Next week’s big question: Logan, a 4th grader from Arbor Vitae, Wisconsin has a question about water snakes.
But by averaging seismic signals over a long period — six months, for example — a consistent signal emerges.
This week, Paul from Madison wondered about waves. In a study published today in the Journal of Geophysical Research Solid Earth, scientists at the University of Utah report that these small seismic signals can aid science. If the winds are light, you get little ripples. Thus, rather than relying on satellite or eyewitness observations, lake freezing and thawing could be monitored by an autonomous seismometer. Rogue waves are an open water phenomenon, in which winds, currents, non-linear phenomena such as solitons, and other circumstances cause a wave to briefly form that is far larger than the "average" large occurring wave (the significant wave height or "SWH") of that time and place. Water We Talking About? While limnology is the study of inland waters, our expertise doesn’t technically extend to the physics of waves, so we couldn’t find an in-house scientist to tackle this one. “So far it is.” Seismological observations may not be needed at Yellowstone Lake, but could be useful for monitoring more remote lakes for long-term changes to ice cover duration. A “big” wave on Lake Mendota might be 3 feet high, but, during a storm on Oct. 24, 2017, a buoy in Lake Superior recorded 29-foot high waves north of Marquette, Michigan! Mokhdhari looked at microseismic data from Yellowstone Lake, a well-observed lake for which the freezing and thawing dates are known. So, not surprisingly, it can produce some truly epic waves. Their colleagues are looking to understand the hydrothermal vents in Yellowstone Lake, but Mokhdhari and Koper are much more interested in capturing microseisms from all angles. First, there’s a thing called “fetch.” No, it has nothing to do with the family dog, it’s a word that, basically, means how much open water there is for wind to blow across. Researchers can create these seismic sources with methods like a hammer on a metal plate, an explosion, or a specially outfitted truck with a vibrating plate.
A single meteotsunami can travel long distances and influence a very large range of the coastline. “We don’t really know how it’s created.”. What causes big waves on a lake? IF sky-high temperatures have you sweltering this week, you may be tempted to take a dip in the great outdoors to cool off. Additionally, they will use a buoy on the lake to measure wind and wave conditions. Well, no. On a much grander scale, the same phenomenon occurs in large bodies of water such as bays and lakes. But, back to the waves. In a similar fashion, earthquakes, tsunamis, or severe storm fronts may also cause seiches along ocean shelves and ocean harbors. “We compare the data we got from the seismograph to see if it’s the same,” she says. And as a small, constant source of seismic energy in the surrounding earth, lake microseisms can shine a light on the geology surrounding a lake. “We’ve recently found that the waves on lakes actually generate these microseisms too,” Koper says. Last updated: 06/25/18 Seiches are usually limited to partially or fully enclosed basins, such as Lake Erie. Lakes, Koper says, provide a natural, regular source. Seismic waves travel through different geological materials at different speeds, so observing how waves change as they emanate from a source can reveal subsurface geology.
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