Overblog
Editer la page Suivre ce blog Administration + Créer mon blog

Earth of fire

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

Publié par Bernard Duyck
Publié dans : #Actualités volcaniques

The alert level of Shishaldin volcano has been reassessed  to WATCH and Orange on 03/28/2014 by the AVO .

Elevated surface temperatures was detected from March 18 by satellites , and persists to this day , in relation to the presence of lava in the summit crater . Seismographs record small explosions intermittently since the same date. The activity remains confined in the deep crater without flows on the flanks .

Shishaldin - Landsat 8 showing the emission of heat from the lava in the summit crater , the 18.03 and the 27.03.2014 - doc . AVO / USGS / Schneider D

Shishaldin - Landsat 8 showing the emission of heat from the lava in the summit crater , the 18.03 and the 27.03.2014 - doc . AVO / USGS / Schneider D

The Shishaldin is the highest volcano of the Aleutian volcanic arc,  with his top at 2.857 meters. This symmetrical stratovolcano, located on Unimak Island , has a basal diameter of 16 km. and a small summit crater from which emerges a permanent small plume of steam. It is flanked to the northwest by 24 monogenic cones parasites.

The Shishaldin cone is relatively recent, less than 10,000 years , and is built on the remains of an ancient somma eroded by glaciers, and based on volcaniclastic rocks of late Tertiary .

Its last eruption was in 2004 ( GVP )

Aleuts call this volcano Sisquk , meaning " mountain pointing the way when I 'm lost ."

Location of Shishaldin in the Aleutian arc - doc . AVO / USGS

Location of Shishaldin in the Aleutian arc - doc . AVO / USGS

Shishaldin - Small plume taken by the webcam on January 28, 2014 - Doc. AVO / USGS / Janet Schaefer

Shishaldin - Small plume taken by the webcam on January 28, 2014 - Doc. AVO / USGS / Janet Schaefer

Sources :

- Alaska Volcano Observatory - link

- Global Volcanism Program - Shishaldin

Articles récents

Hébergé par Overblog