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Posts Tagged ‘Shinmoedake’

FEWW Volcano Watch – 101301

Posted by feww on October 13, 2017

Shinmoedake volcano continues to erupt in Kyushu, Japan

The volcano’s latest round of activity began on October 11, after six years of dormancy. The volcano had previously erupted on September 7, 2011.

Shinmoedake on Kirishima mountain [Kirishimayama] on the island of Kyushu, Japan continues to eject plumes of smoke and ash to a height of about 1.7 km above the crater.

Ash fall was confirmed in four nearby cities and towns in Miyazaki prefecture after Thursday’s eruption.

Shinmoedake eruption on Oct 12, 2017 send a plume of whit smoke and ash to a height of about 1.7 km above the crater. Image: JMA/via Kyodo.

Japan Meteorological Agency has raised the eruption warning level from 2 to 3 ( on a scale of 1-5) after detecting inflation, which they have interpreted as increased probability of larger eruptions with pyroclastic flows occurring within the 2-kilomter radius from the crater.

Ongoing Activity at Sakurajima (Aira Caldera)

About two dozen events have been detected at Mt Sakurajima’s Showa Crater starting October 2. At least three of the events were explosive, exhaling plumes to heights of bout 1.6 km above the crater. An explosion ejected pyroclasts as far as 800m on October 5. Alert level remains at 3.

New Volcanic Activity (Global)

New volcanic activity have been reported at two volcanoes in Indonesia and one in Vanuatu:

  • Aoba (Ambae Island, Vanuatu)  Ash plumes rose to a height of 3.7 km a.s.l. on Oct 10. State of Emergency on the island has been extended for two weeks, through Oct 24. Some 11,000 residents were evacuated last month.

Indonesia

  • Mt. Agung (Bali)  An increase in seismic activity around the volcano forced the authorities to evacuate  about 124,000 people who lived around the volcano. The Indonesian National Board for Disaster Management declared a 12-kilometer exclusion zone around the volcano on September 24 after hundreds of volcanic earthquake rattled the volcano.
  • Lewotolo (Lomblen Island)  Around 800 people living near the volcano have been evacuated amid new activity. PVMBG has raised the alert level from 1 to 2 (on a scale of 1-4)

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Mount St. Helens: “The Ides of March?”

Posted by feww on February 17, 2011

VolcanoWatch Weekly [17 Feb 2011]

Shinmoedake Update:

Some 2,500 people living near Shinmoedake volcano on Japan’s Kyushu island were advised earlier today to evacuate their homes after heavy rain threatened lahar avalanches, reports say.

VoW: Mount St. Helens


Mount St. Helens and Spirit Lake, as seen from Bear Cove. Image Source: U.S. Forest Service via USGS/CVO.


Phreatic eruption of Mount St. Helens, March 28, 1980, as seen from the north. Image by C.Dan Miller, USGS/CVO

Mount St. Helens, Washington  Ash Plume Path May 18, 1980


Click image to enlarge.

Mount St. Helens Volcano
Position: 46°12′ N 122°10’48” W,
Summit Elevation: 2,549 m (8,363 ft )
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Source: USGS/CVO

Recent observations:

An M4.3 earthquake struck the Mount St. Helens region this morning, 14 February 2011, at 10:35 a.m. PST (18:35 UTC) and was felt widely through southwestern Washington and Northwestern Oregon (http://earthquake.usgs.gov/earthquakes/dyfi/events/uw/02141835/us/index.html). Its exact magnitude may change by a few tenths from this value as records are further analyzed. The earthquake was followed by several aftershocks up to M2.8 over the next few hours (http://www.pnsn.org/recenteqs/latest.htm), the three largest of which were also reported felt. All of the earthquakes are located in an area about 8 kilometers (5 miles) north of the crater of Mount St. Helens, near the Johnston Ridge Observatory, at a depth of about 4 to 6 kilometers (2.5 to 4 miles).

Today’s earthquakes are in the same place as a small swarm that took place about two weeks earlier, on 29 January. These earthquakes are reminiscent of a swarm that took place about 30 years ago, when a swarm of small earthquakes began in August 1980, a few miles northwest of today’s activity. The 1980-1981 sequence climaxed with an M5.5 earthquake on 14 February 1981. Analysis of the 1981 events suggested that they occurred along existing faults in the Mount St. Helens seismic zone, a northwest to southeast trending system of faults in which Mount St. Helens lies. The Mount St. Helens seismic zone exhibits strike-slip motion, with the southwestern rocks slipping horizontally northwest relative to the rocks northeast of the fault zone. The fault zone likely exerts control on the location of Mount St. Helens volcano. Studies following the 1980 eruption suggested that the magma removed during the May 1980 eruption and subsequent lava-dome building caused faults along the seismic zone to slip in response to the magma withdrawal. Similar interaction of volcanic activity and tectonic fault movement is possible in the case of today’s earthquakes, but at present there appears to be no signs of unrest in the volcanic system.  USGS/Cascades Volcano Observatory, Vancouver, Washington

Summary of Weekly Volcanic Activity Report – 9 February to 15 February 2011

[Source: SI/USGS]

New Activity/Unrest:

Map of Volcanoes


Map of Volcanoes.
Background Map: University of Michigan. Designed and enhanced by Fire Earth Blog. Click image to enlarge.

Ongoing Activity:

For additional information, see source.

Related Links:

FEWW Volcanic Activity Forecast

Other Related Links:

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