Tag Archives: Tsunami

Magnitude 7.7 earthquake strikes off the coast of Jamaica


Earthquake, M 7.7 – 125km NNW of Lucea, Jamaica. Image source: USGS

Excerpts;

A magnitude 7.7 earthquake struck Tuesday about 80 miles from Jamaica, striking in the Caribbean Sea between Jamaica and eastern Cuba, shaking a vast area from Mexico to Florida and beyond…

Based on all available data, there is no significant tsunami threat from this earthquake. This appears to have been a “strike-slip earthquake,” in which tectonic plates slide against each other. This limits the threat of a devastating tsunami, which are more associated with “thrust earthquakes,” where a portion of the earth is thrust upward and causes the water to push up and outward, creating the tsunami…

Read Full Article, CNN (01-28-2020)

Mag 7.7 quake hits between Cuba and Jamaica; ABC News (01-28-2020)
A powerful magnitude 7.7 earthquake struck in the Caribbean Sea between Jamaica and eastern Cuba on Tuesday, shaking a vast area from Mexico to Florida and beyond…

New technology developed to improve forecasting of Earthquakes, Tsunamis


Photograph: © SAF – Coastal Care

Excerpts;

Geoscientists have successfully developed and tested a new high-tech shallow water buoy that can detect the small movements and changes in the Earth’s seafloor that are often a precursor to deadly natural hazards…

Read Full Article; Science Daily (11-22-2019)

Rising sea levels threatens coastal cities with more tsunamis, scientists warn; The Telegraph UK (08-15-2018)

Are We Wiser About Tsunamis? Science Daily (09-23-2015)

More People Could Survive Tsunami If They Walk Faster, ABC News (04-15-2015)

Sri Lanka wields mangroves, its tsunami shield, against climate change; MongaBay (09-22-2019)
Fifteen years after the 2004 Indian Ocean tsunami, Sri Lanka’s government intends to keep expanding the island’s coastal green belt — the chain of mangrove swamps credited with limiting the damage and destruction of the deadly waves…

Tsunamis could cause beach tourism to lose hundreds of millions of dollars every year; Science Daily (04-12-2018)
European tourists are more frequently going to places all over the world with significant tsunami risk, researchers have found. A global tourism destination risk index for tsunamis was released on April 12, at the 2018 Annual Conference of the European Geosciences Union (EGU) in Vienna…

Fukushima: Japan will dump radioactive water into Pacific

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Water tanks holding contaminated water in front of the reactor buildings at Fukushima Daiichi. February 11th, 2015. Captions And Photo source: ©© IAEA Imagebank

Excerpts;

The operator of the ruined Fukushima Daiichi nuclear power plant will have to dump huge quantities of contaminated water from the site directly into the Pacific Ocean, Japan’s environment minister has said – a move that would enrage local fishermen…

Read Full Article; The Guardian UK (09-10-2019)

New tsunami evidence along one of Earth’s largest faults, the Alaska-Aleutian megathrust


Geologist surveys the steep, coarse beach at the base of a 50 m high sea cliff along the northwest shore of Driftwood Bay, Umnak Island, Alaska. Credit: Simon Engelhart, University of Rhode Island. Courtesy: Simon Engelhart.

Excerpts;

Recent geological studies of a key section of the Aleutian Island chain of Alaska suggest Aleutian tsunamis may occur more frequently than previously understood.

The new findings indicate that the recurrence interval for large tsunamis generated in the eastern Aleutians ranges from 164 to 257 years, an important result that will inform updates to both the U.S. Geological Survey’s National Seismic Hazard Map and the tsunami source models of the NOAA-led National Tsunami Hazard Mitigation Program.

These hazard products promote community preparedness and resilience to earthquake and tsunami hazards in Alaska and in all coastal areas of the United States.

Comparing new research at Driftwood Bay, in the Fox Islands, with previous research at Stardust Bay near Dutch Harbor, some 200 kilometers (124 miles) to the east, scientists found long geologic records of earthquakes and tsunamis spanning more than a thousand years. In addition to increasing the accuracy of tsunami hazards assessments along the Alaska-Aleutian subduction zone, the findings highlight an important discovery: whether a subduction megathrust is locked or creeping today may not necessarily reflect its potential to generate large tsunamis.

These findings, published in the “Geological Society of America Bulletin” by a team of scientists led by USGS geologist Rob Witter, present strong evidence for the occurrence of eight tsunamis in the past 2,000 years at Driftwood Bay, which faces a locked section of the Aleutian subduction zone megathrust. A “locked” fault is one in which its two sides are stuck in their current position and are not moving in relationship to each other. In contrast, a “creeping” fault is one where the two sides of the fault are slowly and smoothly moving past each other, without creating earthquakes. When locked tectonic plates in a subduction zone break, the energy released can produce a giant earthquake and tsunami…

Read Full Article; USGS (03-05-2019)

Q&A: Designing a better local tsunami warning system

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Japan. Photo courtesy of © Maximilien Lebaudy

Excerpts;

New research by scientists at the School of Earth, Energy & Environmental Sciences (Stanford Earth), describes a new method designed specifically for local early tsunami warnings. “That means warning coastal residents that a tsunami wave generated 50 or 100 miles offshore is coming in the next 20 to 30 minutes”…

Read Full Article; Phys. Org (01-18-2019)

At least 168 killed when tsunami hits beaches in Indonesia

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Indonesia. Photograph: © SAF – Coastal Care

Excerpts;

A tsunami that hit Pandeglang, Serang and South Lampung, Indonesia, Saturday night, killed at least 168 people and injured at least 745, Sutopo Purwo Nugroho, head of public relations at Indonesia’s National Disaster Mitigation Agency, said on television.

He also said 30 people are missing.
The tsunami has destroyed 558 houses and heavily damaged nine hotels, 60 restaurants and 350 boats, indicating the tsunami hit residential and tourist areas…

Read Full Article; CNN (12-23-2018)

NASA Maps Indonesia Quake, Tsunami Damage


The Advanced Rapid Imaging and Analysis (ARIA) team at NASA’s Jet Propulsion Laboratory in Pasadena, California, and Caltech, also in Pasadena, created this Damage Proxy Map (DPM) depicting areas in Central Sulawesi, Indonesia, including the city of Palu, that are likely damaged (shown by red and yellow pixels) as a result of the magnitude 7.5 September 28, 2018 earthquake.

By NASA;

A 7.5-magnitude earthquake on Sept. 28 in northern Indonesia and the devastating tsunami that followed it killed more than 1,400 people and left a large trail of destruction.

This map, produced by NASA’s Advanced Rapid Imaging and Analysis (ARIA) team, shows that damage. The map covers an area of about 42 by 44 miles (67 by 70 kilometers), shown by the red polygon. Each pixel measures about 33 yards (30 meters) across. The color variation from yellow to red represents increasingly more significant ground surface change, or damage likely caused by the earthquake and tsunami.

Preliminary validation of the satellite data was done in collaboration with the Earth Observatory of Singapore by comparing with local media information and photos. Although the data is less accurate over dense vegetation, images like this one help governments and responders to identify areas that experienced significant damage and to allocate resources accordingly.

The damage proxy map was created by NASA-JPL/Caltech’s ARIA team using ALOS-2 satellite SAR data. The ALOS-2 data were provided by JAXA. The Earth Observatory of Singapore coordinated with Sentinel Asia to timely task the ALOS-2 satellite. The algorithm development was carried out at JPL under a contract with NASA.

Original Article; NASA (10-05-2018)

Tsunami sweeps away homes as power earthquakes rock Indonesia; CBS News (09-28-2018)

Tsunami sweeps away homes as power earthquakes rock Indonesia

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Indonesia. Photograph: © SAF – Coastal Care

Excerpts;

Powerful earthquakes jolted the Indonesian island of Sulawesi on Friday and a triggered a tsunami that an official said swept away houses. Indonesia had declared a tsunami warning after the strongest quake, which registered magnitude 7.5, but lifted it about half an hour later…

Read Full Article; CBS News (09-28-2018)

Tsunami hits Indonesia’s Palu after strong earthquake; BBC News (09-28-2018)

Impact of 2004 Asian tsunami could have been reduced with mangroves; Star2 (05-02-2017)