Back in the ol' Wordpress days, I did try to have a Mailbag column here on Eruptions. I'd like to restart that here on ScienceBlogs, so if you have any volcano-related questions (or heck, any questions), please email them to me at ewklemett (at symbol) gmail (dot) com. After I get enough questions, I'll answer them in a weekly (biweekly? monthly?) column.
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I already dig this blog... I thought about the mailbag thing, but, well, you'll see. maybe you'll have fewer nightmares.
Why would old shipwrecks appear to resurface when a volcano seems to be impending a eruption? Is the water retreating? Or is there gases from the volcano that are being emitted that might cause the displacement of the water and therefore the ships remerge?
Ok. You're at a movie with friends. In the movie some paleontologists are digging away. One of them digs up an Ammonite. Then a volcano starts erupting, practically underneath them. Turns out these people are somewhere on Iceland.
What do you do?
Hunter,
I know there isn't a hard and fast rule about ships resurfacing before a volcanic eruption.
However, I'll go out a bit of a limb and suppose that you watched a tv show on Yellowstone within the past few weeks. At Yellowstone lake a previously submerged boat is now partially above water. Over many years there has been some inflation of the lake - And also some tilting of it.
Yellowstone lake has also experienced hydrothermal eruptions of a massive scale in the past.Wet areas under the lake may get heated up and build up pressure and cause a steam explosion that can be very dangerous for anyone near or on the lake. Think of a hydrothermal explosion as old Faithful - but maybe up to ten thousand times larger.
Islands that are rising due to magma intrusion can grow from magma intrusions below and may push the Island higher out of the water and bring sunken ships to the surface.
Captain Cook landed on Iwo Jima hundreds of years ago and it has risen 40 meters since then. Iwo Jima is based in a submerged caldera. So, if there was any vessel sunk around Iwo Jima it could have been raised out of the water as the Island rose over the hundreds of years since Captain Cook set foot on it.
Thanks Thomas Donlon. Your answer makes lots of sense.
Very intresting post, thanks you admin for this wonderful information