New research confirms the cause of slow slip along the Cascadia Subduction Zone and other faults that is accompanied by intermittent tremors or “pops” at the surface. Co-authors Marine Denolle and Joan Gomberg discuss the role of fluid-driven fracturing deep underground.
Two University of Washington geophysicists will travel to the Atacama Desert in Chile this month to study a fault system that’s similar to the Seattle Fault in Puget Sound, but in a much different climate that makes it easier to monitor its effects on the landscape.
The University of Washington is a lead partner on a new multi-institution earthquake research center that will study the Cascadia subduction zone and bolster earthquake preparedness in the Pacific Northwest and beyond.
UW oceanographers discovered warm, chemically distinct liquid shooting up from the seafloor about 50 miles off Newport. They named the unique underwater spring “Pythia’s Oasis.” Observations suggest the spring is sourced from water 2.5 miles beneath the seafloor at the plate boundary, regulating stress on the offshore subduction zone fault.
Non-erupting volcanoes leak a surprisingly high amount of sulfur-containing gases. A Greenland ice core shows that volcanoes quietly release at least three times as much sulfur into the Arctic atmosphere than estimated by current climate models. Aerosols are the most uncertain aspect of current climate models, so better estimates could improve the accuracy of long-term projections.
An underwater volcanic eruption in January 2022 created ripple effects throughout the world’s atmosphere and oceans. University of Washington scientists analyzed that event to show how GPS signals could help monitor future volcanoes and tsunamis.
A 2018 expedition that drilled farther into the seafloor than ever before — almost 2 miles — sought to take measurements of stress as close as possible to a tectonic fault off the coast of Japan. Surprisingly, the researchers found little built-up tectonic stress. The findings could help to better understand earthquakes in subduction zones around the world.
A University of Washington pilot project is exploring the use of fiber-optic sensing for seismology, glaciology, and even urban monitoring. Funded in part with a $473,000 grant from the M.J. Murdock Charitable Trust, a nonprofit based in Vancouver, Washington, the new UW Photonic Sensing Facility will use photons traveling through a fiber-optic cable to detect ground motions as small as 1 nanometer.
Seismologists used 30 detailed simulations of magnitude-9 slips on the Cascadia Subduction Zone to evaluate how the ShakeAlert earthquake early warning system would perform in these events. Results show the alerts generally work well, but suggest that lower alert thresholds provide more timely warnings over the full area that will feel the shaking.
Earthquake early warnings launched May 4 in Washington state. The Pacific Northwest Seismic Network helped develop the system, processes the data for the alerts, and operates hundreds of seismic stations across the state that detect the first signs of an earthquake.
The U.S. Geological Survey, the University of Washington-based Pacific Northwest Seismic Network, and state emergency managers on Tuesday, May 4, will activate the system that sends earthquake early warnings throughout Washington state. This completes the rollout of ShakeAlert, an automated system that gives people living in Washington, Oregon and California advance warning of incoming earthquakes.
In the Cascadia subduction zone, medium- and large-sized “intraslab” earthquakes, in which the slip happens within the oceanic plate and below the continental plate, will likely produce only a few detectable aftershocks, according to a new study from the University of Washington and the U.S. Geological Survey.
After years in development, an earthquake early warning system known as ShakeAlert is on the cusp of being released in Oregon and Washington. Harold Tobin, director of the Pacific Northwest Seismic Network, answers questions about the coming rollout.
Researchers at the University of Washington, Portland State University and the University of Oregon have shown that deep-seated landslides in the central Oregon Coast Range are triggered mostly by rainfall, not by large offshore earthquakes. The open-access paper was published Sept. 16 in Science Advances. “Geomorphologists have long understood the importance of rainfall in triggering landslides, and our study is simply driving home just how important it is,” said first author Sean LaHusen, who did the work as part of…
The U.S. Geological Survey announced $10.4 million in funding to the Pacific Northwest Seismic Network, based at University of Washington, to support the ShakeAlert earthquake early warning system. Some $7.3 million of the two-year funding total will go to the UW.
A series of seismic experiments will take place this summer in the Seattle area. The researchers are looking for volunteer sites throughout the region.
Harold Tobin, who joins the UW this fall as a faculty member in Earth and space sciences and director of the regional seismic sensing network, discusses earthquake early warning, seismic risks and the Pacific Northwest’s “big one.”
The largest number yet of detailed simulations for how a Cascadia Subduction Zone earthquake might play out provides a clearer picture of what the region can expect when the fault unleashes a 9.0 earthquake.
Paul Bodin, a UW seismologist and manager of the Pacific Northwest Seismic Network, has been named interim director of the network that monitors earthquakes and volcanoes in Washington and Oregon.
University of Washington oceanographers are working with a local company to develop a simple new technique that could track seafloor movement in earthquake-prone coastal areas.
The National Science Foundation is funding the largest marine seismic-monitoring effort yet along the Alaska Peninsula, a region with frequent and diverse earthquake and volcanic activity. Involving aircraft and ships, the new Alaska Amphibious Community Seismic Experiment will be led by Cornell University in Ithaca, New York, with partners at the University of Washington and seven other research institutions. “This effort will really change the information we have at our disposal for understanding the seismic properties of subduction zones,” said…
Events Monday celebrated the launch of a West Coast-wide earthquake early warning prototype system, and initial test users in Washington and Oregon.
An algorithm for stock prices can be used with GPS data to automatically detect slow-slip earthquakes at a single station, offering a new way to monitor seismic activity.
The cracking, bulging and shaking from the eruption of a mile-high volcano where two tectonic plates separate has been captured in more detail than ever before. A University of Washington study published this week shows how the volcano behaved during its spring 2015 eruption, revealing new clues about the behavior of volcanoes where two ocean plates are moving apart. “The new network allowed us to see in incredible detail where the faults are, and which were active during the eruption,”…
Research that peers below Mount St. Helens finds that the material below the western and eastern half of the mountain is different material and temperatures, and suggests that the source of explosive magma is coming from the east.
The UW is among West Coast universities awarded new funding to further develop ShakeAlert, an earthquake early warning system for the region.
UW seismologist John Vidale will participate in a White House summit focusing on national earthquake preparedness.
When an earthquake struck Nepal in late April 2015, thousands of lives were lost in the initial disaster. But it was hard to assess the scale of the damage to rural areas, and still lurking were threats from unstable slopes and dammed glacier-fed lakes that could dislodge at any time to flood villages below. A University of Washington Tacoma faculty member was part of an international team of scientists who worked with government agencies and private companies on a massive…
Recent press and social media coverage have reminded residents of the Pacific Northwest that they live in a seismically active region. Stretching offshore from northern California to British Columbia, the Cascadia subduction zone could slip at any time, causing a powerful earthquake and triggering a tsunami that would impact communities along the coast. Scientists from multiple disciplines at the University of Washington and other institutions are learning more about this hazard. Dozens of UW scientists are part of the M9…
A scale of simple numbers — the Richter Scale — unnerves us when we think about earthquakes, as Pacific Northwest residents have been prone to do lately. But who was Richter, and how did it all come about? Joe Janes takes a look for an installment of his Documents that Changed the World podcast series.
Teasing out how slow, silent earthquakes respond to tidal forces lets researchers calculate the friction inside the fault, which could help understand when and how the more hazardous earthquakes occur.
The first early earthquake warning system for the region has begun testing with a small group of users at businesses and public agencies in Washington, Oregon and British Columbia.
On the anniversary of a massive earthquake off our region’s coast, UW researchers are working on everything from tsunami evacuation structures to updated seismic hazard maps.
Scientists with the Pacific Northwest Seismic Network will install instruments this Thursday to provide real-time monitoring of the stadium’s movement during the 2015 NFL playoffs. It’s a valuable test of their newest seismic technology.
A new study used seabed samples collected by UW graduate students in the late 1960s to question current interpretations of earthquake frequency along the West Coast.
Dozens of geophysicists and volunteers will deploy 3,500 seismic sensors at Mount St. Helens next week in an unprecedented study of the volcano’s plumbing.
UW scientists installed a third seismograph at CenturyLink Field this week after the trial by fire of a website and new monitoring tools during last weekend’s Seahawks game.
Swarms of small earthquakes before a volcanic eruption can come in such rapid succession that they create a signal called harmonic tremor. A new eruption analysis from Alaska’s Redoubt Volcano shows the harmonic tremor glided to higher frequencies, then stopped abruptly just before six eruptions in 2009.
Oceanographers are using a growing number of seafloor seismometers, devices that record seafloor vibrations, to carry out inexpensive and non-invasive studies of endangered whales.
The Kamchatka Peninsula and Kuril Islands, long shrouded in secrecy by the Soviet government, are a seismic and volcanic hotbed with a potential to trigger tsunamis that pose a risk to the rest of the Pacific Basin.