Tag

Tsunami

All articles tagged with #tsunami

science17 days ago•8 min saved

Alaska’s Tracy Arm Landslide Sparks a 481-Meter Tsunami, Raising Climate-Hazard Warnings

Scientists reconstruct the August 10, 2025 Tracy Arm event: a 63.5‑million‑cubic‑meter rockslide into Alaska’s narrow fjord generated a 100‑meter breaking wave that climbed to 481 meters on the opposite shore, the second-highest tsunami on record. The extreme runup was amplified by the fjord’s confinement and linked to climate‑driven glacier retreat thinning the ice that once stabilized the slope; microseismic signals days earlier may offer precursors. No injuries occurred thanks to early‑morning timing, but rising cruise-ship traffic underscores the need for early warning systems for similar hazards.

via Ars Technica|

#alaska #climate-change #landslide

science19 days ago•6 min saved

Alaskan Glacier Collapse Unleashes 481-Meter Tsunami in Tracy Arm Fjord

A gradual retreat of the South Sawyer Glacier exposed unstable rock above Alaska’s Tracy Arm Fjord, triggering a sudden rockfall on Aug 10, 2025 that generated a 481-meter tsunami—the second-largest on record and the largest not caused by an earthquake—amplified by the fjord’s narrow geometry and a lingering seiche; scientists warn this climate-linked hazard could rise as more infrastructure enters vulnerable areas.

via The Daily Galaxy|

#climate-change #debuttressing #glacier-retreat

science20 days ago•2 min saved

Alaska's 2025 Tsunami: Second-Tallest Wave on Record

Researchers say the Aug. 10, 2025 Tracy Arm Fjord tsunami in Alaska reached about 1,578 feet, the second-tallest tsunami in history, triggered by a massive landslide from glacier retreat and warming; no injuries were reported, and the record remains the 1958 Lituya Bay event at over 1,700 feet.

via USA Today|

#alaska #climate-change #landslide

science-tech20 days ago•13 min saved

Stunning Alaska Landslide Caused a 1,580-Foot Tsunami Rise, Pushing for Early-W warning Systems

A near-record landslide at Tracy Arm, Alaska in August 2025 unleashed a tsunami that sent water 1,580 feet up the fjord wall—the second-highest on record—stripping rock from the walls as it moved down the arm. A new study from the Alaska Earthquake Center ties glacier retreat, warm ocean waters, heavy rain, and thousands of seismic tremors to this event and argues for the development of a tiered alert system that could provide time-based warnings for ships and nearby communities, though such large-scale landslide monitoring does not yet exist in the U.S. and would require cross-agency cooperation.

via The Conversation|

#alaska #landslide #science-tech

science23 days ago•32 min saved

Dinosaur-Extinction Meteor Could Have Triggered a 2.8-Mile Megatsunami

New analysis of the asteroid impact thatended the dinosaurs suggests it also spawned a megatsunami far larger than once thought: an initial wave about 1.5 km (0.93 miles) high, with later tsunamis 50–150 meters tall; in deeper waters, estimates rise to roughly 4.6 km (2.8 miles). The event dumped about 48,000 cubic miles of sediment across the Gulf of Mexico, burying parts of Mexico and the Caribbean and triggering worldwide earthquakes and volcanic activity. The Surfer Magazine piece (republished by Yahoo News) also muses how a similar event could unfold today.

via Yahoo|

#asteroid #dinosaurs #megatsunami

science23 days ago•7 min saved

SWOT Satellite Reveals New Dispersive Dynamics in a Pacific Tsunami

NASA’s SWOT satellite captured the first high-resolution, wide-area view of a Pacific tsunami from the Kamchatka quake, revealing dispersive wave energy and complex interactions not predicted by classic non-dispersive models. By combining SWOT data with DART buoy measurements, researchers refined the rupture length to about 400 km and highlighted the potential for smarter, faster tsunami forecasting, though real-time use remains a challenge.

via Indian Defence Review|

#forecasting #nasa #oceanography

science25 days ago•10 min saved

SWOT Satellite Reveals Dispersive Tsunami Patterns Across the Pacific

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.

via SciTechDaily|

#earthquakes #oceanography #satellite

world1 month ago•14 min saved

Japan braces for bigger quake as tsunami alerts ease after 7.7-magnitude tremor

A powerful 7.7-magnitude earthquake off Japan’s northeast coast triggered tsunami warnings that prompted evacuations and railway disruptions; warnings were downgraded to advisories as waves subsided, but authorities warned the risk of a larger 8.0+ quake could persist for about a week, with chances running about ten times higher than normal. No deaths have been reported, though some injuries and power outages occurred, and officials urged continued readiness amid memories of the 2011 Tohoku disaster.

via The Independent|

#earthquake #evacuations #japan

world1 month ago•3 min saved

Japan 7.7 quake triggers brief tsunami alert and mega-quake risk advisory

A 7.7-magnitude quake off northern Japan prompted a brief tsunami alert and a rare 1% advisory for a potential mega-quake in the coming days; one injury was reported, Shinkansen services were disrupted, small tsunamis were recorded, nuclear plants remained intact, and officials said the threat has since passed without a mega-quake occurring.

via ABC7 Los Angeles|

#advisory #earthquake #japan

world1 month ago•28 min saved

Japan warns of bigger quake risk after 7.7 offshore event

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.

via The Japan Times|

#earthquakes #iwate #japan

world1 month ago•3 min saved

Japan braces for possible megaquake after 7.7 quake triggers tsunami warnings

A 7.7 magnitude undersea earthquake off Japan's northeast coast prompted a tsunami warning and evacuation orders, with initial fears of waves up to 3 meters; actual waves reached about 80 cm. Tremors were felt in Tokyo and as far as Hokkaido, some trains were disrupted and power outages reported, and officials warned there is a relatively higher risk of a larger quake in the coming week, though the alert was later downgraded to a tsunami alert.

via BBC|

#earthquake #evacuation #japan

world1 month ago•2 min saved

7.5 magnitude quake off Japan triggers tsunami warning and evacuations

A magnitude 7.5 earthquake struck offshore near Iwate in northern Japan, prompting a tsunami warning for waves up to about 3 meters and urging residents to move to higher ground; authorities activated a crisis-management team and are assessing casualties and damage, with NHK reporting no immediate damage at several ports.

via Al Jazeera|

#earthquake #evacuation #iwate

world1 month ago•173 min saved

Strong offshore quake triggers Japan tsunami warning

A strong 7.4-magnitude earthquake struck off Japan’s northeastern coast, triggering a tsunami warning of up to three meters for Iwate, Hokkaido and Aomori, with smaller advisories elsewhere. Observed waves reached Kuji Port (0.8 m) and Miyako Port (0.4 m); residents were urged to evacuate to higher ground as authorities activated an emergency task force. Rail services were suspended due to outages and TEPCO reported no abnormalities at major nuclear plants. Officials cautioned the situation is developing, underscoring Japan’s ongoing seismic risk after the 2011 Tohoku disaster.

via CNN|

#earthquake #honshu #iwate

world1 month ago•11 min saved

7.5-magnitude offshore quake prompts tsunami alert off Japan

A powerful 7.5-magnitude earthquake struck offshore Japan, triggering a tsunami alert; no immediate details on damage or casualties were provided.

via AP News|

#earthquake #japan #natural-disaster

science1 month ago•18 min saved

SWOT Satellite Reveals Braided Pacific Tsunami and Forecast Implications

The SWOT satellite captured the first high-resolution, spaceborne swath of a Pacific-wide tsunami triggered by the 2025 Kuril–Kamchatka quake, revealing a braided energy pattern and dispersive waves that challenge traditional non-dispersive tsunami models; by combining SWOT data with DART sensors and seismic records, scientists revised the rupture length and underscored the need to merge multiple data streams for more accurate near-real-time tsunami forecasting.

via Earth.com|

#forecasting #oceanography #satellite