Himalayas

The most spectacular mountain range on planet Earth. Containing the worlds highest peaks, it is certainly quite a sight. I, being no great mountaineer went trekking in the lowlands and returned late last night. 


It was extremely cold, but the mountains were stunning, so it was all worth it. We have reached our second boundary type! So here goes the science....
 The Himalayas are a result of the "Convergent Collision" boundary type, located at approximately: 27°59′17″ N  86°55′31″E. 
Convergent collision is where two plates move towards one another, resulting in a continental collision. The plates resist subduction and the crust of the plates moves up, raising land creating mountains where a trench would be. This process is called Orogeny. Orogens develop when the continental plate is somewhat "crumpled" to form mountain ranges. The Himalayas were formed when India "collided" with Asia, so when the northern moving Indo-Australian Plate merged into the Eurasian Plate. The plate pushed up into the other creating the Himalayas, referred to as a "fold mountain." Each year, the Indo-Australian plate moves 67 mm north into Eurasia. This means that the highest peaks in the world are growing taller yet, every moment! (To be exact, they rise 5 mm per year meaning they are geologically active.)

This is a great picture, depicting India's journey over the years: 

http://en.wikipedia.org/wiki/File:Himalaya-formation.gif


Diagram of the Himalayas and tectonics: 

http://www.moorlandschool.co.uk/earth/earth_science/Himalayas_collision.gif


The gorgeous Himalayas: 

http://media.nowpublic.net/images//70/d/70d2b6e0e5f3d8894f4420299b838b17.jpg

K2, the second highest peak:

http://images.wikia.com/synchromystic/images/0/07/K2.jpg

The peaks along with the Tibetan Plateau: 

http://mapstor.com/data/images/articles/mountain-formation/tibet-himalayas-from-space.jpg


Hope you are enjoying the blog so far! Now I'm off to New Zealand for our second to last boundary. I'll update you soon...
Feri Bhetaula!

Side stop... New Zealand!

So welcome back. I've decided to take a day or two off from geology and soak up some rays.

I'm staying in a hostel in Auckland. I couldn't resist the absolutely stunning scenery!

Here are some pictures I took after a long day of sightseeing.... Enjoy!

This is the marina:

http://www.mkiwi.com/photos/Auckland/photographs/Westhaven_Marina_Auckland_New_Zealand.jpg

This seems really familiar... where have I seen such similar architecture before...

http://blather.net/abroad/newzealand/_MG_7487_sky_tower_500.jpg

Piha Beach:

http://wallpapers.wallpapersdepo.net/free-wallpapers/3179/Piha-Beach-New-Zealand.jpg

Simply ravishing: 

http://coalcountry.files.wordpress.com/2011/03/world_new_zeland_new_zealand_trip_007645_.jpg

Well that's all for now. Wishing you were here? That's what I thought... More to come!

Alpine Fault

I've just returned from my day of touring the South Island. This is a such a beautiful place! I can't even begin to tell you. 

So, if you've ever been to  the South Island you will have seen or at least heard of the Southern Alps. They run along the northwest edge of the island, which is exactly where the Alpine Fault is. Well that moves us on to our 3rd boundary type! The Alpine Fault forms a "transform" boundary between the Pacific Plate and Indo-Australian Plate. Located at 43°53'44.58"S  169°31'28.09"E, it runs the entire length of New Zealand's South Island, thus along the western edge of the Southern Alps. It also aligns with the Macquarie Fault Zone... Interesting... So, Transform boundaries are a bit more confusing than the others, so bear with me.

A transform fault or boundary is where the tectonic motion is primarily horizontal meaning they slide past each other. This lateral motion of one plate against another can show faults in the surface crust (As the Alpine Fault shows through the Southern Alps) The sliding motion also causes lots of earthquakes along the fault line.

Here is a record of the most recent earthquakes in relation to the Alpine Fault:

1848 - Marlborough, estimated magnitude = 7.5
1888 - North Canterbury, estimated magnitude = 7.3
1929 - Arthur's Pass, estimated magnitude = 7.1 
1929 - Murchison, estimated magnitude = 7.8 
1968 - Inangahua, estimated magnitude = 7.1 
Most Recent: 
2003 - Fiordland, estimated magnitude = 7.1
2009 - Fiordland, estimated magnitude = 7.8

Here is a diagram showing how Transform boundaries work: 

http://en.wikipedia.org/wiki/File:Transform_fault-1.svg

This shows the Australian Plate and Pacific Plate:

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrT78u2ehRbSanap6LHhzfoIYEoYXYKr6VeZpm1d3_dBZpNHKtcIWxXqs973nIp0FS_oa9_h6y4RMsObZ2ko2PXDF3waAXvk4XTb1SUBkMhPeKyWgMbnauWR8mUUg9JkrwF0rANXccWT4/s400/060824.NZ.Alpine.fault.jpg

This is clearly defined Alpine Fault (notice how it lines up with the mountain range):

http://www.gns.cri.nz/var/ezwebin_site/storage/images/media/images/alpine-fault-map/4311-1-eng-GB/Alpine-fault-map_large.jpg

An aerial view of the Southern Alps:

http://en.wikipedia.org/wiki/File:South_Island_blizzard_2003.jpg

Well sadly this brings us to our last boundary! It's off to the United States. In fact, Seattle! Home sweet, home. Good planning on my part eh? 

Talk to you in the good ole rainy Sea-town my loyal geology followers....

Rainy Rainier

Well this brings me to our last boundary... It also returns me to my home town, Seattle. Rain, rain and more rain is all I can say. It makes me wonder why I ever came back. And then I remember the lovely volcano, Mount Rainier. This local phenomenon is a result of the last boundary type called "convergent subduction". 



http://tasaclips.com/illustrations/Convergent_Boundary.jpg


Well great, but what on earth does that mean? It is when two plates move towards one another (in this case oceanic and  continental) and one slides under the other. (This also forms a trench at the convergence point.) The oceanic plate slides beneath the continental plate because it is denser. You may be thinking "What? How come?" Well here is a simplified explanation. Imagine you have a cup of water with Styrofoam pieces in it. Naturally the Styrofoam will rise to the top because it is lighter. The continental plate is the less dense Styrofoam. 

So now back to how this made a volcano. Well, when the oceanic plate (Juan de Fuca)  slides under the continental plate (North American Plate), it sinks into the Earth's mantle which we all know is extremely hot. It melts the rock, creating magma, which rises because it is less dense than the rock. These magmas continue rising until they get to the earth's surface, producing a volcanic eruption. Subduction zones are a basis for long chains of volcanoes called 'volcanic arcs' that are parallel to the zone.

Mount Rainier is a stratovolcano that is part of the Cascadia Subduction Zone, located in the Cascade Range at 46˚51'10"N 121˚45'37"W.  It happens to be the most prominent mountain in the contiguous U.S. and has an elevation of 14,411 ft. It's prominence is 7 meters greater than that of K2. (WOW!) Because of it's structure and internal chemistry it is one of the most  dangerous volcanoes. If it were to erupt, it could produce massive lahars as it did 5,600 years ago when it's wall of mud covered 130 square miles. Lahars can destroy anything their path because of the extreme force/speed. Even worse, when it finally stops moving, the mud 

solidifies creating even more problems. 

Although it's last eruption was in 1884 it has landed itself on the Decade Volcano list, earning perpetual investigation of its dangers, and future eruption possibilities.

The following volcanoes were selected as the 16 current Decade Volcanoes:  

• Avachinsky-Koryaksky, Kamchatka,Russia
• Colima, Jalisco and Colima, Mexico
• Mount Etna, Sicily, Italy
• Galeras, Nariño, Colombia
• Mauna Loa, Hawaii, USA
• Mount Merapi, Central Java, Indonesia
• Mount Nyiragongo, Democratic Republic of Congo
• Mount Rainier, Washington, USA
• Sakurajima, Kagoshima Prefecture,Japan
• Santa Maria/Santiaguito, Guatemala
• Santorini, Cyclades, Greece
• Taal Volcano, Luzonbatangas,Philippines
• Teide, Canary Islands, Spain
• Ulawun, New Britain, Papua New Guinea
• Mount Unzen, Nagasaki Prefecture,Japan
• Vesuvius, Naples, Italy

  But let's not worry about that right now, and just enjoy the marvelous views it provides:

http://rpmedia.ask.com/ts?u=/wikipedia/commons/thumb/e/eb/Mount_Rainier_from_west.jpg/120px-Mount_Rainier_from_west.jpg

http://www.stanford.edu/~thelero/images/photography/Mount%20Rainier.jpg

http://www.bschool.com/media/images/WA/Tacoma,_Washington-Mount_Rainier_over_Tacoma.jpg

http://www.cornforthimages.com/galleries/Landscape/Washington/Mount%20Rainier/Mt%20Rainier%20Lenticular%20Cloud%20Aerial_Mount%20Rainier%20National%20Park,%20Washington.jpg

http://www.imageof.net/bulkupload/wallpapers13/Landscapes/Mount%20Rainier%20Washington.jpg

So unfortunately this brings me to say goodbye. I have loved being able to share my experiences with you, and with bit of luck, hopefully you learned a little about plate tectonics. 

Thank you for your support! I can't wait to see what the USGS thinks of my travels...

Adieu fellow geologists, and keep up your interests in Earth science! The learning never ends!

If you were a fan....

Hello everyone!

So if you have been following my trip then you will probably enjoy watching my tectonic tour I made to go along with my trip. It was made in Google Earth, and is from a birds eye view: 

Click the link to view! 

Google Earth Tectonic Tour

(You'll have to download it to watch it--Sorry!)

Thanks for being such great followers! 

Sincerely, 
Sadie