Suivre ce blog
Administration Créer mon blog

Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Two volcanoes are active in Sumatra at the moment: the Sinabung and the Marapi !

indonesia sumatra 02
                                  Location volcanoes on Sumatra - doc Face of the earth

Thursday, January 9 , Gunung Marapi recorded five explosives episodes between
5:34 p.m. and 7:14 p.m., PVMBG officials said, accompanied by small ash plumes amount to about 250 m above the top and a steam plume surmounted the volcano to 20h . The eruptions are due to increased seismicity since January 1 .
The VSI has maintained alert level II  / IV , but recommended not to approach the volcano within a radius of 3 km. ( Republika on line )

gunung-marapi - Antara Arif Pribadi                  
The Gunung Marapi - undated photo Antara / Arif Pribadi

The activity continues, stable and always intense, on Sinabung.

The dome is continuously fed and produced numerous pyroclastic flows , always in the same ravine , always of the same magnitude . The past 48 hours the only notable change is the direction in which it flows, towards the south -east in the beginning of crisis, however, still largely in the area of ​​7 km ( only a few flows are little more than 4 km long and the longer reach 4,5 km) .

2014.01.08 Sinabung - Sutanta Aditya AFP
Sinabung - 01/08/2014 - Flow and co- pyroclastic cloud - light gray deposits of preceding pyroclatic flows - photo Sutanta Aditya / AFP

Ash cause a lot of inconvenience to the people : the ashes are deposited on the fruit, preventing photosynthesis and ripening of the fruit.

In contact with moisture and rain , they turn into a compact cement which does not allow breathing the soil, when they are not washed away, turning into lahars that carry plants.

2014.01.10 Sinabung sibintun village - Roni Bintang Reuters
Sinabung - 10/01/2014 - ash stick on oranges and leaves, near the village of Sibintun town - photo Roni Bintang / Reuters

The gas and ash affect the airways of people, and play a key role in the development of pulmonary fibrosis (silicosis) ... inhaled crystalline silica is classified as a carcinogen . Gases are also due to acids rains by combination with moisture.

2014.01.04 Sinabung - Ulet Ilfansas Getty im
A woman carries her daughter up in his field , while the Sinabung emits a pyroclastic cloud - 04.01.2014 - photo Ulet Ifansasti / Getty Images
 Snb 31014 1
                           Seismic Activity of Sinabung in recent weeks - report VSI 3 to 10/1/2014



Sources :

- VSI - Badan geologi - link

- Presse locale : Jakarta post - Republika on line.

Articles récents

Hébergé par Overblog