The activity of Lokon, in the period from February 5, 2016 until March 7, 2016, visually did not indicate any abnormalities or changes to important parts of the crater. The activity is currently dominated by a strong seismic activity in bursts with gas columns that reached 200 m above the crater.
The evaluation data for the period from 5 February to 7 March 2016 can be described as follows:
Statistics show that there has been no eruption seismicity during the period from September 2015 to March 7, 2016. Volcanic earthquakes, particularly shallow (VB) increased on March 6, 2016, up to the number than 98. According to the calculations of volcanic energy, volcanic activity until 7 March showed an increase. Tremor type of events have also experienced an increase in value of maximum amplitude.
The volcanic activity of Lokon during the period from 5 February to 7 March 2016 was characterized by shallow earthquakes being recorded (VB) with numbers that fluctuate so that phreatic eruptions (steam explosion) can occur suddenly, especially during heavy rainfall.
The EMP seismogram station (Mount Empung) in the last 24 hours indicates that the recording sequence of the seismicity is dominated by volcanic earthquakes shallow waves with characteristics arrival / occurrence of earthquake more affirmed and have tend to be of greater amplitude.
Earthquakes of dominant frequencies which have been detected in the period from 24 February to 7 March 2016 are generally higher than 8 Hz (high frequency). Physically, the high frequency volcanic activity indicates a fracturing of rocks in the edifice due to increased volcanic pressure, magmatic / hydrothermal.
The deformation using the tiltmeter method (Tilting) shows changes to the Y / radial axis (crater), which indicate the inflation of the Lokon. Inflation can occur due to the increased pressure under the surface due to movements of the dynamics of magmatic / hydrothermal fluids. As for the X axis / tangential (perpendicular to the crater), it showed no significant change.
The results of the evaluation of data on visual observations, seismicity and deformation during the period from 5 February to 7 March 2016 showed that the activity of Mount Lokon has increased significantly. Therefore, the level of activity of Lokon is raised from level II (Waspada) to Level III (Siaga) from March 8, 2016 at 2:00 p.m..
April 08 , 2016.Lokon-Empung , Indonésia :
Source : VSI
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