July 20 , 2017. EN . Piton de la Fournaise , Misti , Sanbancaya , Nevado del Ruiz , Yellowstone .

Home / blog georges Vitton / July 20 , 2017. EN . Piton de la Fournaise , Misti , Sanbancaya , Nevado del Ruiz , Yellowstone .

July 20 , 2017. EN . Piton de la Fournaise , Misti , Sanbancaya , Nevado del Ruiz , Yellowstone .

July 20 , 2017.


Piton de la Fournaise , La Réunion :

Activity Report for Wednesday, July 19, 2017 at 4:30 pm (Local Time)

The eruption begun on July 14 at 00:50 local time continues. The intensity of the volcanic tremor (indicator of surface eruptive intensity) has been relatively constant for 36 hours, with an intensity equivalent to that observed on the second day of the eruption (Figure 1).


Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 15h00 (11h00 UTC) on July 19th on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)

The eruptive cone forming downstream of the eruptive crack continues its edification (Figure 2). At 11.30 am (local time), the cone always had an opening towards the east, with two main points of activity in its interior.


L’image contient peut-être : montagne, ciel, plein air et nature

The overflows of lava and flows from these two points merged in a single channel at the level of the opening of the cone.

The projections of lava did not exceed the average height of 20 meters.


Figure 2 : Prise de vue sur le site éruptif le 19 Juillet 2017, 11h25 (heure locale). (© OVPF/IPGP)

Une troisième bouche active est en train de former un petit cône sur la bordure intérieure Nord du cône principal (à droite sur la Figure 3).

Figure 3: Shooting at the eruptive site on July 19, 2017, 11:27 (local time). (© OVPF / IPGP)

– No earthquakes have been recorded this day.
– A slight deflation (deflation) is always observed at the top of the terminal cone.



Estimates carried out by satellite methods via the HOTVOLC platform (OPGC – Clermont Ferrand) show flow rates between 1 and 3 m3 / s.

Source : OVPF

Photos : Fournaise info , David Chane See Chu .


Misti , Peru :

Sismo – volcanic monitoring:

The seismic activity of the Misti volcano remains at low levels.

LF – complex seismicity (double events related to fluid pressure fracturing processes) showed a slight increase in the last period, after an average of two events per day and a maximum activity observed on the last July 09 with 13 earthquakes. The energy of the LF – complex seismicity remains at low values.
Volcano-tectonic events (VT), associated with rock fracturing, recorded a decrease in their daily occurrence from 53 events per day in the period before 27 earthquakes / day during this fortnight. In the same vein, the energy of the VT events remains at low values.


Satellite Surveillance:
Thermal anomalies: The Mirova system (www.mirova.unito.it) of the University of Turin (Italy) has not detected thermal anomalies on the Misti volcano for this period (VPR = 0 Megawatts).
SO2 Anomalies: The GSDM-NASA (EOS Aura) satellite system (http://so2.gsfc.nasa.gov/) did not detect significant anomalies of SO2 (magma gas) density for the Misti volcano .


Misti volcanic activity remains low.
LF-complex events showed a slight increase during this period, after recording an average of two events per day. Seismicity of type VT, on the other hand, showed a decrease in activity with an average of 27 events per day, 50% less than in the previous period.
No thermal anomalies or high SO2 gas density values ​​were detected on the Misti volcano.

Any changes will be reported in a timely manner.


Source : IGP

Photo : Nicole Beuchat


Sabancaya , Peru :

Alert of ash falls for the volcano Sabancaya.

Type of event: Explosions.
Direction of ash dispersal: North direction.
Altitude: 4000m above the crater.
Dispersion distance: about 40 km
Areas affected by dispersal: Cabanaconde, Pinchollo, Lari, Madrigal, Ichupampa, Maca, Achoma.
Date: July 19, 2017.
Time: 09h31.


The dispersal prognosis indicates that the ash emitted by the Sabancaya volcano will spread northwards on Cabanaconde, Pinchollo, Lari, Madrigal, Ichupampa, Maca, Achoma.

The dispersal of ash can cause problems and affect the health of people living nearby. For this, we recommend:
-Protect yourself by using eye protection glasses and respiratory masks


Source : IGP


Nevado Del Ruiz , Colombia :

Weekly activity bulletin of the volcano Nevado del Ruiz, from July 11 to July 17, 2017.
The level of activity continues: at the level of yellow (III) activity: changes in the behavior of volcanic activity.

As regards the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Survey reports that:

Over the past week, the various monitoring parameters show that the Nevado del Ruiz volcano continues to exhibit unstable behavior.

The seismicity caused by rock fracturing, recorded an increase in the number of recorded earthquakes, however, the seismic energy released decreased compared to the previous week. The earthquakes were mainly located in the north, southwest, east and neighboring regions of the Arenas crater and to a lesser extent in the southern sector at depths ranging from 0.6 to 7.2 km. A seismic increase occurred between 21:00 on July 12 and 07:00 on July 13, which was located in the northern sector of the volcano, at depths between 5.0 and 7.2 km. The maximum magnitude recorded during the week was also increased and was 1.7 ML (local magnitude), which corresponds to an earthquake recorded on July 13 at 06:05 (local time), located north of Arenas crater, at a depth of 5.6 km.


The seismic activity associated with fluid dynamics in the volcanic structure showed a slight increase in the number of recorded earthquakes and values ​​similar to the seismic energy released during the previous week. This type of activity is mainly characterized by the occurrence of several seismic events of long period and very long period fluid type as well as tremor pulses of varying energy levels and durations.

Volcanic deformation, measured from electronic inclinometers, continues to record a deflationary process over the last few days.

In the tracking information provided by the NASA and FIRMES Mírová website, no thermal anomaly was identified during the week.

The gas and steam columns reached a maximum height of 1700 m measured on top of the volcano on 16 July.

The volcano Nevado del Ruiz continues to activity level Amarillo.


Source : Ingeominas.

Photo : Archive SGC


Yellowstone , United – States  :

44°25’48 » N 110°40’12 » W,
Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The University of Utah Seismograph Stations reports that a minor earthquake of magnitude 3.6 occurred at 02:31 PM on July 18, 2017
(MDT). The epicenter of the shock was located 9.3 mi N of W. Yellowstone, MT. This earthquake is part of an ongoing sequence
of earthquakes that began on June 12, 2017 and included a magnitude 4.4 event on June 15, 2017, 9.0 mi NNE of W. Yellowstone, MT. Today’s M 3.6 earthquake was reported felt in Yellowstone National Park and in West Yellowstone, MT. It was followed by numerous smaller earthquakes, the largest of which had magnitudes of 2.8 and 2.9. The total number of located earthquakes in the current sequence has now exceeded 1200.



Anyone who felt the earthquake is encouraged to fill out a survey form either on the Seismograph Stations website: www.quake.utah.edu or the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC): July 18, 2017 Time (UTC): 20:31
Date (local): July 18, 2017 Time (local): 02:31 PM MDT
Latitude: 44 47.25′ N
Longitude: 111 2.27′ W
Preferred magnitude: 3.60 Ml

A discussion of earthquake swarms, including videos of the 2010 Madison Plateau activity, was recently posted on the Yellowstone Volcano Observatory website: https://volcanoes.usgs.gov/volcanoes/yellowstone/monitoring_relocation.html

The current swarm currently contains many fewer earthquakes than that of 2010 (~2500 events). No significant changes in ground deformation or geothermal activity have been observed since the beginning of the 2017 earthquake swarm.

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.


Source : YVO

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