Geobulletin alpha

News from the Geoblogosphere feed

by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Posts treating: "principle"

Sunday, 30 August 2015

sort by: date | clicks

Location location location 

James’ Empty Blog [2015-08-30 10:21:00]  recommend  recommend this post  (730 visits) info

 GB
img
Barely two week after we put a sign on the gate, we have sold Sea Neuk. At least, the sale is agreed in principle and it's in the hands of the lawyers. The Scottish system (which I've never been involved in before) doesn't seem quite as different from the English one as it is sometimes said, and there is no legally binding contract at this point so I'm not going to say too much about

The Sykesville Formation, in 6 new GigaPans 

Mountain Beltway [2015-08-03 14:34:11]  recommend  recommend this post  (136 visits) info

 Ordovician,Cambrian; US,FR
As part of my work on the GEODE project, I’m always looking for good imagery to teach key concepts in geoscience. One important concept that I’ve been thinking about lately is the principle of relative dating on the basis of inclusions. Just as you can’t bake a loaf of raisin bread without already having raisins in your kitchen, rock units that are included in another rock unit must be older

Modelling the state of 'balance' of the Earth's outer layers - isostasy 

Earth Learning Idea [2015-03-16 12:30:00]  recommend  recommend this post  (91 visits) info
img
Today's new ELI is 'Isostasy 1; modelling the state of 'balance' of the Earth's outer layers'. Isostasy is essentially the principle of hydrostatic equilibrium applied to the Earth, otherwise called ‘buoyancy’. You can model this principle using wooden blocks floating in water and in a denser medium. Lots of activities about the structure of the Earth can be found on our

Drunk on Geology - Mönchhop Mosel Slate Riesling 

The Geology P.A.G.E. [2015-03-05 17:35:00]  recommend  recommend this post  (629 visits) info

 Devonian; DE,US
img
The next up on the Drunk on Geology series is the Mosel Slat Riesling wine from the Mönchhof winery from the Mosel region of Germany.The Mosel Slates are comprised of two main slate deposits, Ürziger Würzgarten and Erdener Treppchen. The Ürziger Würzgarten (pictured below) means "The Spice Gardens of Ürzig". These rocks are a very iron-rich Devonian slate mixed with volcanic rocks in the soil. Oxidation of the iron gives the rocks their characteristic [...]

Fieldwork: Applying 'the present is the key to the past' 

Earth Learning Idea [2014-07-07 19:00:00]  recommend  recommend this post  (71 visits) info
img
The new ELI today is 'Fieldwork: Applying 'the present is the key to the past'. This five-phase outdoor activity is used to explain how Earth scientists use the Principle of Uniformitarianism, often simply stated as ‘the present is the key to the past’, by considering the present environment and thinking how it might be preserved geologically. It is one of many outdoor ELIs - all listed on

A great visualization of InSAR data by the ESA – ups and downs at the East African Rift 

Digital Geography [2013-08-07 22:39:14]  recommend  recommend this post  (592 visits) info
InSAR (Interferometric Synthetic Aperture Radar) is one of the greatest remote sensing tools for everyone interested in crustal movements. The principle is simple: A satellite equipped with a radar device is constantly measuring the topography of the Earth while orbiting. When it crosses the same area a second time, the two datasets can be compared

Which is older? 

Mountain Beltway [2013-07-01 14:44:11]  recommend  recommend this post  (56 visits) info
Using your relative dating prowess to determine which of these two rock units is older, the schist (dark gray) or the granite (light pink): Click to enlarge Click to enlarge Justify your answer by citing a principle of relative

Structure: Mohr Circles 

Life in Plane Light [2011-03-08 05:17:38]  recommend  recommend this post  (129 visits) info
We’re taking a short break from optical mineralogy this week–a bit ironic considering the fact that optical is a large discussion topic at the moment–and going to talk instead about a structural geology tool: Mohr circles. What are Mohr circles supposed to bring to the table: the relationship between the principle stresses acting on a

Mineralogical Society of America proposes a position statement on Asbestos 

Lounge of the Lab Lemming [2011-02-28 22:57:00]  recommend  recommend this post  (37 visits) info
The Mineralogical Society of America has proposed a position statement on Asbestos. The criteria of position statements, as explained on their website are:A position statement should express or espouse a principle or policy of timely significance to the MSA community. The position statement should be consistent with the purpose of MSA and supportive of the disciplines represented by

Geology Links for February 22nd, 2011 

Geology News [2011-02-23 02:00:04]  recommend  recommend this post  (211 visits) info
Links from del.icio.us, tagged with geology on February 22nd, 2011: Welcome to Understanding Geologic Time Rock Around the Park: Webrangers Activity GeoPet Brasil Mid-Continental Earthquakes May Migrate from Fault to Fault Burke Museum – Rocks and Minerals Interactive Earthquakes for Kids The principle of earthquakes – Natural Science – Science – Paper CraftCanon CREATIVE PARK

Electrical resistance 

Earth Learning Idea [2011-01-03 15:27:00]  recommend  recommend this post  (27 visits) info
img
Try our latest Earth Learning Idea - ´Electrical ground probing´. In this activity pupils learn how to measure the electrical resistance of the ground to find buried objects. They are probably aware of the principle of using geophysical methods to locate objects and structures buried below ground; the methods are often called ´geophys´ on television programmes. This is a clever

Geophysicists using fiber optic cables in homeland security applications 

GeoPrac.net [2010-12-19 22:23:27]  recommend  recommend this post  (7 visits) info
Researchers from Zonge Engineering in my own Tucson, Arizona along with researchers at the University of Arizona's Mining and Geological Engineering Department (my alma mater) have completed a report on a fiber optic monitoring system that has wide-ranging applications in border security, prison perimeter protection, mine safety and other applications. The Helios system uses the principle of 'optical backscattering' to detect small acoustical vibrations, such as an illegal border crosser, or a [...]

Earthquake Building Code Principles Becoming Irrelevant 

Ontario-geofish [2010-12-13 19:30:00]  recommend  recommend this post  (33 visits) info
Article I've always been in conflict with our sappy building codes.  Basically, they've operated on a 'No Pancake' principle since the beginning of time.  Even so, the old boys club constantly fights upgrades to these codes, citing that the past is good enough. But in the East, we aren't going to have pancaking, so it makes the codes useless.  We are going to have devastating economic

A Quiz on Earth History: Can You Pass? A Comment on Science Education 

Geotripper [2010-10-25 07:51:00]  recommend  recommend this post  (76 visits) info
img
Which is older, the dark dike, or the lighter sedimentary rocks?How would you do on this test (taken from a chapter in Carlson, Plummer and Hammersly's excellent Physical Geology: Earth Revealed textbook)?1. “ Geological processes operating at present are the same processes that have operated in the past” is the principle of a. correlation b. catastrophism c. uniformitarianism d. none of

Nuclear Waste Underground Disposal - Primer - 2 

Ontario-geofish [2010-09-27 15:41:00]  recommend  recommend this post  (38 visits) info
The second term to define is 'Disposal'.  In normal terms of human waste, this means stashing it somewhere, until it can turn into a nice compost, and feed a forest.  It might have heavy metals, bacteria and such, but the trees can take care of it.  For radioactive materials, it is the same principle -- stash it away until the next exposure to humans isn't any worse than the million other

IPCC Assessment Report 5 authors 

James’ Empty Blog [2010-06-24 00:46:00]  recommend  recommend this post  (12 visits) info
Can be found here.Not too many surprises from what I can see, apart from the author of the previous version who insisted shortly afterwards that it was such a nightmare that he wouldn't consider doing it again...and is now a coordinating lead (OK, I'm not really surprised by this).On principle I'd always like to see more fresh faces and fewer of the same old same old, but I haven't

April Fool 

James’ Empty Blog [2010-04-01 23:18:00]  recommend  recommend this post  (6 visits) info
Several people have pointed me to this article by John McLean. I don't really object in principle to ABC giving him the space to reply to Stephan Lewandowsky's previous article on peer review and the McLean paper. It's a commentary site, not held to the same standards as peer review journals.And it shows.There's plenty of fluff but the central lie remains: McLean claims that they data were

Cold War in the 21st century 

Cryology and Co. [2010-03-10 20:50:00]  recommend  recommend this post  (14 visits) info
img
The principle behind the system of the "Cold War" is simple: you have to possess a weapon stronger then your adversary.So it's no wonder when governments all over the world are secretly constructing weapons with alien technology - or at least that is what the conspiracy fanatics all over the net are claiming.Two recent examples: The EU will get the "Black Weapon Gun", unfortunately for the

RV Polarstern Expedition: Sediment Cores 

IPY Blogs [2010-01-11 15:41:27]  recommend  recommend this post  (816 visits) info
A very important aspect of marine research is the coring of sediments. There are many ways in which sediments can be brought on board on a research vessel - through the help of a Gravity corer, a Piston corer or a Box corer. All three work with different principles of weight and pressure and provide the scientists with different amounts of sediments to work on. To proffer an example from this research cruise, the Gravity corer was used when we had bad weather and heavy waves, as it falls [...]

Who Owns This Stony Meteorite? 

Geology.com News [2009-11-29 06:53:35]  recommend  recommend this post  (18 visits) info
A guy finds a meteorite in Australia, gets a couple friends to load it onto his vehicle, and then has the police calling on him to hand it over. Does he own it under the principle of “finders keepers”, does it belong to the owner of the land where it was found, does it
Stratigraphy.net | Impressum
Ads: