Monthly Archives: March 2009

Koryaksky, Kamchatka Peninsula, Russia

KVERT reported that seismic activity at Koryaksky was elevated on 6 and 8 March and at background levels on the other days during 7-13 March. Observers reported that gas plumes containing a small amount of ash rose to an altitude … Continue reading

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Hunga Ha’apai, Tonga

Observers flying near the area of Hunga Tonga-Hunga Ha’apai (about 62 km NNW of Nuku’alofa, the capital of Tonga) on 16 or 17 March reported seeing an eruption. Photos showed an eruption plume with a wide base that rose from … Continue reading

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Galeras, Colombia

INGEOMINAS reported an explosive eruption from Galeras that began at 1555 on 13 March; the Alert Level was raised from II (Orange; “probable eruption in term of days or weeks”) to I (Red; “imminent eruption or in progress”), on a … Continue reading

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Ebeko, Kuril Islands, Russia

Based on analysis of satellite imagery and information from Yelizovo Airport, the Tokyo VAAC reported that on 13 March an ash plume from Ebeko drifted E at an altitude of 0.6 km (2,000 ft) a.s.l. Source: Tokyo Volcanic Ash Advisory … Continue reading

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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

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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

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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