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Message Subject
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El Hierro / Canary Islands - Most Recent Information By The Most Diligent - And Recap Of Past Year
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Poster Handle
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Gizzie |
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Post Content
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Good Morning.. 2012-09-19 10:16- 23 earthquakes in total yesterday, the last one being a M1.7 at 14 km - 7 earthquakes so far this morning, 2 at a depth of 10 km (El Golfo and Las Calmas), the rest at approx. 20 km deep in the old crater area and El Pinar area - GPS deformations : Frontera : a few mm further inflated, a couple of mm to the North-East Pinar : stabilised in horizontal and vertical axis (normal as with the decrease in number and strength of the earthquakes, the pressure below the center of the island has strongly subsided) Restinga : comes as a surprise – Restinga is pushed a few mm to the east and has a further strong inflation of nearly 1.5 cm Ultra Rapid preliminary results) [ link to earthquake-report.com] The last part of your post caught me eye. 1.5 cm in restinga. That's huge when you figure the ground itself has moved that far. AND...there haven't been any significantly large quales going on. Strange how it could move that far or inflate that much without strong magmatic intrusion or quakes.not really op.. could it be caused by pore pressurisation?
''Thermally induced pore pressures appear capable of
developing large uplift forces beneath a potentially un-
stable block''
from that link above.
Quoting: Anonymous Coward 24018209 good point. However...wouldn't that lead to cracking? When the ground pops and cracks from thermal pressure it is an earth quake and registers as such. Shouldn't we be seeing quakes listed from that? Or...is the ground really that flexible? I think your right AT.... What we got to remember as well is, the quakes are quite deep...I don't think it is pressure causing the uplift...probably more likely the 4th injection of magma under the island that is causing the uplift..dont forgot also, after the 3rd injection not long ago, there was no eruption, so we have a 4th lot of magma coming up under the 3rd, this causing the uplift.... Don't get me wrong, there is pressure building up, but it remains to be seen if the 4th injection will actually cause a new eruption...probably depends on the amount of magma coming up and also the speed of it... Either way, El Hierro continues to through conundrums our way.. even the scientists studying it are still at a lost as to what is really going on below that Island..
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