An interesting conundrum.

>>Observations of seismic activity around the Mariana Trench have revealed that subducting tectonic plates are dragging more water deeper into the Earth, which could change our understanding of the global water cycle.<<

>>The observations suggest that in the Mariana Trench, four times more water is captured and dragged down than previous studies estimate. If this trend applies to other similar regions around the world, then there could be about three times more water in the deep mantle than we thought. That lines up well with the recent discovery of exotic forms of ice trapped in diamonds, which are also evidence of a wetter mantle.<<

https://newatlas.com/mariana-trench-water-mantle/57239/

PermeateFree said:

An interesting conundrum.

>>Observations of seismic activity around the Mariana Trench have revealed that subducting tectonic plates are dragging more water deeper into the Earth, which could change our understanding of the global water cycle.<<

>>The observations suggest that in the Mariana Trench, four times more water is captured and dragged down than previous studies estimate. If this trend applies to other similar regions around the world, then there could be about three times more water in the deep mantle than we thought. That lines up well with the recent discovery of exotic forms of ice trapped in diamonds, which are also evidence of a wetter mantle.<<

https://newatlas.com/mariana-trench-water-mantle/57239/

But it can only do it on even numbered days.

PermeateFree said:

An interesting conundrum.

>>Observations of seismic activity around the Mariana Trench have revealed that subducting tectonic plates are dragging more water deeper into the Earth, which could change our understanding of the global water cycle.<<

>>The observations suggest that in the Mariana Trench, four times more water is captured and dragged down than previous studies estimate. If this trend applies to other similar regions around the world, then there could be about three times more water in the deep mantle than we thought. That lines up well with the recent discovery of exotic forms of ice trapped in diamonds, which are also evidence of a wetter mantle.<<

https://newatlas.com/mariana-trench-water-mantle/57239/

> It’s commonly believed that most of it is ejected back to the surface through volcanic eruptions, sometimes hundreds of miles away.

Yes. Conservation of mass usually makes sense.

But I worry that we are currently going through a phase of a less than average volume of volcanic eruptions. If so, then that would explain why water subducted could currently exceed water erupted.

PermeateFree said:

An interesting conundrum.

>>Observations of seismic activity around the Mariana Trench have revealed that subducting tectonic plates are dragging more water deeper into the Earth, which could change our understanding of the global water cycle.<<

>>The observations suggest that in the Mariana Trench, four times more water is captured and dragged down than previous studies estimate. If this trend applies to other similar regions around the world, then there could be about three times more water in the deep mantle than we thought. That lines up well with the recent discovery of exotic forms of ice trapped in diamonds, which are also evidence of a wetter mantle.<<

https://newatlas.com/mariana-trench-water-mantle/57239/

> These images show that the low mantle velocities that result from mantle hydration extend roughly 24 kilometres beneath the Moho discontinuity. Combined with estimates of subducting crustal water, these results indicate that at least 4.3 times more water subducts than previously calculated for this region.

The mantle for this distance under the crust is notoriously variable. The results for one region can be and often is, very different to other regions.