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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:MV8xOTkxNzI2XzMzNDk5Mzc3X0I3RTU3MzAw] [quote:Gizzie 8598858:MV8xOTkxNzI2XzMzNDk5MTE3X0UyM0IwMEU4] Hi AT, I think you may want to take a look at this...A new post has just been posted on Volcano Cafe...Interesting to say the least.. [u][b]El Hierro : a tectonic compression/relaxation mechanism?[/b][/u] [b]Hypothesis: the earthquake swarms report relaxation of accumulated, compressive tectonic stresses[/b] Read the full posting here: http://volcanocafe.wordpress.com/2012/09/19/el-hierro-a-tectonic-compressionrelaxation-mechanism/#comments Would of posted snippets but it is way to much information to post on here. Hopefully someone can dig the Juicy bits out though and post them.... [/quote] Thanks...here's what catches me: "The crust under the Canaries, part of the African tectonic plate, is moving north eastwards at 24mm annually in response to drag from the upper mantle." That would explain some of the quakes however, we've seen 24mm of movement in ONE DAY during these swarms!!!! "This compressive stress accumulation must be almost silent to seismometers: very few earthquakes have been recorded at Hierro over 25 years prior to 2011." So...Hierro has begun a phase...something that has not occured in the thousands of years it has been there and it is not stopping. I think this one sentence right here verifies that Hierro is on the road to something substancial and frankly...unpredictable. "It is the sudden relaxation of accumulated compressive stress that causes the earthquakes. The earthquake swarms are proposed to result from relaxation of compressive stress." I don't agree with this concept. Show me how the progressive stress is reduced in some measurable capacity and then maybe I'll buy it. The plate doesn't just stop compressing...unless it's overall movement is finally over. Which...the rest of the article does not specify. What I could buy is that the bulk plate and the surface plate might be finding a way to relax from their movement from each other. What's really interesting is to consider that this archipelago's bulk plate seems to be filtering ativity ONLY towards Hierro and the stress relaxation is offset by sudden deep, sometimes very deep, quakes around the Tenerife/Grand Canary island. We also saw one at 79km deep north east of La Palma a few days ago. That to say the least was interesting...that quake would've been BELOW the mantle...in the core! Their imagery on #8, and without their actual explanation, may explain why the Frontera Bay region has seen most of the landslides. All the pressure is pushing forwards on the island. However, that also means that at some point the underside of the south can buckle and do a barber chair. It can become so unstable at the water line that it breaks and rolls outwards, causing a reverse slide. THanks for the link and the info. THat was a great read! :) [/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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