Water Worlds & Oceanography

Pythia’s Oasis Has Warm liquid Spewing From The Seafloor Offering Clues To Earthquake Hazards

By Keith Cowing
Press Release
University of Washington
April 11, 2023
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Pythia’s Oasis Has Warm liquid Spewing From The Seafloor Offering Clues To Earthquake Hazards
Sonar image of bubble plumes at Pythia’s Oasis. This is a perspective view looking northeast at the bubble plumes rising above Pythia’s Oasis, imaged during a 2018 transect onboard the R/V Revelle using a Kongsberg EM122 multibeam sonar. The hydroacoustic data were filtered using Fledermaus Midwater and reveal gas bubbles rising >500 m into the overlying ocean (image is 2× vertically exaggerated). The bathymetry shown here was collected onboard the R/V Thompson in 2015 and has been gridded at 20-m horizontal resolution.

Editor’s note: Pythia’s Oasis is a newly-discovered seafloor seep off the coast of Oregon featuring water with a unique composition from an exceptionally deep location inside Earth. A varied ecosystem exists where this water rises out of the sea floor. When we explore ocean world such as Europa, Ganymede, Enceladus and ocean worlds in other star systems, how materials from within a world and their ocean interact can have importan impacts on habitability and the presence of life.

The field of plate tectonics is not that old, and scientists continue to learn the details of earthquake-producing geologic faults. The Cascadia Subduction Zone — the eerily quiet offshore fault that threatens to unleash a magnitude-9 earthquake in the Pacific Northwest — still holds many mysteries.

A study led by the University of Washington discovered seeps of warm, chemically distinct liquid shooting up from the seafloor about 50 miles off Newport, Oregon. The paper, published Jan. 25 in Science Advances, describes the unique underwater spring the researchers named 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 fault.

Map of Pythia’s Oasis and surrounding features. Pythia’s Oasis is located on the midcontinental slope ~80 km west of Newport, Oregon (see inset at top right). The seep site is located 10 km southeast of the well-studied Southern Hydrate Ridge, which was the subject of drilling during Ocean Drilling Program (ODP) Leg 204 (drill holes are shown as black diamonds); also shown is the location of ODP Hole 892 on Northern Hydrate Ridge, cored during ODP Leg 146. The multibeam-derived seep locations at Pythia’s Oasis are displayed as orange dots (see inset at bottom left), and the multibeam survey trackline is displayed in purple (labeled MB 2018). Also displayed are the 2015 locations of ROV-derived seafloor observations (green triangles; orifice and blowout) and the multichannel seismic (MCS) lines (dashed gray lines), and the locations of multibeam-derived seep locations during a survey along the Alvin Canyon Fault (ACF) in 2019 during expedition AT 42-17 onboard the R/V Atlantis (blue circles). The inferred location of the ACF (fig. S9) is supported by the lineament present in the bathymetry to the east of Pythia’s Oasis (gray arrow). The bathymetry shown is that of GMRT Version 3.7 (October 2019) (82), with contours drawn at 10-m (minor) and 100-m (major) depth intervals.

“They explored in that direction and what they saw was not just methane bubbles, but water coming out of the seafloor like a firehose. That’s something that I’ve never seen, and to my knowledge has not been observed before,” said co-author Evan Solomon, a UW associate professor of oceanography who studies seafloor geology.

The team made the discovery during a weather-related delay for a cruise aboard the RV Thomas G. Thompson. The ship’s sonar showed unexpected plumes of bubbles about three-quarters of a mile beneath the ocean’s surface. Further exploration using an underwater robot revealed the bubbles were just a minor component of warm, chemically distinct fluid gushing from the seafloor sediment.

The feature was discovered by first author Brendan Philip, who did the work as a UW graduate student and now works as a White House policy advisor.

Observations from later cruises show the fluid leaving the seafloor is 9 degrees Celsius (16 degrees Fahrenheit) warmer than the surrounding seawater. Calculations suggest the fluid is coming straight from the Cascadia megathrust, where temperatures are an estimated 150 to 250 degrees Celsius (300 to 500 degrees Fahrenheit).

The warm, water-dominated vent at Pythia’s Oasis. The high-volume, 12°C flow at Pythia’s Oasis is confined to a 5-cm-diameter vent located ~380 m away from the collapse zone. These images were taken during ROPOS dive R1858 on 24 July 2015. The focused discharge of fluids from this vent has been observed during multiple ROV dives in 2015 and 2016.

The new seeps aren’t related to geologic activity at the nearby seafloor observatory that the cruise was heading toward, Solomon said. Instead, they occur near vertical faults that crosshatch the massive Cascadia Subduction Zone. These strike-slip faults, where sections of ocean crust and sediment slide past each other, exist because the ocean plate hits the continental plate at an angle, placing stress on the overlying continental plate.

Loss of fluid from the offshore megathrust interface through these strike-slip faults is important because it lowers the fluid pressure between the sediment particles and hence increases the friction between the oceanic and continental plates.

“The megathrust fault zone is like an air hockey table,” Solomon said. “If the fluid pressure is high, it’s like the air is turned on, meaning there’s less friction and the two plates can slip. If the fluid pressure is lower, the two plates will lock – that’s when stress can build up.”

Fluid released from the fault zone is like leaking lubricant, Solomon said. That’s bad news for earthquake hazards: Less lubricant means stress can build to create a damaging quake.

This is the first known site of its kind, Solomon said. Similar fluid seep sites may exist nearby, he added, though they are hard to detect from the ocean’s surface. A significant fluid leak off central Oregon could explain why the northern portion of the Cascadia Subduction Zone, off the coast of Washington, is believed to be more strongly locked, or coupled, than the southern section off the coast of Oregon.

“Pythias Oasis provides a rare window into processes acting deep in the seafloor, and its chemistry suggests this fluid comes from near the plate boundary,” said co-author Deborah Kelley, a UW professor of oceanography. “This suggests that the nearby faults regulate fluid pressure and megathrust slip behavior along the central Cascadia Subduction Zone.”

Solomon just returned from an expedition to monitor sub-seafloor fluids off the northeast coast of New Zealand. The Hikurangi Subduction Zone is similar to the Cascadia Subduction Zone but generates more frequent, smaller earthquakes that make it easier to study. But it has a different sub-seafloor structure meaning it’s unlikely to have fluid seeps like those discovered in the new study, Solomon said.

The research off Oregon was funded by the National Science Foundation. Other co-authors are Theresa Whorley, who did the work as a UW doctoral student and now works as an environmental consultant in Seattle; Emily Roland, a former UW faculty member now at Western Washington University; Masako Tominaga at Woods Hole Oceanographic Institution; and Anne Tréhu and Robert Collier at Oregon State University.
For more information, contact Solomon at esolomn@uw.edu or Kelley at dskelley@uw.edu.

Fluid sources and overpressures within the central Cascadia Subduction Zone revealed by a warm, high-flux seafloor seep, Science (open access)


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