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More information from NOAA on volcanoes...

USGS Volcano Status Messages:
Kilauea Status Report issued Oct 30, 2014 18:17 Volcano Alert Level WARNING - Aviation Color Code ORANGE
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


Kilauea Status Report issued Oct 30, 2014 18:17 Volcano Alert Level WARNING - Aviation Color Code ORANGE
Scientists of the USGS Hawaiian Volcano Observatory conducted ground observations of the June 27th lava flow on Thursday, October 30, 2014. As of 5 PM, HST, the leading edge of the flow had stalled approximately 155 meters (170 yards) in a straight line distance from Pāhoa Village Road. The flow advanced only about 30 meters (33 yards) over the past 24 hours. The leading edge is inflated with a few small oozing breakouts just behind the flow front, however, so it is possible that the flow may advance again without warning. A new outbreak of lava occurred from the northern margin of ... Details...

Pagan Weekly Update issued Oct 31, 2014 10:03 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
Seismic, infrasound, and web camera data from Pagan Volcano remain temporarily unavailable. A typical steam and gas plume was observed in some satellite images over the past week. Volcanic gas from Pagan may be noticed downwind of the volcano as a distinctive sulfurous odor. Additional information about volcanic gas and vog can be found on the web at this address: http://hvo.wr.usgs.gov/hazards/FAQ_SO2-Vog-Ash/main.html Access to the island may be restricted by the CNMI government. Contact the EMO for the latest information. Details...

Cleveland Daily Update issued Oct 30, 2014 12:40 Volcano Alert Level ADVISORY - Aviation Color Code YELLOW
No activity was observed in cloudy satellite and webcam images in the past 24 hours. Seismicity remains at low levels. Details...

Shishaldin Daily Update issued Oct 30, 2014 12:40 Volcano Alert Level WATCH - Aviation Color Code ORANGE
The ongoing low-level eruptive activity at Shishaldin Volcano continues. Strong periods of tremor continue to be recorded and overall seismicity remains elevated. Over the past 24 hours nothing unusual was observed in mostly cloudy satellite images. The webcamera view was mostly obscured by clouds except for a short period yesterday late afternoon when a clear image appears to show a small steam cap over the summit. Details...

Kilauea Daily Update issued Oct 30, 2014 09:35 Volcano Alert Level WARNING - Aviation Color Code ORANGE
Activity Summary: Kīlauea continues to erupt at its summit and within its East Rift Zone. Gas emissions have remained elevated. The June 27th lava flow in the East Rift Zone continues to advance, at variable rates, to the northeast through a residential area between Apaʻa St/Cemetery Rd and Pāhoa Village Road. As of 5:30 am this morning, the leading edge of the flow had advanced a distance of roughly 100 m (~110 yards) through the past 24 hours, with the flow remaining roughly 150 m (~167 yards) from Pahoa Village Road. Behind the flow front, there continue to be active ... Details...

Kilauea Status Report issued Oct 29, 2014 17:52 Volcano Alert Level WARNING - Aviation Color Code ORANGE
Scientists of the USGS Hawaiian Volcano Observatory conducted ground and aerial observations of the June 27th lava flow on Wednesday, October 29, 2014. The flow continued to move through private property today. The leading edge of the flow was advancing about 10 m (11 yd) per hour this afternoon, but has been variable in the past 24 hours. The flow moved downslope about 125 m (136 yd) since 5 pm yesterday. The flow width was less than about 50 meters (55 yards) at the leading edge. As of 4:15 pm, the flow was about 185 m (202 yd) in a straight line distance from Pāhoa Village Road and ... Details...


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