Monthly Archives: March 2009

Ashfall from Shiveluch Volcano, Kamchatka

NASA’s Earth Observatory recently posted this amazing image of ashfall from Shiveluch. The Shiveluch (sometimes spelled Sheveluch) Volcano is the most active of the arc of volcanoes that dot northeast Russia’s Kamchatka Peninsula. Lava domes build and collapse fairly regularly … Continue reading

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Semeru, Eastern Java, Indonesia

On 6 March, CVGHM reported that an ash eruption from Semeru was characterized by increased seismicity and booming sounds from the Jonggring Seloko crater; fog prevented visual observations. The Alert Level was raised to 3 (on a scale of 1-4). … Continue reading

Posted in Volcano Activity Reports | Tagged

Sakura-Jima, Japan

During 7-10 March, JMA reported that 12 Vulcanian explosions occurred from Showa Crater, on the E flank of Sakura-jima. Some explosions were seen from JMA’s Kagoshima Observatory; observers reported that ejected bombs landed as far away as 800 m from … Continue reading

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Koryaksky, Kamchatka Peninsula, Russia

KVERT reported that seismic activity at Koryaksky was above background levels on 3 March and at background levels on the other days during 27 February-6 March. Observers reported that during 3-5 March gas plumes containing a small amount of ash … Continue reading

Posted in Volcano Activity Reports | Tagged

Minchinmavida and Chaiten Volcanoes, Chile

The Andes Mountains along the western coastline of South America include numerous active stratovolcanoes (steep-sided, cone-shaped volcanoes). The majority of these volcanoes were formed and are still fed by magma generated as the Nazca tectonic plate under the southeastern Pacific … Continue reading

Posted in News

How does a thermocouple measure the temperature of lava without melting?

A thermocouple works on the principle that the electrical resistance at the point where two wires of different composition join, is very sensitive to the temperature. So…a thermocouple consists of two wires joined to an electrical source. Current passes through … Continue reading

Posted in FAQ

How do volcanoes help scientists learn about the Earth’s interior?

The deepest samples of the Earth’s interior brought up from drill holes come from a depth of 12 km . . . . volcanoes provide direct samples of the Earth’s interior from much greater depths . . at least 100 … Continue reading

Posted in FAQ