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More information from NOAA on volcanoes...

USGS Volcano Status Messages:
Pavlof Daily Update issued Jul 29, 2014 12:58 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Details...

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volcano

 

Volcanoes

The word volcano comes from the island of Vulcano in the Mediterranean Sea. Long ago people thought this island mountain was the chimney of the blacksmith forge of the Roman God Vulcan. The steam and ash that came out of the vent was a sign that Vulcan was working at his forge making weapons for Jupiter and Mars. In Hawaii and other Polynesian islands, local people once attributed volcanic eruptions to the Goddess Pele. They believed Pele was moving from island to island as she sought to escape her evil sister, Na Maka O Kaha'i, the goddess of the sea. Today, scientists understand that volcanic eruptions are surface reminders of Earth's still hot interior.

The ash cloud formed by the May 18, 1980, eruption at Mount Saint Helens, WA
The ash cloud formed by the May 18, 1980, eruption at Mount Saint Helens, WA. More images...
Sixty percent of all active volcanoes are found at crustal plate boundaries such as the Pacific Plate. Earth's crust, like the cracked shell of a hard-boiled egg, is broken into a number of "plates". These floating pieces of crust are moving about very slowly on the hotter interior. Where the plates are moving apart or colliding with one another, volcanoes may form. Volcanoes also form oceanic islands in the Pacific Ocean or Mediterranean Sea where "hot spots" occur in the crust and mantle.

Many kinds of volcanic activity can endanger the lives of people and property. Most of the activity involves the explosive ejection or flowage of rock fragments and molten rock. Volcanoes that erupt explosively can send particles as far as 20 miles high and many miles away from the volcano. The volcanic ash from these types of eruptions is a significant hazard to aviation. If an airplane flies into a volcanic cloud, it can lead to engine damage and malfunction and to many other kinds of aircraft damage. Volcanic eruptions near coastlines can generate damaging tsunami waves that can cause death and destruction among coastal communities. To ensure safe navigation and monitor possible climatic impact, NOAA records global historic volcanic eruptions, tracks volcanic ash eruptions affecting the United States, issues volcanic ash advisories and provides ash cloud forecasts. For more information on volcanoes, visit NOAA's Volcano website.



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Recent Volcano Observatory Activity Reports from USGS


Pavlof Daily Update issued Jul 29, 2014 12:58 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
No activity observed in partly cloudy satellite images, and seismicity remains very low. Details...

Semisopochnoi Daily Update issued Jul 29, 2014 12:58 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Earthquakes continue to be recorded. Satellite images have been cloudy over the past day. AVO has received no reports from pilots or mariners of any unusual activity. Details...

Cleveland Daily Update issued Jul 29, 2014 12:58 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Unrest continues. Satellite observations show slightly elevated surface temperatures in the summit crater. Details...

Shishaldin Daily Update issued Jul 29, 2014 12:58 Volcano Alert Level WATCH - Aviation Color Code ORANGE
Low-level eruptive activity continues. Elevated surface temperatures were observed in the summit crater over the past day. Nothing unusual was observed in webcam images. Details...

Kilauea Daily Update issued Jul 29, 2014 09:02 Volcano Alert Level WATCH - Aviation Color Code ORANGE
Activity Summary: Kīlauea continued to erupt at its summit and within the East Rift Zone, and gas emissions remained elevated. The summit lava lake level fell slightly. At the middle East Rift Zone, lava flows continued to erupt from the northeast flank of Puʻu ʻŌʻō cone, spreading to the northeast. Recent Summit Observations: Kīlauea's summit inflation ended yesterday morning at about 9 AM. Since then, there has been no significant inflation or deflation. The lava lake level dropped slightly over the past day to 3540 m below the Overlook ... Details...

Pavlof Daily Update issued Jul 28, 2014 13:00 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
No activity observed in partly cloudy satellite images, and seismicity remains very low. Details...

Semisopochnoi Daily Update issued Jul 28, 2014 13:00 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Earthquakes continue to be recorded. Satellite images have been cloudy over the past day. AVO has received no reports from pilots or mariners of any unusual activity. Details...

Cleveland Daily Update issued Jul 28, 2014 13:00 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Unrest continues. Satellite observations during clear periods show slightly elevated surface temperatures in the summit crater. AVO has received no reports from pilots or mariners of any eruptive activity. Details...

Shishaldin Daily Update issued Jul 28, 2014 13:00 Volcano Alert Level WATCH - Aviation Color Code ORANGE
Low-level eruptive activity continues. Elevated surface temperatures were observed in the summit crater over the past day. Web camera observations mostly obscured by clouds. Details...

Kilauea Daily Update issued Jul 28, 2014 07:18 Volcano Alert Level WATCH - Aviation Color Code ORANGE
Activity Summary: Kīlauea continued to erupt at its summit and within the East Rift Zone, and gas emissions remained elevated. Summit inflation over the past day was mirrored by a rise summit lava lake level. At the middle East Rift Zone, lava flows continued to erupt from the northeast flank of Puʻu ʻŌʻō cone, spreading to the northeast. Recent Summit Observations: Kīlauea's summit inflated steadily over the past day, accompanied by a rise in lava lake level to 3035 m below the Overlook crater rim. Seismic tremor was low with two dropouts ... Details...


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