- published: 28 May 2010
- views: 196
Phreatomagmatic eruptions are defined as juvenile forming eruptions as a result of interaction between water and magma. They are different from magmatic and phreatic eruptions. The products of phreatomagmatic eruptions contain juvenile clasts, unlike phreatic eruptions, and are the result of interaction between magma and water, unlike magmatic eruptions. It is very common for a large explosive eruption to have magmatic and phreatomagmatic components.
Several competing theories exist as to the exact mechanism of ash formation. The most common is the theory of explosive thermal contraction of particles under rapid cooling from contact with water. In many cases the water is supplied by the sea, for example with Surtsey. In other cases the water may be present in a lake or caldera-lake, for example Santorini, where the phreatomagmatic component of the Minoan eruption was a result of both a lake and later the sea. There have also been examples of interaction between magma and water in an aquifer. Many of the cinder cones on Tenerife are believed to be phreatomagmatic because of these circumstances.
A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex.
More precisely, it is the solid figure bounded by a base in a plane and by a surface (called the lateral surface) formed by the locus of all straight line segments joining the apex to the perimeter of the base. The term "cone" sometimes refers just to the surface of this solid figure, or just to the lateral surface.
The axis of a cone is the straight line (if any), passing through the apex, about which the base (and the whole cone) has a circular symmetry.
In common usage in elementary geometry, cones are assumed to be right circular, where circular means that the base is a circle and right means that the axis passes through the centre of the base at right angles to its plane. Contrasted with right cones are oblique cones, in which the axis does not pass perpendicularly through the centre of the base. In general, however, the base may be any shape and the apex may lie anywhere (though it is usually assumed that the base is bounded and therefore has finite area, and that the apex lies outside the plane of the base).
Tuff (from the Italian tufo) is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is compacted into a solid rock in a process called consolidation. Tuff is sometimes called tufa, particularly when used as construction material, although tufa also refers to a quite different rock. Rock that contains greater than 50% tuff is considered tuffaceous.
Tuff is a relatively soft rock, so it has been used for construction since ancient times. Since it is common in Italy the Romans used it often for construction. The Rapa Nui people used it to make most of the moai statues in Easter Island.
Tuff can be classified as either sedimentary or igneous rocks. They are usually studied in the context of igneous petrology, although they are sometimes described using sedimentological terms.
The material that is expelled in a volcanic eruption can be classified into three types:
Seongsan Ilchulbong, also called ‘Sunrise Peak’, is an archetypal tuff cone formed by hydrovolcanic eruptions upon a shallow seabed about 5 thousand years ago. Situated on the eastern seaboard of Jeju Island and said to resemble a gigantic ancient castle, this tuff cone is 182 meters high, has a preserved bowl-like crater and also displays diverse inner structures resulting from the sea cliff. These features are considered to be of geologic worth, providing information on eruptive and depositional processes of hydromagmatic volcanoes worldwide as well as past volcanic activity of Seongsan Ilchulbong itself.
Seongsan Ilchulbong Tuff Cone was formed by Surtseyan-type hydrovolcanic activity upon a shallow seabed about 5,000 years ago when the sea level was same as the present (Sohn & Chough, 1992; Sohn et al., 2002). Most volcanic cones or oreums (Jeju dialect for volcanic cones) were formed by piles of scoria cones which are created by Hawaiian eruptions or Strombolian eruptions. But Seongsan Ilchulbong Tuff Cone and a few other oreums on Jeju Island were hydromagmatic volcanoes which were made by piles of volcanic ash, the interaction of hot ascending magma and seawater or ground water. Seongsan Ilchulbong Tuff Cone is 180 meters high, and its crater is about 600 meters in diameter. It has a dip of strata up to 45 degrees and is 90 meters from sea level to the crater floor.
Seongsan Sunrise Peak on JEJU ISLAND, South Korea. A very beautyful place!
Seongsan Ilchulbong hình nón được hình thành từ 5.000 năm trước đây bởi sự phun trào dưới đáy biển nông. Với cấu trúc bên trong khác nhau dựa theo vách đá ven biển và miệng núi lửa nên tạo hình dáng trông giống như một cái bát. Trừ phía Tây Bắc, tất cả các mặt đều bị xói mòn bởi sóng biển, hình thành các trầm tích kết hợp tạo nên cảnh quan đặc biệt, mang lại vẻ đẹp không thể mô tả của Seongsan Ilchulbong. Đó là lý do tại sao nhiều người tụ tập ở nơi này vào buổi sáng năm mới để xem mặt trời mọc. Ngoài ra, nó cũng được công nhận trên toàn thế giới như là một cơ sở để nghiên cứu sự phun trào núi lửa trong quá khứ và quá trình lắng đọng của ngọn núi lửa nước. Đảo Jeju-do đã được công nhận là một trong các Công viên địa chất thế giới của UNESCO vào tháng 10 năm 2010. https://www.ijto.or.kr/vi...
Seongsan Ilchulbong Tuff Cone in Jejudo
Seongsan Ilchulbong Tuff Cone in Jejudo
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After spending a week in Seoul we met up with Sonia's family and headed for beautiful Jeju Island. The weather was pretty terrible for most of the time that we were there but we made the most of the little sunshine we got and saw an amazing field of silver grass that can only be seen in Autumn. SAN-GUM-BU-RI (산굼부리) | A crater with a circumference of 2km. Beautiful all year round but especially in Autumn. SUNG-SAN (성산) | A 182m high tuff cone created by hydrovolcanic eruptions. Takes approx 50 mins to climb to the top and back with an amazing view at the peak. ALIVE MUSEUM (박물관은 살아있다) | Trick museum with paintings and installations that create optical illusions. Sorry about the late update guys. We have been on the go non-stop for about 2 weeks now. We are currently uploading from Kyoto...
outh Korea Seongsan Ilchulbong Seongsan Ilchulbong, also called ‘Sunrise Peak’, is an archetypal tuff cone formed by hydrovolcanic eruptions upon a shallow seabed about 5 thousand years ago. Situated on the eastern seaboard of Jeju Island and said to resemble a gigantic ancient castle, this tuff cone is 182 meters high, has a preserved bowl-like crater and also displays diverse inner structures resulting from the sea cliff. These features are considered to be of geologic worth, providing information on eruptive and depositional processes of hydromagmatic volcanoes worldwide as well as past volcanic activity of Seongsan Ilchulbong itself. more info : www.en.wikipedia.org/wiki/Seongsan_Ilchulbong
Mixmag & Smirnoff Sound Collective present Lab NYC Connect with Tim Sweeney : http://www.soundcloud.com/timsweeney / http://www.facebook.com/bisradio Beats In Space Radio: Show: http://www.beatsinspace.net Warmup set from Hawaiian duo Eric & Farley of Tuff Cone: https://www.facebook.com/tuffcone More Smirnnoff Sound Collective videos: http://www.mixmag.net/sound-collective The Lab is powered by Void Acoustics: http://www.voidacoustics.com The Lab New York is Mixmag and Smirnoff Sound Collective's weekly afterwork party where we stream the best American and international DJs, live from our private, Brooklyn location. This Friday, November 6, we are excited to host a New York staple, Beats in Space label honcho and radio host, Tim Sweeney.
Travel video about nature park Kapadokya in Turkey. In Central Anatolia within the heart of Turkey is a remarkable and captivating landscape, Cappadocia, a region mainly known for its strange looking volcanic rock landscapes. In some areas it looks almost extraterrestrial and extends for around four thousand square kilometres.The geological and scenic structure of Cappadocia was mainly formed by the interaction of two powerful natural forces. The first was created thirty million years ago when the region contained a number of highly active volcanoes that covered the land with ash. The ash compacted and was transformed into tuff stone. The second was the mighty power of erosion that gradually eroded the tuff stone and formed an amazing variety of rock formations.. The Fairy Chimneys of Devr...
Like us - https://www.facebook.com/jungletechnoclassics Tracklist A1) Noise Factory - Box Bass - Ibiza Records A2) Science Lab - Flesh & Blood (Which Mix ??) - Mental Radio A3) Intellectual Harmonious Sanction - Drift & Dream - R&S; A4) Turntable Terror - Scream - Invasion Recordings A5) Doctor Of Dance - Doctor Of Dance Theme - Brutal Records A6) Techno Too - Jet-Star - D-Zone Records A7) Kings Of Peace - 1000 (Peak Energy Mix) - Debut A8) The Raid - Jump Up In The Air - Lumar Music A9) Psychotic - Psychotic (Hypnopulse Mix) - SSR Records A10) Red Shift - The Tingler - Pro-One A11) One Tribe - Is This All (Instinctrumental) - Dance Wax Records A12) Co Dependents Of Knowledge - Silk Cut (Extra Mild Mix) - C.T. Records A13) Trance Trax - A-Cone - Beat Box International A14) Nautilus - Terro...
Channel Listing of episodes https://sites.google.com/site/mineguy101/home/lessons This geology course through Laurentian University in Ontario. "Understanding the Earth" originally aired on TVO Ontario in 1975 and rebroadcasted in 1986 Fundamentals of volcanoes - Location of Volcanoes in relation to plates, Products of Volcanoes Planet of Man Series -- Fire Within (30minutes) Starring; Tuzo Wilson -- renowned Canadian geophysicist Planet of Man Series -- Fire Within Lesson 5 -- Part 1 of 7 •Illustration showing a crossection of Europe with respect to plates •Occur at plates are colliding and pulling apart •Vulcan the roman god of fire and earthquakes •Mt Fugi Fire festival in japan "to soothe the restless God" •Illustration showing distribution of volcanoes along the plates •Two plate...
In Central Anatolia within the heart of Turkey is a remarkable and captivating landscape, Cappadocia, a region mainly known for its strange looking volcanic rock landscapes. In some areas it looks almost extraterrestrial and extends for around four thousand square kilometres. The geological and scenic structure of Cappadocia was mainly formed by the interaction of two powerful natural forces. The first was created thirty million years ago when the region contained a number of highly active volcanoes that covered the land with ash. The ash compacted and was transformed into tuff stone. The second was the mighty power of erosion that gradually eroded the tuff stone and formed an amazing variety of rock formations.. The Fairy Chimneys of Devrent Vadisi date back to the original in...
Come into my room
Come into my Shrine
I got 40 televisions
All going at the same time
We don't need to go to clubs or parties anymore
We just lie right here on the floor
Television
Oh television
Let's do it with the T.V. on
With the T.V. on
We can stay awake in steamy glitter dreams
Flick a switch a change in every scene
Don't ya love it when we lose control
Just you and me... Mmm electric soul
Television
Oh television
Let's do it with the T.V. on
With the T.V. on
The transmission is coming through so clear tonight
The satellites they must know the meaning of life
Some people go to London
Some people go too far
We don't have to move
It's the state of art
See the way they watch us
See the way they kiss
We can speak in tongues
We don't have to move our lips
Television
Oh television
Let's do it with the T.V. on
With the T.V. on
Television