September 12 , 2017. EN. Sabancaya , Ruapehu , Sinabung , Telica .
September 12 , 2017.
Sabancaya , Peru :
An average of 38 explosions / day was recorded, slightly lower than the previous week. The predominance of events related to fluid movements (long-period type) and events related to ash emissions (Tremor type) is continuing. The earthquakes associated with the rise of magma (hybrid type) are low in number and in energy.
The eruptive columns of gas and ash increased slightly from the previous week, reaching a height of about 3500 m above the crater and dispersing over a radius of more than 40 km, mainly in a southeasterly direction .
During this period, the GPS station located to the southeast of the volcano showed a slight positive change in the vertical component.
The flow of volcanic gas (SO2) recorded a maximum of 1808 tons / day, considered moderate.
The MIROVA system recorded 5 thermal anomalies, with values between 2 MW and 16 MW of VRP (Irradiated Volcanic Energy).
In general, eruptive activity is maintained at moderate levels. No further changes are expected in the coming days.
Source : IGP.
Ruapehu , New Zealand :
Ruapehu Crater Lake (Te Wai-a-Moe): Lake temperature peaks at 43 °C marking end of heating cycle
Published: Tue Sep 12 2017 3:30 PM
The Crater Lake (Te Wai-a-Moe) at Mt Ruapehu occupies the active vent-crater. Recently the lake has been through a heating episode.
The lake reached a recent temperature high of 43 °C on 5 September marking the peak of the current heating cycle. For much of August the lake temperature rose at about 1 °C per day, starting from a low 23 °C, reaching the peak of 43 °C. Calculations indicate that around 600 MW of heat energy was needed to heat the lake, being about the same as the heat required to generate electricity from one of our geothermal power stations. The lake temperature is now 39 °C.
Ruapehu Crater Lake temperature data
The post 1995/1996 Crater Lake displays temperatures that typically range between about 16 and 38 °C. In early August, we reported on the variations in the lake temperature. The lake had cooled to a low of 19 °C at that time. GeoNet obtains temperatures from the lake using a data logger with a temperature sensor in the lake and communications via a satellite link. In the August story, we discussed the variations of the lake temperature. An analysis of the lake temperature data since 2009 when we installed a datalogger shows that for 5% of the time it is warmer than 38 °C and another 5% it is cooler than 16 °C. The median temperature is 24 °C.
Looking at the longer-term Crater Lake temperature data, collected from lake visits since 1950, the behaviour is similar.
The heating and cooling cycles are controlled by a mix of volcanic and geothermal processes. The results of the lake sampling in mid-August reflected the heating. Further sampling and visits to the Crater Lake are planned as the weather allows, being part of the standard GeoNet monitoring programme for Mt Ruapehu.
Source : Geonet
Sinabung , Indonésia:
Level IV level of activity (AWAS).
The Sinabung (2460 m altitude) since yesterday until this morning, is often covered with fog. The emission of the crater is observed, white, thick, with a low pressure up to 100 m above the peak. By recording of the seismograph, there were recorded 3 eruptions and a column of ash was observed rising up to 500-800m. It was recorded 36 hot avalanches and at a clear moment, they were observed slipping up to 50-1500 m towards the East-South-East. Dams in the Laborus River, formed by the accumulation of hot cloud deposits, can still cause lahars or floods if the dam collapses.
Communities / visitors should avoid activities within a radius of 3 km around the peak, and on a sectoral basis, from 7 km South-South-East, 6 km East-South-East and 4 km in the East-Northeast.
Given the upstream dam on the Laborus River, residents downstream of the Laborus River watershed must remain vigilant as this dam may collapse during heavy rains because it can not contain the volume of water causing lahars / floods downstream.
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA
Issued : 20170912/0132Z
Volcano : Sinabung (261080)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Sinabung Volcano Observatory
Notice Number : 2017SIN532
Volcano Location : N 03 deg 10 min 12 sec E 98 deg 23 min 31 sec
Area : North Sumatra, Indonesia
Summit Elevation : 7872 FT (2460 M)
Volcanic Activity Summary :
Eruption with ash clouds at 01:19 UTC ( 08:19 local time). The eruption lasted for 279 seconds.
Volcanic Cloud Height :
Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information : Ash cloud is moving to NNE
Seismic activity is characterized by the Deep Volcanic Earthquake, Low Frequency Earthquake, and Hybrid Earthquake. Rock avalanche (Incandescent lava) is not identified.
Source : VSI , Magma.
Photos : Endro Lewa ( Archives 2017)
Telica , Nicaragua :
The Ineter reports a volcanic earthquake related to low intensity activity on the Telica volcano.
The Nicaraguan Institute of Territorial Studies (INETER) reported that at 4:45 pm on Sunday, a volcanic earthquake occurred on the Telica, associated with low intensity activity due to gas flows (a normal process of active volcano).
No production of ash or volcanic material was recorded. The noise of the explosion was reported only by the inhabitants of the nearest vicinity of the volcano. INETER keeps a close eye on the Telica and will inform about the changes that have taken place, the institution said in its Sunday bulletin.
Source : Ineter
Photo : JM ( archives)