September 14 , 2017. EN. Kilauea , Poas , Turrialba , Kanlaon , Solfatara di Pozzuoli .
September 14 , 2017.
Kilauea , Hawai :
Multiple Rockfalls Recorded At Kilauea Volcano Lava Lake .
12 SEPTEMBER 2017. Several small to medium-sized rockfalls were recorded at the Kilauea volcano summit lava lake in recent days. Much of the large ledge that had built up on the south side of the summit vent within Halema‘uma‘u fell into the lava lake on September 8.
That day, USGS Hawaiian Volcano Observatory scientists say rockfalls happened at 11:06 a.m., 12:16 p.m., 3:12 p.m., 6:06 p.m. and 6:12 p.m. HST, and another occurred at 5:10 a.m. HST on Sept. 9. Such rockfalls are common during significant drops in the lava lake level, scientists say, because support is removed from the crater walls.Effondrements multiples enregistrés sur le lac de lave du volcan Kilauea .
On September 8, at 6:06 p.m. HST, much of the large ledge that had built up on the south side of the summit vent within Halema‘uma‘u collapsed. The top two images, captured by HVO’s K2 and HT web cameras, show the summit vent before the collapse. A yellow arrow points to the ledge, which was formed by layers of lava stacking up during repeated high lake levels. The lower webcam images were captured minutes after the collapse. In the thermal images, note the difference in the lava lake surface before and after the collapse. K2cam shows the view from HVO and Jaggar Museum; HTcam is a thermal camera that looks down on the lava lake from the rim of Halema‘uma‘u.
HVO K2cam image at the time of the 6:06 p.m. collapse on Sept. 8. Interestingly, this collapse did not generate a large explosion—only a small, brownish plume was observed during and immediately after the rocky ledge fell into the lava lake. The next day, HVO geologists noted a dusting of ash on the Halema‘uma‘u crater rim, but found no spatter fragments like those that have been hurled to the crater rim during past large explosions. At the time of the Sept. 8 collapse, the lava lake level was about 53.5 m (176 ft) below the vent rim, too deep to be visible from HVO. Collapses are more common when the lava lake level drops significantly, because support is removed from the crater walls.
Source : HVO , BIG ISLAND VIDEO NEWS.
Poas , Turrialba , Costa Rica :
Daily volcano activity report, 13/09/17, Updated at 11:00 p.m.
Ash emissions have been detected in the past 24 hours. Today, at 7:34, a new ash emission has begun, which is still in progress, at the time of writing this report. The seismic activity is similar to that of the previous day. At the time of reporting, the dispersal of the plume is mainly west-southwest. An odor of sulfur is reported in Tibás and Coronado.
The Poás Sept. 12, 2017. Seen from the northern edge of the crater. Photo: Maria Martinez OVSICORI-UNA. The fumaroles on the dried bottom of the ancient lake of the crater are about 500 meters from the spectator.
In the last few hours, an ash emission was detected on the volcano. The seismic activity is similar to that of the previous day. At the time of reporting, the plume dispersal is mainly south, but the winds are variable and can spread the ash plume to several areas.
The OVSICORI-UNA remains vigilant on seismic and volcanic activity.
Source : Ovsicori
Kanlaon , Philippines :
Activity bulletin, September 14 2017 08:00 A.M.
Kanlaon Volcano’s seismic monitoring network recorded seven (7) volcanic earthquakes during the past 24 hours. Degassing at the active vents could not be observed due to thick clouds covering the summit. Ground deformation data from continuous GPS measurements indicate inflation of the edifice since December 2015. Sulfur dioxide (SO2) emission was measured at an average of 1 tonne per day on September 6, 2017.
Alert Level 1 status prevails over Kanlaon Volcano, which means that it is at an abnormal condition and has entered a period of unrest. The local government units and the public are strictly reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to possibilities of sudden and hazardous steam-driven or phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ejecta from any sudden phreatic eruption can be hazardous to aircraft. DOST-PHIVOLCS is closely monitoring Kanlaon Volcano’s activity and any new development will be relayed to all concerned.
Source : Phivolcs
Solfatara di Pozzuoli , Italy :
The invisible danger of volcanoes: gaseous emanations:
An 11-year-old boy and his parents died Tuesday in a volcanic area of Solfatara di Pozzuoli near Naples in southern Italy.
According to the authorities, the boy entered a forbidden area around 11 am, local time, when he apparently fainted due to the toxic gases that had escaped from the ground and fell into a small crater.
His parents, aged 42 and 45, tried to rescue him, but the crater collapsed and they also fell inside. Their bodies were recovered from the bottom of a three-meter hole by the firefighters, who said the deaths had occurred by asphyxiation.
Source : Avcan
Photo : ANSA/EPA-