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Geology thread
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| midtskogen | Date: Thursday, 04.09.2014, 09:31 | Message # 1 |
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| We don't have a thread for discussing geology related topics, I believe. The Earth is dynamic and interesting things have happened recently.
What will happen next in Iceland since new activity began three weeks ago still seems unclear. The earthquake activity is still strong with large quakes (~5M) every day. They even show up on my instruments 1500 km away. This map from the Icelandic Met Office is interesting (as of today, the map is updated):
It shows the location of all the earthquakes since the beginning. It shows how magma has moved along a rift northeast where it is now also erupting, and also that the biggest earthquakes have been around the Bárðarbunga volcano. Note the ring pattern, several km wide, showing that there is a lot of magma in the volcano (earthquakes do not happen in magma). If Bárðarbunga erupts, it could become an explosive one due to the large amount of water in the ice above it, which is several hundred metres thick.
I have a feeling that something more than the current fissure eruption will happen.
NIL DIFFICILE VOLENTI
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| DoctorOfSpace | Date: Thursday, 04.09.2014, 10:12 | Message # 2 |
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| I like this idea for a thread. I had some stuff a while back to share but never had a place to put it and have since lost the articles. I also moved this thread to Science and Astronomy section since it is a science thread.
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| midtskogen | Date: Thursday, 04.09.2014, 12:15 | Message # 3 |
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| Newly launched satellite depicts ground deformation after the SF Bay earthquake:
Radar vision maps Napa valley quake
Ground deformation can be mapped by comparing before and after measurements and on the day the satellite reached its orbit on 7th August it happened to image California, just a couple of weeks before the earthquake struck. A few days ago it could image California again, so the deformation could be mapped. A 6.0 earthquake hit the San Francisco bay area on 24th of August 03:21 local time just south of Napa Valley, the most largest in northern California in 25 years. It damaged property and cause injuries near the epicenter, but there were no deaths.
I was in downtown SF at the time and was awakened by the quake about 45 km from the epicentre. Fairly big movement, but gentle.
While this was the biggest quake in the area in 25 years, quakes of this magnitude occur frequently worldwide, usually a few every week.
NIL DIFFICILE VOLENTI
Edited by midtskogen - Thursday, 04.09.2014, 12:16 |
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| Watsisname | Date: Thursday, 04.09.2014, 12:26 | Message # 4 |
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| Surprised we didn't have one already given the general interests of our forum user base. Approve and will have stuff to share as well, but for now, warm bed calls.
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| midtskogen | Date: Friday, 05.09.2014, 06:25 | Message # 5 |
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| Some nice footage from the Icelandic eruptions:
Bárðarbunga is still producing many strong earthquakes. Below is the latest big one at 01:19UTC today as recorded by my seismometer in Oslo. IMO lists it as 3.1, EMSC says 5.0 and USGS says 5.2. I think USGS is closest for this one.
NIL DIFFICILE VOLENTI
Edited by midtskogen - Friday, 05.09.2014, 06:27 |
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| HarbingerDawn | Date: Friday, 05.09.2014, 09:02 | Message # 6 |
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| Quote midtskogen (  ) Some nice footage from the Icelandic eruptions:
Iceland: a lot hotter than the name implies.
Fantastic video!
All forum users, please read this!
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| Watsisname | Date: Friday, 05.09.2014, 11:51 | Message # 7 |
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| That's incredible. The lava seems very fluid; reminds me of Hawaiian rift eruptions. Neat seismometer recording, too. 
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| midtskogen | Date: Friday, 12.09.2014, 07:00 | Message # 8 |
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| I've seen lava flows twice. Once at Etna and once in Hawaii. Only close up within touching reach at Etna. The impressive part is not really the lava, but being close to an erupting volcano. It's like the whole mountain breathes, pants and moans. That's something I'd like to experience again.
EDIT: Iceland from space today:
There also is an ongoing eruption in Papua New Guinea. Here's an interesting video from the day it started:
Some are crazier than others, Marum crater, Vanuatu:
Added (12.09.2014, 06:00)
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Exfoliation:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Sunday, 07.09.2014, 19:31 |
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| spacer | Date: Saturday, 20.09.2014, 15:30 | Message # 9 |
 Star Engineer
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| i know this is Hebrew and i am sorry but huge stalactites cave Discovered near jerusalem
you can see the picture:
http://www.ynet.co.il/articles/0,7340,L-4573089,00.html
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
Edited by spacer - Saturday, 20.09.2014, 15:30 |
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| midtskogen | Date: Saturday, 25.04.2015, 08:54 | Message # 10 |
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| Japanese hikers trapped in ash cloud after sudden eruption of Ontake-san:
Added (25.04.2015, 08:54)
---------------------------------------------
Nepal earthquake as recorded by my seismometer:
Added: The sound of the earthquake (at ~1500x speed)
NIL DIFFICILE VOLENTI
Edited by midtskogen - Saturday, 25.04.2015, 10:45 |
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| Voekoevaka | Date: Saturday, 25.04.2015, 10:55 | Message # 11 |
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| Quote midtskogen ( )
Added: The sound of the earthquake (at ~1500x speed)
Why do we hear several shots at the beginning ? Are these the longitudinal then the transverse waves ?
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| midtskogen | Date: Saturday, 25.04.2015, 11:32 | Message # 12 |
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| We first hear the P-wave which has a higher pitch than the following S-wave. Both travel through the mantle. The P-wave is a compressional wave and travels roughly twice as fast as the perpendicular S-wave, which makes it possible to calculate the distance to the quake and the exact location if recordings from several stations are used. We then hear a loud rumble, which is the surface waves that travel along Earth's crust. In my recording these waves briefly go off scale, so there are some clipping sounds.
We also hear fainter "shots" in the rumble. These are aftershocks.
Much of what we know of Earth's interior comes from the study of seismographs. It's a pity that the many probes sent to Mars didn't bring geophones (yet). If we had had an operational seismic network on Mars, we would have known a lot more about the planet unless it's completely dead geologically (in which case we must hope for big meteor impacts).
NIL DIFFICILE VOLENTI
Edited by midtskogen - Saturday, 25.04.2015, 11:38 |
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| BlueDrache | Date: Saturday, 25.04.2015, 23:14 | Message # 13 |
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| The whole thing sounds like someone striking a metal ball with a hammer, before the rumble cuts in.
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| midtskogen | Date: Wednesday, 24.08.2016, 05:08 | Message # 14 |
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| M6.2 earthquake (+ M5.5 afterquake) in central Italy (2016-08-24) as recorded by my seismometer in Oslo:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Wednesday, 24.08.2016, 05:10 |
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| Salvo | Date: Wednesday, 24.08.2016, 10:01 | Message # 15 |
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| midtskogen, wow... Amazing how it can detect earthquakes from Nepal and Italy that are so far away 
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