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El Hierro / Canary Islands - Most Recent Information By The Most Diligent - And Recap Of Past Year
Ms Sans Serif
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[quote:Anonymous Coward 15368686:MV8xOTkxNzI2XzMzNTQ3OTYyXzEwNTMzRg==] [quote:Anonymous Coward 24242625:MV8xOTkxNzI2XzMzNTQ3MDczXzYxREQ2OTY3] [quote:American Trappers, LLC:MV8xOTkxNzI2XzMzNTQ2MTY0XzVGRENDMEQ3] [quote:Anonymous Coward 22580089:MV8xOTkxNzI2XzMzNTQzNDM1XzY0QjkzNkRE] wouldn't the different uplifts recorded on different parts of the island back the pore pressurisation theory? if this was that magma, 20 KM down doing this, surely the whole island would uplift by the same amounts roughly, but the facts some are uplifting more than others suggests to me pockets of pressurisations in the volcano? [/quote] I want to try and answer this for you. This is only my opinion. It's my theory and so far it has been proven true several times on Hierro, but there may be something else out there that I'm not aware of or considering. Anyway...let me explain it like this. Definitions of: Pressurisation 1. To maintain normal air pressure 2. [b]To put (gas or liquid) under a greater than normal pressure[/b] 3. [b]To resist pressure[/b] 4. To pressure-cook 5. [b]To subject to excessive stress or strain[/b] It would appear as though you're trying to separate the idea of magma from the idea of pressurisation when in fact it is one in the same; one causes the other. The magma is what is causing the pressure to occur. But it's not not JUST magma. As magma encounters natural gases, water, crude oil, etc., it will either consume that item or it will use it to produce exhaust or upon contact it produces an air gas such as steam from encountering water, etc. Not to mention, heat expands. So...as large groups of magma gets surged under the Island, the natural heat it brings with it will cause expansion as well. Now...I think maybe what will help you see the big picture is to understand there's not JUST a lake of magma at 20km or shallower under the island. There are huge pools of it no doubt, but there are also crevices, fractures in the rock, underground water ways, oil beds, natural gas pockets, fissures, and other types of cracks and seams in the earth beneath Hierro. So, as one of those fills up, the terrain above that immediate area expands. This is why we don't see the entire island rising all at once, and instead just see unique areas expanding. The ground adjacent and above the actual fissure or crack that is now filled with new incursions of magma will rise when the magma creates stress and pressure. Sometimes what we see when the elevation changes side to side is a large thin wall of magma has moved in somewhere and it is causing part of the island to move sideways. When the elevation drops it's normally because whatever the magma ate is now gone and the ground can settle OR the magma settles and/or moves to another area and the once expanded ground now settles back or even falls a little below zero. There will be no ground deformation without magma incursions, water escaping through fracking caused by human drilling, or via fault movements. There aren't any known fault lines moving through Hierro besides the miniature ones caused by the previous magma intrusions. So...this is pretty much left to magma to cause these deformations. [/quote] yes, pore pressurisation! exactly what is needed to make el julan slip! THAT'S what i'm saying! I know magma is causing it, but the fact is it is STILL very deep. I think it's heating the entire volcanic edifice above it, but, because el hierro is much like la palma, solid dykes of basalt and loose volcanic material in between, the bits in between are PRESSURISING, and that is the trigger! a magma chamber 20 km below the volcano SHOULD bulge up the entire area by a consistent amount in my opinion, but the fact some areas are rising more than others suggests to me trouble is brewing just me wild guessing, that's all. [/quote] Do you have a reference point to show that there IS a magma pool at 20km deep? In all the time we've been watching this (over a year), I've never seen any piece of evidence to show that there is in fact a pool of magma down there. I've only seen evidence pointing towards a spear coming up through the center of the island and then the crevices and cracks. If there IS a pool of magma down there it would really change the ideaology of those following the events. [/quote]
I am the former user "Idgits". About 100 consistent followers and contributors and I created the most informative thread on El Hierro and the Canary Islands archipelago that GLP has ever seen.
Thread: Best El Hierro Thread On GLP - Canary Islands - ACTIVITY HAS RETURNED - AGAIN!
I have since deleted the account that I was using to start that thread, thus the reason it says "AC" now as the original poster.
During the course of that thread I removed all of the "Hi's" and "How are you's" and "bump's" until about page 500...which condensed the thread down to around 280 pages. It has since continued to grow and has become a true source of facts surrounding the earthquake swarm and eventual eruption that took place last year, ending early this year.
Since that eruption officially ended, Hierro has shot back into action several times. I believe we are on the 4th major swarm of activity that has occurred since the eruptive phase ended. It has been recommended by one of our most consistent and well informed users "Shenue" as well as others, to start a new thread to showcase the newest events occuring in Hierro. The previous eruption was incredible, teaching science a whole new concept and understanding of underwater eruptions. It also produced the most radioactive lava ever recorded.
The most incredible feat of Hierro though, is how much pressure it is capable of maintaining WITHOUT erupting. In the last swarm we saw such an incredible increase in pressure that any other geologic formation would've theoretically blown sky high. But not Hierro...it's always maintained it's strength. The current combined energy under Hierro from both magma flow and seismic energy released is basically unknown as IGN stopped recording all the joules together...they stopped the eruptive phase recording in May of this year...here is that chart [
link to www.01.ign.es
So...this new thread is to pick up where Hierro has brought us now. I need to be able to change the thread title as events occur and be able to alert people with that title in case something serious occurs. In addition, there is SO MUCH information in that past thread that it's difficult for new users and followers to sift through to the most recent activities. Below I have comprised a list of information and links relative to the old thread. It's information that took us a year plus to gather!
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