline for monitoring future unrest.
Scientists mapped a gravity low beneath Antarctica caused by extremely slow deep-Earth rock movements over tens of millions of years. The anomaly strengthened between about 50 and 30 million years ago, coinciding with the emergence of Antarctica’s vast ice sheets, suggesting mantle dynamics may have helped shape surface ice and sea level. Using earthquake data like a planetary CT scan and computer models, researchers reconstructed the gravity hole’s history and plan to explore how these interior processes influence climate.
New research links underwater earthquakes near the Australian Antarctic Ridge to boosted surface phytoplankton blooms by enhancing iron release from hydrothermal vents, speeding nutrient delivery to the surface and cascading through the Southern Ocean food web, with potential implications for ocean carbon uptake and climate models. The study combines decades of satellite data with seismic records and points to a surprising, faster-than-expected pathway from deep-sea fluids to surface life.
A Japanese study models the Earth’s crust and ionosphere as a coupled electric system to explore whether solar flares could subtly influence when a fault reaches rupture. The authors stress they are discussing timing, not energy, and acknowledge the idea is preliminary and contested by experts, with further validation planned.
Scientists studying Brzegi in southern Poland have identified an ancient seismic scar that reveals a previously unknown buried fault. Using airborne LiDAR, geophysical surveys, and paleoseismic trenching, researchers linked the visible fault scar to a deeper break that formed 10,000–50,000 years ago, suggesting the region’s earthquake history extends far beyond modern records and signaling a potential for rare, higher-magnitude quakes. The findings could lead to updated hazard assessments and mapping for the area.
A new study suggests that solar flares may perturb Earth’s ionosphere, altering electrostatic forces in the crust and potentially nudging faults toward earthquakes. The authors model the crust and ionosphere as connected like a leaky battery; critics say the approach is oversimplified and real geology could dampen any effect. Validation is challenging, though the researchers cite a 2024 Japan quake as possible support, emphasizing that correlation does not equal causation.