Roughly 70% of the earth's surface covered by seas, it makes sense that 3/4 of volcanic eruptions are undersea ... if assuming equal distribution.
For a number of reasons, unequal distribution on land is not representative of undersea distribution. Chiefly because most of landmass is intercratonic.
Yet they say the effects of undersea eruptions, not mentioning the eruption itself, are rarely seen. So I wonder, just how do they resolve that 3/4 of eruptions are undersea?
Mariners know, mostly from the vast voids on charts, that the majority of seafloor still remains unmapped. Gov agencies know this to a higher degree. I wonder how much of the 3/4 is based on conjecture.
BTW: It was months before scientists could develop a high confidence that the 2012 pumice came from the area. Debate lingered about the source of the pumice ranging from the Southern Ocean (high latitude) to Japan.
I knew several private cruisers who had encountered the pumice. One had first encounter at night. There were notable telltales of significant change in sea state. They shut down to drift until daylight. They could not motor so slowly they sailed out of the thick slurry.
The other boat attempted to sail on, to traverse the pumice. Even though not knowing the extent of the field. Yes, foolish.
Boat vessels experienced severe abrasion to their hulls. This required haul outs for repairs. Metal hardware suffered pitting and scoring.
4 comments:
I don't know ....some people's thoughts have made big messes too.
Roughly 70% of the earth's surface covered by seas, it makes sense that 3/4 of volcanic eruptions are undersea ... if assuming equal distribution.
For a number of reasons, unequal distribution on land is not representative of undersea distribution. Chiefly because most of landmass is intercratonic.
Yet they say the effects of undersea eruptions, not mentioning the eruption itself, are rarely seen. So I wonder, just how do they resolve that 3/4 of eruptions are undersea?
Mariners know, mostly from the vast voids on charts, that the majority of seafloor still remains unmapped. Gov agencies know this to a higher degree. I wonder how much of the 3/4 is based on conjecture.
BTW: It was months before scientists could develop a high confidence that the 2012 pumice came from the area. Debate lingered about the source of the pumice ranging from the Southern Ocean (high latitude) to Japan.
I knew several private cruisers who had encountered the pumice. One had first encounter at night. There were notable telltales of significant change in sea state. They shut down to drift until daylight. They could not motor so slowly they sailed out of the thick slurry.
The other boat attempted to sail on, to traverse the pumice. Even though not knowing the extent of the field. Yes, foolish.
Boat vessels experienced severe abrasion to their hulls. This required haul outs for repairs. Metal hardware suffered pitting and scoring.
No commentary on your host's thoughts, please
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