October 07, 2015 . English . Ubinas, Sabancaya, Mauna Loa .

Home / blog georges Vitton / October 07, 2015 . English . Ubinas, Sabancaya, Mauna Loa .

October 07, 2015 . English . Ubinas, Sabancaya, Mauna Loa .

October 07, 2015 .


Ubinas, Perou :

LP type of earthquakes associated with fluid movements, showed increased activity in the previous period with a peak of 362 LP on September 30th. Since then, they have shown a downward trend, currently 150 LPs / day was observed (for 244 LP / day -Report Nº41-2015). In addition, the energy values are low.

With regard to the hybrid seismic activity associated with magma ascent, it shows weak but persistent levels. During this period, there was an average of 14 HIB / day (slightly above the average for the previous week). The energy levels of these hybrid events are low.
The type of VT seismicity (earthquakes rock fracturing) has a tendency to decrease continuouly. This week there were 67 VT / day (Nº41-2015 Report showed 97 VT / day). Low energy values are observed. This means that the internal pressure decreases.
Tremor type events relating to ash emissions have accumulated over this period 3.7 hours recording. 57% of this activity took place on September 30 and is associated with ash emissions during that day.
During this period, there were no explosions / expirations.



Between 29 and October 5, have been observed emissions of ash from the volcano Ubinas. With the camera Campbell Scientific, the occurrence of these events helped to further develop the ash fall alerts respectively in affected villages that were warned.
The first of these events took place on September 29 at 3:31 p.m. exactly local time. The ash plume rose to 2000 meters and was dispersed by the wind to the north, east and southeast of the volcano. The second showed up the next day, September 30, at 16:30 am. This time, the ash reached only 1400 meters above the base of the crater and were scattered to the south and southeast of the Ubinas
After these events, no major ash emission was recorded. The fumaroles activity in recent days is represented by sporadic gas emissions and water vapor.

The system Mirova has not detected thermal anomalies during this period.



Source : IGP


Sabancaya, Perou :

In general and particularly for that period, the activity of Sabancaya remains at low levels in its seismic monitoring parameters and satellite. The product mainly emitted by the volcano corresponds to steam and magmatic gas. The average seismic events for this period are: 56 LPs / day, 4 HIB / day, 12 Trem / day and 6 VTP. The number of VTP or proximal earthquakes recorded volcano tectonic (less than 6 km from the crater of the volcano Sabancaya) were very low, showing only an average of 6 VTP / day. We has been successful in locate only three VTP events, one being of magnitude 2.6 ML.


There was a second temperature measurement in the crater, registered on October 1, which gives a value of 378 °, a value comparable to that of July 2015 (391 ° C).
The maximum height of fumarole vents remained similar to the previous report, reaching 600-1500 m above the crater. We could discern whitish gas (water vapor) and sporadic emissions bluish (magmatic gases).
The satellite monitoring of the density of SO2 and thermal anomalies showed no significant values.

Source : IGP

Photo : 80 jours voyage


Mauna Loa, Hawai :


19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

On Thursday, September 17, the Volcano Alert Level and Aviation Color Code for Mauna Loa was elevated to Advisory/Yellow based on long-term trends in both earthquake and deformation monitoring data.



TOP: Mauna Loa weekly earthquake rates between 2010 and September 17, 2015. Blue bars indicate the number of earthquakes that were located by the USGS Hawaiian Volcano Observatory seismic network. Earthquakes of all magnitudes are plotted. Subtle increases in earthquake rates started in mid-2013, while more obvious changes in rates started in 2014.
BOTTOM: Change in distance across Mauna Loa’s summit caldera between 2010 and September 17, 2015. Blue dots indicate the relative distance between two stations that span the summit caldera of Mauna Loa, shown in the map on the upper left. Sustained extension across the caldera started in mid-2014. This extension is one of the indicators of magma infilling a complex reservoir system beneath the summit and upper Southwest Rift Zone.

mauna loa

The 1940 cone, just above center, pokes up above the otherwise relatively flat floor of Mokuʻāweoweo – the summit caldera of Mauna Loa. Mauna Kea rises up in the background

Activity Summary:
Mauna Loa is not erupting. Elevated seismicity is noted, though at a lower weekly rate than those reported mid- to late-summer. Earthquakes occurred beneath Mauna Loa’s upper Southwest Rift Zone and upper west flank at depths less than 13 km (8 miles). Deformation data continue to reflect inflation of magma reservoirs beneath Mauna Loa’s summit and upper Southwest Rift Zone.

Source : HVO

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