America’s Volcanoes

Current Long Valley status from LVO:

Only one earthquake was detected in the Long Valley area since the last update on February 20, 2008. The event, a magnitude, M=1.1, was located in the Sierra Nevada west of Mammoth Lakes near Devils Postpile National Monument

Current Stromboli status from INGV, translated via Google:

NOTIFIED OF 23/2/2008
(Update at 9:15 local time)
This information has analysis of seismic signals, carried out at the hall monitoring INGV section of Naples (Vesuvius Observatory), where the signals are centralized network a large seismic Banda who works on Stromboli.
I acquired data from 11 of the 13 stations that make up the network. The seismic activity recorded in last 24h submitted the following characteristics (GMT time):
• The analysis did not reveal sismogrammi seismic signals associated events landslides.
• The extent of the tremor is on a medium-low level.
• The counting of events Very Long Period (VLPs) gave a value of about 8.7 events per hour.
• The VLPs signal amplitude is low on values, with some event amplitude medium-low.
• The location of source signals VLPs through analysis indicates a semblance of Ipocentrale deep within the 400 m - 500 m asl
• The polarization parameters of seismic signal frequency in Banda VLPs not show substantial changes.
• The extent of the explosion-quakes is on the low values, with some amplitude mediobassa event.

Current Tungurauahua status from IG, translated via Google:

REPORT BY THE STATE OF VOLCANO TUNGURAHUA No. 053
Saturday, 23 2008
SUMMARY OF THE ACTIVITY OF THE VOLCANO
The tremor signal continued low recorded emissions have caused ash fall in mild Púela sectors and Palitahua.
ANNEX TECHNICAL AND COMMENTARY
Seismicity: We have counted a total of 10 events long period (LP), 9 episodes smaller tremors emission.
Ash, wind, broadcasts: The volcano from the afternoon and evening yesterday has remained cloudy, and this morning ash fall was reported in the sectors of Palitahua and Púela, at noon today the sector of the volcano was partially cleared and saw a column of emission approximately 1 km. Ash content with mild to address the South West.
Rain and lahars: No rains were reported.
Sounds and observations: There were heard bramidos.

Current Anatahan status from HVO-CNMI:

Anatahan Daily Update issued Feb 21, 2008 11:07 MPT Volcanic-Alert Level WATCH - Aviation Color Code ORANGE
Report prepared by the U.S. Geological Survey. Seismicity at Anatahan remains elevated. Satellite data show continued production of sulfur dioxide by the volcano. During times of northerly winds, a plume from Anatahan would extend south towards and possibly over the CNMI and Guam. The Emergency Management Office (EMO) of the CNMI government will issue appropriate advisories should ash or vog be produced by Anatahan. Access to the island may be restricted by the CNMI government. Please contact the EMO to get the latest information. USGS contact information: duty scientist (808) 967-8815 http://volcano.wr.usgs.gov/cnmistatus.php

Current Kilauea status from HVO:

Kilauea Daily Update issued Feb 21, 2008 09:32 HST Volcanic-Alert Level WATCH - Aviation Color Code ORANGE
This report, in addition to maps, photos, and webcam images (available using the menu bar above), prepared by the Hawaiian Volcano Observatory (HVO):

Activity Summary for last 24 hours: A narrow, slow-moving pahoehoe lava flow entered the upper reaches of Royal Gardens subdivision yesterday. Seismic tremor levels and sulfur dioxide emission rates were elevated to several times background levels at Kilauea summit.

Hazard Summary: Three hazardous conditions exist currently on Kilauea volcano - potentially harmful sulfur dioxide concentrations at the summit, dangerous conditions around the Pu`u `O`o/July 21/November 21 vent area, and lava flow threat to the Royal Gardens subdivision.

The current increase in sulfur dioxide emission rates at the summit means that SO2 concentrations are likely to be at hazardous levels for visitor areas downwind of Halema`uma`u, especially during weak wind conditions or winds from the south. Most people are sensitive to sulfur dioxide at these levels. Children and individuals with asthma, chronic obstructive pulmonary disease (COPD), or other breathing problems should avoid areas in the south caldera: southwest rift zone, south caldera pullout, and the Halema`uma`u overlook parking lot. Stay informed about SO2 concentrations in continuously monitored areas (Jaggar Museum and Kilauea Visitor\’s Center). The National Park Service has closed all pullouts and parking areas in the south caldera (http://www.nps.gov/havo/closed_areas.htm).

Vent areas and lava channels are hazardous and conditions can change rapidly. Lava flows advancing through vegetation are hazardous and can produce fire and methane explosions that propel chunks of lava and rock several feet into the air. Sulfur dioxide emissions from Pu`u `O`o are very high and result in hazardous concentrations downwind. Access to the 7/21 eruption site in the Kahauale`a Natural Area Reserve is closed (see http://www.state.hi.us/dlnr/chair/pio/HtmlNR/07-N076.htm). Wao Kele o Puna is also closed.

There continues to be a threat from lava flows to residents of Royal Gardens subdivision. As long as lava flows are active south of fissure D, the subdivision is within likely downslope flow paths. The rootless shields, which are now less than two miles from the subdivision, can collapse and release lava flows that advance that distance within a few days. Hawai`i County Civil Defense has been notified and is taking appropriate measures (www.lavainfo.us).

Last 24 hours at 7/21 eruption site: An overflight yesterday afternoon observed a narrow, relatively slow-moving pahoehoe flow active in the upper reaches of Royal Gardens subdivision. The flow was 250 meters (yards) south of the northern boundary of the subdivision at 1:30pm yesterday, above Royal Avenue. Another small flow extended eastward from the rootless shields toward Kalalua. An overflight is planned for tomorrow morning.

Last 24 hours at Pu`u `O`o: Once again, diffuse incandescence was observed through fume in the crater overnight. The Pu`u `O`o tiltmeter recorded no significant change. GPS receivers continued to record contraction across the cone.

Last 24 hours at Kilauea summit: The summit tiltmeter network recorded no significant changes. GPS receivers across the caldera have not recorded significant long-term change (no contraction or extension) since early February. Seismic tremor levels were at low-to-moderate values, which is several times background level. Two small earthquakes occurred on the south flank, and two small events were located north of Kilauea summit.

Sulfur dioxide concentrations peaked at 3000 ppb (3 ppm) yesterday afternoon and 2000 ppb (2 ppm) last night at Jaggar Museum.

Sulfur dioxide (SO2) emission rates from the summit area have been elevated at 2-4 times background values since early January. The emission rate was about 570 tonnes/day last Thursday, compared to a background rate of between 150-200 tonnes/day. SO2 concentrations exceed 1 ppm in areas downwind of Halema`uma`u crater (almost half of Crater Rim Drive between Halema`uma`u parking lot and the southwest rift zone). SO2 concentrations exceed 10 ppm for a short portion of the road between the Halema`uma`u parking lot and the south caldera pullout.

Current Cleveland status from AVO:

Thursday, February 21, 2008 11:19 AM AKST (20:19 UTC)

CLEVELAND VOLCANO (CAVW #1101-24-)
52°49′20″ N 169°56′42″ W, Summit Elevation 5676 ft (1730 m)
Current Aviation Color Code: YELLOW
Current Volcano Alert Level: ADVISORY

Clouds obscured satellite views of Cleveland last night. No reports of activity have been received.

AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information

CVO has lowered the status of Mount St. Helens and only issue updates on Fridays now:

MOUNT ST. HELENS UPDATE
Current Volcanic- Alert Level Advisory; Aviation Color Code Yellow: Growth of the new lava dome inside the crater of Mount St. Helens, which began in October 2004, appears to have paused during the past month. Therefore, we are lowering the alert level from Watch to Advisory and the aviation color code from Orange to Yellow, which signifies that volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase. The rate of lava extrusion as determined by repeated aerial photography has been declining since late 2004, and other indicators of eruptive activity have also declined significantly. Comparison of photographs taken by remote cameras between late January and mid-February 2008 shows no evidence of extrusion. In addition, very few earthquakes have been recorded since late January, gas emissions are barely detectable, and daily ground-tilt events have stopped. These changes may only reflect a temporary pause in the eruption. The new lava dome remains hot in places and capable of producing hot avalanches or small steam explosions that could cause hazardous conditions in and around the crater. Sudden melting of snow and ice or intense rainfall could send small lahars onto the Pumice Plain and perhaps down the Toutle River as far as the Sediment Retention Structure (SRS). Ash clouds from explosions could affect aircraft. Until conditions warrant a change, Cascades Volcano Observatory will issue weekly updates on Fridays, rather than our current daily updates.

Current Long Valley status from LVO:

Long Valley Caldera Daily Update issued Feb 21, 2008 10:54 PST Volcanic-Alert Level NORMAL - Aviation Color Code GREEN
Only one earthquake was detected in the Long Valley caldera area since the last update on February 20, 2008. The event, a magnitude, M=1.1, was located in the Sierra Nevada south of the caldera.

Current Colima status from UCOL, translated via Google:

Colima, Col.. To February 21, 2008.
Report of the recent volcanic activity
(Report: 12:00 pm)

The State Government through the State Civil Protection Unit Colima, reports that in the last twenty-four hours, the staff responsible for monitoring the behavior of Colima Volcano of Fire detected only a fumarole, which has not led to any reports on damage or involvement in the surrounding populations.

However, it is necessary to remind people that avoids remaining in the surrounding canyons at the possibility of lahars (mudflows), because at this time of year is still possible the emergence of cold fronts that cause the settlement of clouds, Light rain and thunderstorms spot at the top of the volcano.

Moreover, maintaining the restriction on overflights that have no scientific purposes or civil protection, and prohibited retention of people outside these activities in the ravines of the volcano.

According to monitoring by the morning Thursday, at 09:14 pm and envisioned a fumarole gray which rose to 500 meters high above the volcanic dome, with an easterly direction.

The information was provided by the State Civil Protection Unit Jalisco, with whom the Government of the State of Colima remains constant communication with regard to the activity of the volcano in real time, in order to respond to whatever opportunity and ensure the safety of population, as is the interest of the governor Jesus Silverio Cavazos Ceballos.

In addition, it works in prevention programs to keep the citizens informed on the evolution of the volcanic activity, and avoid generating alarm about rumors.

There is constant communication with the community brigade that has been formed with residents of the village of La Becerrera, who have been trained in self-protection to natural disasters. It also maintains permanent contact with the staff of the departure of the military Yerbabuena, The Becerrera, The Boar ranch, as well as elements of Public Security of the State, Comala and Civil Protection Cuauhtémoc.

The recommendations set forth for months are still alive, or who are living in a risk area, they must meet the indications that this body passed through the media, it must be emphasized that the exclusion zone of activities for the states of Jalisco and Colima is 7.5 kilometres from the summit of the volcano on the channels of the gullies. The radius of preventive alert remains at 11.5 miles from the top of the volcano, which includes the towns of La Yerbabuena, and Becerrera in the state of Colima, and Causentla, Confraternity of Tonila, Atenguillo, El Saucillo, El Fresnal, The Funnel Juan Barragan, Los Machos, Agostadero and El Borbollón in Jalisco.

Should be avoided stay in the gullies The Lumbre, Cordobán, San Antonio and Monte Grande, in Colima, and El Muerto, La Tuna, Santa Ana, El Cafecito, The Arena and Beltran-peach in Jalisco.

* Note: Please see the daily information from the volcanic activity at the following Internet address http://www.colima-estado.gob.mx/2006/seguridad/indvolcan.php

Colima, Col. 21 2008

Current Stromboli status from INGV, translated via Google:

NOTIFIED OF 21/2/2008
(Updated at 12:30 local time)
This information has analysis of seismic signals, carried out at the hall monitoring INGV section of Naples (Vesuvius Observatory), where the signals are centralized network a large seismic Banda who works on Stromboli.
I acquired data from 12 of the 13 stations that make up the network. The seismic activity recorded in last 24h submitted the following characteristics (GMT time):
• The analysis did not reveal sismogrammi seismic signals associated events landslides.
• The extent of the tremor is on a medium-low level with a rising trend.
• The counting of events Very Long Period (VLPs) gave a value of about 11 events per hour.
• The VLPs signal amplitude is low on values.
• The location of source signals VLPs through analysis indicates a semblance of
Ipocentrale deep within the 400 m - 500 m asl
• The polarization parameters of seismic signal frequency in Banda VLPs not show substantial changes.
• The extent of the explosion-quakes is on the low values, with some amplitude event mediobassa