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Sakura-jima (Japan) – Report for 9 May-15 May 2012

Posted on May 19, 2012 by admin

JMA reported that during 11-15 May explosive eruptions from Sakura-jima’s Showa Crater occurred nine times and ejected tephra as far as 1.3 km from the crater. Based on information from JMA, the Tokyo VAAC reported that during 9 and 11-15 May explosions produced plumes that rose to altitudes of 1.8-2.7 km (6,000-9,000 ft) a.s.l. and drifted SW, S, SE, E, and N. A pilot observed an ash plume on 12 May that rose to an altitude of 2.1 (7,000 ft) a.s.l. and drifted E.

Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)

Smithsonian / USGS Weekly Volcanic Activity Report

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Pagan (United States) – Report for 9 May-15 May 2012

Posted on May 19, 2012 by admin

According to NASA’s Earth Observatory, a satellite image of Pagan acquired on 7 May showed a gas-and-steam plume drifting W. The plume’s blue tint suggested the presence of sulfur dioxide; elevated levels of sulfur dioxide to the W of the volcano were detected in satellite images later that day. The USGS reported that minor steam-and-gas plumes were observed in partly cloudy satellite images during 4-11 May. The Volcano Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.

Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and the United States Geological Survey Volcano Hazards Program, NASA Earth Observatory

Smithsonian / USGS Weekly Volcanic Activity Report

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Iliamna Weekly Update issued May 18, 2012 12:37 AKDT Volcano Alert Level ADVISORY – Aviation Color Code YELLOW

Posted on May 19, 2012 by admin

Seismic activity at Iliamna Volcano has been slightly above background throughout the past week. Nothing unusual was observed in mostly clear web camera and satellite images during the past week. AVO has received no reports of unusual activity at the volcano.

The current level of activity at Iliamna does not indicate an imminent or certain eruption and seismic activity appears to be declining gradually. A similar seismic swarm occurred at Iliamna Volcano in 1996-1997 and was not followed by eruptive activity. Prior to an eruption, AVO would expect to see a significant increase in …
Recent Volcano Observatory Activity Reports

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Cascade Range Weekly Update issued May 18, 2012 15:00 PDT Volcano Alert Level NORMAL – Aviation Color Code GREEN

Posted on May 18, 2012 by admin

Activity Update: All volcanoes in the Cascade Range are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry Volcano, and Crater Lake, in Oregon.

Recent Observations: Siesmic activity of Cascade Range volcanoes remained at background levels throughout the week. Three shallow, magnitude 0.9-1.0 earthquakes occurred ~20 km NW of Newberry Volcano early on the morning of May 18.

The U.S. Geological Survey Cascades Volcano Observatory …
Recent Volcano Observatory Activity Reports

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Cleveland Weekly Update issued May 18, 2012 12:37 AKDT Volcano Alert Level WATCH – Aviation Color Code ORANGE

Posted on May 18, 2012 by admin

Nothing unusual was observed in satellite data of Cleveland Volcano over the past week. No ash emissions or other outward signs of unrest were detected or reported during the week.

While Cleveland Volcano is active, sudden ash-producing explosions may occur at any time. Ash clouds associated with explosive events could extend to more than 20,000 feet above sea level. If a large ash-producing eruption occurs, seismic, infrasound, or volcanic lightning networks should detect the event and alert AVO staff. There is no real-time seismic monitoring network on Cleveland Volcano so AVO is …
Recent Volcano Observatory Activity Reports

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Kilauea (United States) – Report for 9 May-15 May 2012

Posted on May 18, 2012 by admin

During 9-15 May HVO reported that the circulating lava lake periodically rose and fell in the deep pit within Kilauea’s Halema’uma’u Crater. On 14 May laser measurements indicated that the lava-lake surface was about 67 m below the Halema’uma’u Crater floor. Almost daily measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash, and occasionally fresh spatter from an active source at the SE edge of the lava lake, onto nearby areas. Incandescence was visible from both a lava pond in a small pit on the E edge and a small spatter cone on the SE edge of the Pu’u ‘O’o crater floor, and from two skylights on the uppermost part of the lava-tube system. Geologists observed slowly advancing lava flows on 13 May that were about 1.4 km from the coast. A short lava flow issued from an incandescent vent on the S part of Pu’u ‘O’o's crater floor.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Smithsonian / USGS Weekly Volcanic Activity Report

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Kilauea Daily Update issued May 18, 2012 07:08 HST Volcano Alert Level WATCH – Aviation Color Code ORANGE

Posted on May 18, 2012 by admin

Summit inflation continued; lava was generally at high levels in both summit and rift vents. At Pu`u `O`o, glow persisted from the usual sources and lava was visible in the eastern collapse pit; to the southeast, surface flows from new breakouts advanced but had not reached the ocean. Seismic tremor levels were generally low; gas emissions were elevated.

The summit tiltmeters showed that gradual inflation at the summit has persisted since the last DI event two days ago. The lava lake at Halema`uma`u remains …
Recent Volcano Observatory Activity Reports

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Karymsky (Russia) – Report for 9 May-15 May 2012

Posted on May 18, 2012 by admin

KVERT reported that moderate seismic activity from Karymsky continued to be detected during 4-11 May, and indicated that possible ash plumes rose to an altitude of 2 km (6,600 ft) a.s.l. during 7-8 May. Satellite imagery showed a daily thermal anomaly on the volcano. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Smithsonian / USGS Weekly Volcanic Activity Report

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Cleveland (United States) – Report for 9 May-15 May 2012

Posted on May 18, 2012 by admin

AVO reported that during 9-12 and 15 May cloudy weather conditions prevented satellite observations of Cleveland’s summit crater. Elevated surface temperatures were detected in images on 13 May and possibly the next day. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange.

Source: Alaska Volcano Observatory (AVO)

Smithsonian / USGS Weekly Volcanic Activity Report

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Sirung (Indonesia) – Report for 9 May-15 May 2012 – NEW

Posted on May 18, 2012 by admin

CVGHM reported that on 8 May a three-hour long ash eruption from Sirung was accompanied by loud sounds and incandescence that reached 10 m above the crater. An ash plume rose 3.5 km above the crater and drifted N, producing ashfall up to 4 mm thick near the crater. During 9-12 May white plumes rose 30-50 m above the crater. A sulfur odor was reported in areas up to 3 km away on 12 May. That same day CVGHM raised the Alert Level to 3 (on a scale of 1-4) and recommended that visitors not approach the volcano within a 2.5 km radius. Based on a report from a ground-based observer and analyses of satellite imagery, the Darwin VAAC noted that on 12 May an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted about 95 km SW.

Sources: Center of Volcanology and Geological Hazard Mitigation (CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)

Smithsonian / USGS Weekly Volcanic Activity Report

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