June 11 , 2016. EN. Bulusan , Tungurahua , Ibu .

Home / blog georges Vitton / June 11 , 2016. EN. Bulusan , Tungurahua , Ibu .

June 11 , 2016. EN. Bulusan , Tungurahua , Ibu .

June 11 , 2016.


Bulusan , Philippines :


Bulusan Volcano’s seismic monitoring recorded one hundred thirteen (113) volcanic earthquakes during the past 24 hours. Weak emission of white steam plumes that rose up to 100 meters and drifted towards southwest was observed Precise leveling survey results from April 27 to May 5, 2016 indicated slight deflationary changes of the edifice relative to February 2016. However, the ground deformation measurements from continuous GPS data as of 2 June 2016 indicated slight inflation of the edifice since May 2016.



Bulusan Volcano (12.7667°N, 124.0500°E) generated a steam-driven explosion at 11:35 AM today. The event lasted for approximately 5 minutes based on the seismic record and produced approximately 2.0 kilometer-high grayish ash plume that drifted towards the northwest.


At 11:35 A.M. yesterday, a steam-driven eruption occurred on the west-northwest fissure vent of Bulusan Volcano summit that generated an estimated 2.0 kilometer-high grayish ash plume, which drifted to the northwest. The eruption was recorded as an explosion-type earthquake that lasted approximately five (5) minutes and was accompanied by rumbling sound reportedly heard at Puting Sapa, Rangas, and Añog of Juban and Mabini and Inlagadian of Casiguran. Thin ash fell over the barangays of Añog, Juban and Mabini, Casiguran. Traces of volcanic ash were observed in Casiguran (Brgys. Casay, Casiguran proper, Escuala, Inlagadian, San Antonio, San Juan) and Juban (Brgys. Aroroy, Juban proper, Puting Sapa, Rangas).

In the past 24 hours, Bulusan’s seismic monitoring network recorded a total of five (5) volcanic earthquakes including the explosion-type earthquake yesterday. Weak to moderate emission of white steam plumes that rose up to 150 meters and drifted towards north-northwest was observed. Precise leveling survey results from April 27 to May 5, 2016 indicated slight deflationary changes of the edifice relative to February 2016. However, the ground deformation measurements from continuous GPS data as of 2 June 2016 indicated slight inflation of the edifice since May 2016.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are ongoing beneath the volcano that may lead to steam-driven eruptions. The local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or phreatic eruptions.

Source : Phivolcs



Tungurahua , Ecuador :

Update of volcanic activity and analysis of its possible reactivation in the medium term (weeks to months)

The Tungurahua volcano has maintained a low surface activity since its last eruption (26/2 to 15 / 03/2016). The seismic activity and degassing remained at baseline levels, with the exception of a small swarm of seismic events long period (LP) which took place between 1 and 20 May, associated with movement of fluids. However, observations of deformation show a magmatic intrusion since the end of the last eruption.



Over the past 8 years, the Tungurahua volcano has repeatedly shown these periods of calm and apparent reactivation after presenting clear warning signs in the short term (hours to days) in only 20% of the time. Based on this and the rest time that took the volcano so far (79 days), it is estimated that the reactivation of Tungurahua in the medium term (weeks to months) is probable and two potential eruptive scenarios are defined:

1) a gradual reactivation of strombolian style, with ash fall mainly corresponding to the most likely scenario;
2) an early resumption of vulcanian style, with a large eruption column and pyroclastic flows.

In recent months, after the last eruption, low seismic activity in general (Fig. 1) is observed, registering less than 2 daily volcano-tectonic earthquakes type (VT), no explosion or tremor of emission. Between 1 and 20 May 2016, a small swarm of earthquakes long period type (LP) was recorded. These swarms are common in periods of quiescence and are associated with fluid movements within the volcano.

Informe Especial Tungurahua N. 6 - 2016Figure 1. Number of volcano-tectonic events (VT), long period (LP), explosion and tremor of emission of the Tungurahua issuance until 05/31/2016. The gray area is the last eruption of Tungurahua between 26/02 and 03/15/2016. Note the small swarm LP between 01 and 05.20.2016 in the red zone.

The inclinometer of Retu station (Refugio Tungurahua) north of the crater shows a clear inflationary trend (see arrow direction in Fig. 2) from the end of the last eruption of both the radial axis (~ 600 mrad microradians) and the tangential axis (~ 200 mrad). This trend is also observed in the tangential axis inclinometer on MNDR (Mandur, northwestern edge), but with a much smaller amplitude (~ 30 mrad), probably due to a larger distance between the instrument and the pressure source. In other stations of the network Inclinometry an apparent deformation pattern is observed.

 Informe Especial Tungurahua N. 6 - 2016
Figure 2. Graph deformation recorded by inclinometers Retu (Refugio Tungurahua) and MNDR (Mandur) until 30 May 2016. The gray area is the last eruption of Tungurahua. Inflationary trend is evident in both axes of Retu and the tangential axis of MNDR.

Emissions of SO2:
The most significant change is observed in the outgassing from the end of the last eruptive phase both the maximum daily flow of SO2, the number of valid measures. The two indicators are the basis.

Visual observations:
Over the past two months, visual observation conditions were variable. The surface activity when the volcano was clear, was characterized by fumaroles low intensity and lack of ash emissions since the end of the last eruption  .

Over the last 8 years of activity of the Tungurahua volcano, there have been 15 periods of calm similar to the current period with low seismic activity, deformation to inflationary trend, and an area of fumaroles activity characterized by low energy more than one month. Generally, these periods of silence were followed by small volcanic eruptions (VEI 0-1 Explosive Index, the main phenomenon is the ash fall) and sometimes by large eruptions (VEI 2, pyroclastic flows). It is important to note that the vast majority (80%) of these eruptions had no warning signs of recovery in the short term (hours to days).



The actual deformation of the volcano is the proof of the magmatic intrusion (movement of magma from a deep tank) and has been observed several times before the eruptions of Tungurahua. The low outgassing may indicate a blockage of the canal prevents the free passage of magmatic gases. Given that the current period of quiescence has exceeded two months (78 days), it is estimated that the recovery in the medium term (the next few weeks to several months) is probable.

These settings can be changed according to changes in the activity of the volcano and data analysis of instrumental and visual surveillance. The IGEPN maintains constant vigilance in the Terras center (Quito) and the Observatory of the Tungurahua volcano.


Source : IGEPN

Photo : José Luis Espinosa Naranjo.


Ibu , Indonesia :

Observing Reports, Ibu volcano
Friday, June 10, 2016

Sunny weather / rain, low wind from the east.
Mount Ibu is clear, haze, gray to white smoke rises from 200-600 m above the summit, leaning to the east.


107 x eruption earthquake, amplitude: 20-37 mm, length: 24-78 sec,
◎ 46 bursts of earthquakes, amplitude: 5-19 mm, length: 10-40 sec,
◎ 23 x avalanche earthquake, amplitude: 6 to 24.5 mm, length: 10-54 sec,
◎ 3 x Harmonic Tremors, amplitude: 18-36 mm, Length: 100-170 sec
1 x volcanic earthquakes amplitude: 33.8 mm, sp: 1.5 sec duration: 7 sec,
◎ 1 x tectonic earthquakes strong amplitude: 36 mm, sp:  , duration: 115 sec.

The activity level of Ibu volcano is at Level II (Waspada).

The communities around the Ibu volcano and visitors / tourists not to travel within a radius of 2.0 km and the danger zone is 3.5 km from the crater opened in the northern part of the active crater of Ibu volcano.

Source : Pvmbg



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