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WWLLN and Superbolts in the NewYorkTimes
Wednesday, September 18, 2019
Science story about our (WWLLN) recent JGR paper regarding superbolts, which are lightning strokes which are more than 3 orders higher in energy than the mean. Read More
New insights into the geodynamics of the India-Asia collision
Friday, September 13, 2019
The collision between India and Asia, one of the most dramatic tectonic events of the last 100 million years, could have had a more complex history than we thought. Learn more about this from the work of the research team led by ESS Assistant Professor Alexis Licht in Myanmar, featured this week in an article in Nature Geoscience. Read More
Lightning 'superbolts' form over oceans from November to February
Tuesday, September 10, 2019
The lightning season in the Southeastern U.S. is almost finished for this year, but the peak season for the most powerful strokes of lightning won’t begin until November, according to a newly published global survey of these rare events.
A University of Washington study maps the location and timing of “superbolts” -- bolts that release electrical energy of more than 1 million Joules, or a thousand times more energy than the average lightning bolt, in the very low frequency range in which lightning is most active. Results show that superbolts tend to hit the Earth in a fundamentally different pattern from regular lightning, for reasons that are not yet fully understood.
The study was published Sept. 9 in the Journal of Geophysical Research: Atmospheres, a journal of the American Geophysical Union.
“It’s very unexpected and unusual where and when the very big strokes occur,” said lead author Robert Holzworth, a UW professor of Earth and space sciences who has been tracking lightning for almost two decades.
Holzworth manages the World Wide Lightning Location Network, a UW-managed research consortium that operates about 100 lightning detection stations around the world, from Antarctica to northern Finland. By seeing precisely when lightning reaches three or more different stations, the network can compare the readings to determine a lightning bolt’s size and location.
The network has operated since the early 2000s. For the new study, the researchers looked at 2 billion lightning strokes recorded between 2010 and 2018. Some 8,000 events -- one in 250,000 strokes, or less than a thousandth of a percent -- were confirmed superbolts.
“Until the last couple of years, we didn’t have enough data to do this kind of study,” Holzworth said.
The authors compared their network’s data against lightning observations from the Maryland-based company Earth Networks and from the New Zealand MetService.
The new paper shows that superbolts are most common in the Mediterranean Sea, the northeast Atlantic and over the Andes, with lesser hotspots east of Japan, in the tropical oceans and off the tip of South Africa. Unlike regular lightning, the superbolts tend to strike over water.
“Ninety percent of lightning strikes occur over land,” Holzworth said. “But superbolts happen mostly over the water going right up to the coast. In fact, in the northeast Atlantic Ocean you can see Spain and England’s coasts nicely outlined in the maps of superbolt distribution.”
“The average stroke energy over water is greater than the average stroke energy over land -- we knew that,” Holzworth said. “But that’s for the typical energy levels. We were not expecting this dramatic difference.”
The time of year for superbolts also doesn’t follow the rules for typical lightning. Regular lightning hits in the summertime -- the three major so-called “lightning chimneys” for regular bolts coincide with summer thunderstorms over the Americas, sub-Saharan Africa and Southeast Asia. But superbolts, which are more common in the Northern Hemisphere, strike both hemispheres between the months of November and February.
The reason for the pattern is still mysterious. Some years have many more superbolts than others: late 2013 was an all-time high, and late 2014 was the next highest, with other years having far fewer events.
“We think it could be related to sunspots or cosmic rays, but we’re leaving that as stimulation for future research,” Holzworth said. “For now, we are showing that this previously unknown pattern exists.”
Co-authors are research associate professor Michael McCarthy and senior research scientist Abram Jacobson at the UW; and James Brundell and Craig Rodger at the University of Otago in New Zealand. The research was funded by the UW.
For more information, contact Holzworth at email@example.com or 206-685-7410.Read More
UW scientists track newly-discovered lightning 'superbolts' | KOMO
Tuesday, September 10, 2019
University of Washington researchers have been studying a relatively newly discovered phenomenon where thunderstorms can occasionally put out a super-charged bolt that releases about 1,000 times more energy than a typical lightning strike. Robert Holzworth, a UW professor of Earth and space sciences, is quoted. Read More
Last day of the dinosaurs' reign captured in stunning detail | National Geographic
Tuesday, September 10, 2019
Rocks from deep inside the Chicxulub impact crater show what happened in the minutes to hours after one of our planet's most catastrophic events. Jody Bourgeois, professor emeritus of Earth and space sciences at the UW, is quoted. Read More
Solving the mystery of the Moses Coulee canyon to be discussed in Kennewick | Tri City Herald
Tuesday, September 3, 2019
The mystery of Washington state's Moses Coulee canyon will be discussed at a free lecture Sept. 10 in Kennewick. Joel Gombiner, a graduate student in Earth and space sciences at the UW, is quoted. Read More
Over 4,100 earthquakes strike west of Puget Sound, but you can't feel them | seattlepi.com
Wednesday, August 28, 2019
An episodic tremor and slip event appears to be underway, according to scientists at the UW-based Pacific Northwest Seismic Network. Steve Malone and Mouse Reusch, both with PNSN, are quoted. Read More
Small tremors light up Pacific Northwest | KOMO
Friday, August 23, 2019
The Pacific Northwest Seismic Network has recorded over 4,000 tremors along the West Coast since Aug. 11. Stephen Malone, a research professor emeritus of Earth and space sciences at the UW, is quoted. Read More
Seismologists: Seismic event underway that could increase risk of large earthquake in region | KIRO 7
Thursday, August 22, 2019
A major seismic event is underway, and scientists at the UW's Pacific Northwest Seismic Network are saying the Puget Sound could be at a higher risk for earthquakes. Harold Tobin, director of PNSN and a UW professor of Earth and space sciences, is interviewed. Stephen Malone, a research professor emeritus of Earth and space sciences at the UW, is quoted. Read More
Earthquake warning system gets funding boost | US News
Tuesday, August 20, 2019
THE U.S. Geological Survey is greatly increasing funding for the region's seismic network, putting it on track to send public alerts of impending earthquake shaking within the next two years. Harold Tobin, director of the UW-based Pacific Northwest Seismic Network and professor of Earth and space sciences at the UW, is quoted. [This AP story appeared in several outlets] Read More