On March 7 until 24.00 pm, it was recorded three distant tectonic earthquakes (TJ), 25 volcanic earthquakes (VA), 138 shallow volcanic earthquakes (VB) 23 earthquake swarms. Continuous volcanic tremor vibration was recorded with a maximum amplitude of 0.5 to 4 mm.
The activity of G. Lokon in the period from February 5, 2016 until March 7, 2016 did not visually indicated any anomalies or significant changes in the crater. The activity is currently dominated by high seismicity, emission gusts that reached 200 m above the crater.
Evaluation data in the period from 5 February to 7 March 2016 can be described as follows:
Volcanic earthquakes, volcanic earthquakes shallow (VB) have increased since March 6, 2016, with the onset of 98 events. According to calculations, the volcanic energy also show an increase. The value of the tremor has 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 (VB) as well as phreatic eruptions (steam explosion) suddenly occurring, especially during heavy rainfall.
Earthquakes dominant frequencies which have been detected in the period from 24 February to 7 March 2016 were generally on higher frequency to 8 Hz (high frequency). Physically, the high frequency content of volcanic activity indicates a fracture of rocks due to the increased pressure.
The measurement of the deformation for the Y / radial axis (crater) shows changes that indicate the inflation of Lokon. Inflation can occur due to the increased pressure under the surface due to fluid dynamic movement magmatic / hydrothermal. As for the X axis / tangential (perpendicular crater), it showed no significant change.
The results of the evaluation of data on visual observations, seismicity and deformation during the period from February 5 to March 7, 2016 have shown that the activity of Mount Mount Lokon has increased significantly. Therefore, the level of activity of Mount Lokon- Empung is raised from level II (Waspada) to Level III (Siaga) on March 8, 2016 at 14:00.
Intensive monitoring conducted to assess the activity of Mount Lokon and distribution of information about the danger of the eruption of Mount Lokon continue regularly.
March 09, 2016. Lokon-Empung , Indonesia :
Source : VSI
Photo : AP