August 14, 2015. English. Mauna Loa , Chaparrastique, Popocatepetl.

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August 14, 2015. English. Mauna Loa , Chaparrastique, Popocatepetl.

August 14, 2015.

 

Mauna Loa , Hawai :

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

Monitoring data through the month of July 2015:

Seismicity:
Seismicity at Mauna Loa remains elevated in several parts of the volcano. Earthquake rates on the Upper Southwest Rift Zone (Sulfur Cone) and Mokuʻāweoweo Crater remain elevated, with over 150 located earthquakes occurring in July. There was a swarm on the west flank of Mauna Loa, approximately 100 located earthquakes. All earthquakes in the past month have been small relative to earthquake sequences observed before eruptions in 1975 and 1984.

mauna loa

This aerial view of Mauna Loa’s summit shows the cinder-cone and lava flows that were erupted in 1949. The crack extending down the left side of the cone is the northeast-southwest trending 1984 fissure that bisected the southwest flank of the cone during the initial phase of the eruption. Light-brown tephra erupted from the 1949 cone thins to the west. The steep caldera walls north (right) of the cone are 70 m (230 feet) high.

Deformation:
The Mauna Loa GPS network recorded modest net inflation over the month of July, with very little inflation in the second half of the month. Modeling of the pattern of motions since this current episode of inflation started in the summer of 2014 suggests at least two inflating reservoirs–a spherical reservoir near the southeast wall of the summit caldera, and a tabular body that lies beneath the caldera and upper Southwest Rift Zone.

Gas:
No significant changes in SO2 and CO2 were recorded by the continuous fumarole monitor during July, 2015. The fumarole temperature sensor leveled off a decline that began on 08 May. Since that time, the temperature has decreased from 82 to about 78.5 degrees.

 

 

Source : HVO

 

Chaparrastique, El Salvador :

Special Report No 65. Chaparrastique: The activity of the volcano increases
August 13, 2015 3:13 p.m.

The activity of the volcano continues to be abnormal on the Chaparrastique. During the last 24 hours, the seismic vibration of the volcano has fluctuated between 142 and 600 RSAM units, average per hour, with an average of 356 units, the normal value is 50 RSAM units (Figure 1).

 

chaparrastique
Figure 1. Anomalies in the seismic vibration of the volcano during the period from June to August 2015.

At 10:00 Thursday, August 13, monitoring cameras recorded the beginning of a volcano degassing process; there is no evidence of high temperatures. On images of pulses of gas, the color of emission of gas indicates emission of ash, which has not been verified by local observers. The gas monitoring station, located in the Casa de la Cultura de San Jorge, recorded between 600 and 1400 tonnes per day of sulfur dioxide emissions, which is considered as high values.

 

chaparrastique


These sudden changes in volcanic gas emissions and seismic vibrations are high indicator of fluid injection (gas, water or magma) in the system. The activity of the volcano is abnormal and unstable. It is not impossible to come face to the emergence of the issue of gas and ash, and even the presence of lava to the surface. In response, the MARN calls to journalists and individuals not approach the top of the volcano, because of the degree of danger it presents.

ORANGE alert level is maintained on the volcano

The MARN continues its enhanced device monitoring, and maintaining close communication with the General Directorate of Civil Defense and local observers.

Source : Marn .

Photo : laprensagrafica

 

Popocatepetl, Mexique :

August 13, 11:00 h (August 13, 16:00 GMT)

In the last 24 hours the seismic records of the surveillance system of Popocatepetl volcano registered 10 low-intensity exhalations, along with emissions of steam and gas. Besides, yesterday at 22:43 an explosion was recorded.
On the other hand, 20 minutes of harmonic tremor were recorded.

 

popo

 

Overnight incandesce was observerd over the crater, increasing when major exhalations .
At the time of this report there is no visibility to the volcano.
Other monitoring parameters remain unchanged.

CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater.

 

Source : Cenapred.

Photo : Exclusivas Puebla

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