Friday, April 24, 2020

Major Volcanoes of the World


Major Volcanoes of the Earth

Sl. No.
Name of the Volcano
Phenomenon
Location
Erupted in
Death Toll
1
Mt. Krakatoa
Active
Indonesia
August 27, 1983
36,000
2
Deccan Trap
Extinct, Shield
India
60 Million years ago
-
3
Mt. Tambora
Active
Indonesia
1815
71,000
4
St. Helens
ActiveStrato, Dome, Basaltic & Andesite
USA
1980
57
5
Mt. Pinatuba
Strato,
Philiphines
1991
350
6
Novarupta
Shield
Alaska
1912
-
7
Santorini
Extintct
Aegean Sea
3500 years ago
-
8
Mt. Vesuvius
Strato, Dormant
Italy
0079
3360
9
Yellowstone Supervolcano
Extintct,
USA
6,30,000 years ago
-
10
Laki
Dormant
Iceland
1783
9,300
11
Mt. Kelut
Activestrato
Indonesia
1586
10,000
12
Mt. Kelut
Activestrato
Indonesia
1919
5,500
13
Unzen
Dormant
Kyushu, Japan
1792
15,000
14
Nevada del Ruiz
Dormant
Columbia
Nov. 13,1985
25,000
15
Mt. Pelee
Dome
West Indies
1902
36,000
16
Mt. Etna
Activestrato, Basaltic & Andesite eruption
Sicily Island, Italy
1669
20,000
17
Mt. Stromboli
Active
Italy
2019
1
18
Mt. Fuji
Activestrato, Basaltic eruption
Japan

-
19
Mauna Loa
Active, Shield, Basaltic  eruption
Hawaii Islands
1984
Non explosive
20
Mayon
Activestrato, Basaltic  eruption
Philiphines
1897
1,335
21
Popocatepetl
Active, Andesite eruption
Mexico

-
22
Kilauea
Active Shield,
Hawaii Islands
1790
400
23
Kilimanjaro
Dormant
Tanzania
2,00,000 years ago
-
24
Sakurajima
Stratoactive
Japan
2009
-
25
Mt. Merapi
Active
Indonesia
Oct 2010
400
26
Mt. Merapi
Active
Indonesia
1930
1,350
27
Tall
Active
Philippines
1977
5,500
28
Mt. Nyiragongo
Active
Congo
2002
245
29
Eyjafjallajokull
Active
Iceland
2010
-
30
Mt. Ontake
Active
Japan
2014
63
NB: Some volcanoes erupt aftermath of the earthquake. Some other eruptions influence  in    climatic and economic impacts. So the death toll may vary. Most of the Economists believe that “More people died aftermath the impacts of the eruption due to climatic and economic factors   than the Lava flow”.


Thursday, April 23, 2020

Classification of volcanoes

                                                              Volcanos


1
Volcano
The inner molten magma  of the interior of the earth erupts on the surface of the earth through the vent is known as volcano
2
Types of volcanoes
I)                    Based on the frequency of eruption, volcano is divided into three types.  1) Active volcano, 2) Dormant volcano, 3) Extinct volcano.
II)                  Based on nature of eruption, they are divided into two types.   1) Central type of volcano, 2) Fissure type of volcano.
III)                Based on nature  of eruption matter, they are classified into two  types.  1) Explosive Type, 2) Placid Type.
IV)               Based on after eruption, they are classified into four types. 1) Lava Dome, 2) Shield volcanoes, 3) Cinder Cone, 4) Composite Volcano.
3
Active volcano
Active volcanoes erupt in fairly frequent intervals. They are alive volcanoes. Ex:  Mt. Etna in Italy (Europe) is an active stratovolcano.
4
Dormant volcano
The volcano erupted in the past and may be erupted in future. They are sleeping volcanoes. Ex: Mt. Kilimanjaro in Tanzania (Africa)
5
Extinct volcano
The volcano erupted in the long ago and never erupted again. They are dead volcanoes. Ex: Mt. Kulal in Kenya (Africa)
6
Central type of volcano
The volcano erupts at a central point of the vent and forms a conical shape of hill. Ex: Mt. Vesuvius in Italy (Europe)
7
Fissure type of volcano
 The magma erupts and spread  the surface, forms shields or plateau. Ex: Mt. Ray in Canada (N. America)
8
Explosive type of volcano
Huge volume of gas, steam, rocky particles, dust, smoke erupt with great force. Ex: Mt. Krakatoa in Indonesia (Asia)
9
Placid type of volcano
The magma rises to the surface quietly with low intensity. Ex: Mauna Loa in Hawaiian Islands in Central Pacific Ocean.
10
Lava Dome
Slow extrusion of the viscous magma forms Lava Dome. Ex: St. Helens in USA
11
Shield volcano
Forms by low viscosity highly fluid lava. Ex: Mt. Kilauea in Hawaiian Islands.
12
Cinder cone
conical shaped land forms around the vent on the surface of the earth. Ex: MT. Mauna Kia in Hawaiian Islands.
13
Composite volcano
Volcanic hill formed my alternative layers of lava is a Composite volcano this is known as Strato volcano. Ex: Mt. Fuji in Japan (Asia)
14
Vent
Vent is a narrow pipe like shape which ejects from interior to surface of the earth as lava
15
Magma
Magma is the molten form of the rocks found in the interior of the earth.
16
Lava
The inner molten magma when flows on the surface of the earth is known as lava
17
Volcanoes of India
Barren Island in Andaman region  is the only volcano in India. This is an active volcano and lastly erupted in 2017. Narcondam Island is the dormant volcano located in Andaman Sea. Baratang Island in Andaman region is the active mud volcano in India.

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