January 21 , 2018. EN. Mayon , Kilauea , Turrialba , Poas , Pacaya .

Home / blog georges Vitton / January 21 , 2018. EN. Mayon , Kilauea , Turrialba , Poas , Pacaya .

January 21 , 2018. EN. Mayon , Kilauea , Turrialba , Poas , Pacaya .

January 21 , 2018.


Mayon , Philippines :

MAYON VOLCANO BULLETIN 21 January 2018 8:00 A.M.

Quiet lava effusion from the new summit lava dome and lava collapse events characterized Mayon Volcano’s eruptive activity in the past 24 hours. Fourteen (14) rockfall events and ten (10) pyroclastic density currents or PDCs were recorded by Mayon’s seismic monitoring network. Rockfall events were generated by the collapsing lava front and margins of the advancing lava flow on the Miisi Gully and by shedding from the summit dome onto the Bonga Gully. Currently, the Miisi lava flow has advanced to three (3) kilometers from the summit crater well within the Permanent Danger Zone (PDZ). Weak ash clouds were lofted from the rockfall events as well as from the persistent disintegration of lava on the advancing front of the Miisi lava flow before drifting to the southwest. During night time, crater glow with incandescent rock flow along Miisi gully was observed. Sulfur dioxide gas emission was measured at an average of 954 tonnes/day on January 20, 2018. Electronic tilt measurements indicate a sustained swelling or inflation of the edifice since November 2017, consistent with pressurization by magmatic intrusion.

Alert Level 3 remains in effect over Mayon Volcano, which means that it is currently still in a relatively high level of unrest and hazardous eruption is still possible within weeks or even days. The public is strongly advised to be vigilant and desist from entering the six (6) kilometer-radius Permanent Danger Zone (PDZ) and the 7-km Extended Danger Zone (EDZ) on the southern flanks due to the danger of rockfalls, landslides and sudden explosions or dome collapse that may generate hazardous volcanic flows. Increased vigilance against pyroclastic density currents, lahars and sediment-laden streamflows along channels draining the edifice is also advised. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft. Based on the seasonal wind pattern, ash fall events may most likely occur on the southwest side of the volcano.

DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

Source : Phivolcs


Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
No significant change. Kīlauea continues to erupt at its summit and from the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow is producing scattered surface flow activity and lava is not entering the ocean. Lava flows pose no threat to nearby communities at this time. Friday morning, a rockfall into the lava lake at Kīlauea’s summit produced an explosion of debris that blanketed an area around the southeast rim of Halemaʻumaʻu crater. Prior to the explosion, the lava lake was 39 m (128 ft) below the floor of Halemaʻumaʻu crater and it has changed little overnight.

Summit Observations:
Summit tiltmeters continue to record deflationary tilt. Early Friday morning, a rockfall from the wall of Halemaʻumaʻu crater plunged into the lava lake producing a short-lived explosion of spatter and wallrock that blanketed an area around the former visitor overlook. Debris fell as far as the Halemaʻumaʻu parking lot. Before the rockfall, the lava lake was 39 m (128 ft) below the floor of Halemaʻumaʻu crater and the level has changed little overnight. Sulfur dioxide emission rates remain high. Seismicity is at normal levels, with tremor fluctuations related to the vigor of lava lake spattering.

Puʻu ʻŌʻō Observations:
Tiltmeters at Puʻu ʻŌʻō recorded no significant change during the past day. The sulfur dioxide emission rate from the East Rift Zone vents remains significantly lower than the summit emission rate.

Lava Flow Observations:
The episode 61g flow is still active, but no lava is flowing into the ocean. Surface lava flow activity continues on the upper portion of the flow field near Puʻu ʻŌʻō , on the pali, and in scattered areas along the coastal plain. These lava flows pose no threat to nearby communities at this time.

Source : HVO

Photos : Bruce Omori , HVO


Turrialba , Poas , Costa Rica :

Daily Turrialba and Poás Volcano State Report: 19 January 2018, updated at 11:00.

Turrialba Volcano: activity over the past 24 hours
Seismic activity over the last 24 hours is low, with sporadic LP-type earthquakes, low amplitude, and short periods of low amplitude tremors (for example, from 08:00 to 09:15 local time). These volcanic events are associated with the movement of fluids (water, gas and / or magma) under the volcanic building. The nebulosity in the area does not allow for direct observation of the volcano, but these signals indicate degassing, as has been observed in previous days.

On the afternoon of 18 January, at approximately 18:00 local time, a large increase in SO2 gas was detected at Coronado Station, associated with Turrialba emissions. There has been no report of perception of sulfur odor by the public.
At the time of this report, winds at the summit of the volcano are mainly directed to the southwest.

Volcano Poás: activity in the last 24 hours
The level of seismic activity is very low. In general, the seismic signals recorded on the Poas are generated by the background noise produced by external factors.
No ash emission was detected. The nebulosity in the area does not allow direct observation of the volcano.
At the time of this report, winds at the summit of the volcano are mainly directed to the southwest.

Due to the constant rains of recent days, as well as the closing of the degassing pipes, the lagoon in the crater of the Poás volcano has been reformed again.

Source : Ovsicori


Pacaya , Guatemala :

SPECIAL BEPAC VULCANOLOGICAL BULLETIN # 003-2018, Guatemala 20 JANUARY 2018, 07:35 hours (local time) Lava flow on the PACAYA volcano.

Type of activity: Strombolienne.
Morphology: Composite stratovolcan
Location: 14 ° 22’50˝ Latitude N; 90 ° 36’00 Longitude W.
Altitude: 2,552msnm.

The activity of the Pacaya volcano persists, with weak Strombolian explosions. This activity permanently builds and destroys a portion of the slag cone inside the Mackenney crater
For 3 hours today is reported by the Pacaya Volcano Observatory (OVPAC) a lava flow 400 meters long that descends from the crater to the west, in the collapse zone, causing landslides in front of the flow.
This activity is normal within a Strombolian volcano such as Pacaya, and seismic and visual surveillance is maintained due to any sudden change in activity.

For the above, INSIVUMEH recommends:
At SE-CONRED: Be aware of Pacaya volcano activity, due to any change of activity.
To the CIVIL AVIATION DIRECTORATE: Stay on the activity.
AT PACAYA NATIONAL PARK; Maintain the ban on climbing the crater, for guides and tourists, as this can generate explosions with projections around the Mackenney crater that can cause serious damage.

Source : Insivumeh .



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