Eruptions at Ubinas and Bromo.

The Geophysical Institute of Peru (IGP) reports since 2 h 35 July 19 an intense explosive activity on the volcano Ubinas.

Three volcanic explosions generated energy equivalent to earthquakes of magnitude 5.8, M5.3 and M4.1. as well as typical tremors of intense ash and gas emissions.

The deformation of the volcanic structure does not show any anomalies, and TROPOMI (SO₂) and MIROVA data do not show any significant changes.

The column of ash has exceeded 7 km height above the crater level / 12.2 km asl. According to VAAC Buenos Aires, the cloud spreads towards Bolivia.

At present, ash falls have been recorded in the cities of Ubinas, Escacha, Anascapa, Matalaque, San Miguel, Huarina, Tonohaya, for which an ash dispersal alert has also been launched so that the authorities and take steps to prevent harm to health.

The IGP reports that between 1 and 15 July, Ubinas seismic activity remained high with an average of 279 volcano-tectonic earthquakes per day, and 116 LP / day earthquakes (in relation to fluid movements). Blue emissions emanated from the crater (SO₂)

As a result, the IGP has prepared a new activity report in which it recommends changing the alert level from yellow to orange, with a prohibited area of ​​at least 15 km radius around the crater.

The National Center for Vulcanology (CENVUL), the IGP country service for monitoring and issuing volcanic warnings, conducts ongoing analysis of the activity from the city of Arequipa using the monitoring network installed on the volcano composed of 6 seismic stations, 2 scientific cameras, as well as GPS stations and inclinometers to determine the possible deformations.

This is the highest eruption seen in 342 years, considered as level VEI 3 (Ubinas is more accustomed to levels of IEV 2, more moderate)

Sources: IG Peru / OVI / Ingemmet; VAAC Buenos Aires, Satellite Goes.

The Bromo erupted on July 19 at 16:37 local; its eruption was accompanied by a "bang" and rumblings. The recording is characterized by a max. 37 mm, and a duration of 7 minutes and 14 seconds.

The height of the plume could not be detected due to poor weather conditions.

Two areas of the Regency of Malang were affected by fine ash, including the village of Gubuklakah about 14.4 km away, where a smell of sulfur was perceptible.

An orange VONA has been issued by the CVGHM.

The 4x4 vehicles' lorries, located near the temple, immediately dispersed to safer areas as soon as they heard the noise and saw part of the eruptive plume, motivated by the drivers.

The PVMBG reports for July 19 five eruption earthquakes, three blast earthquakes, a shallow volcanic earthquake and a continuous tremor of amplitude between 0.5 and 37mm, with a dominant at 1mm.

The level of activity remains at 2 / waspada, with a 1km forbidden zone.

In addition, a "cold lahar" sank in the sea of ​​sand at the edge of the volcano, and impacted the village of Ngadas, where the mudslides ceased in the evening.

The PVMBG states that this flow of water with rocky materials up to the size of sand ash, which occurred on July 19, 2019 at around 5 pm, is an ordinary natural phenomenon and is not directly related to the Gunung Bromo eruption.

The floods are caused by rain that falls around the Tengger Caldera and the summit of G. Bromo, as well as eruptions that produce volcanic ash. In addition, the morphology of the Tengger caldera is a low topography surrounded by hills, so that in case of rain, the flow of water moves down the caldera.

The flood came from the south-west side of the G. Bromo slope, encircling G. Batok to the west. The vibration of the flood was recorded in a seismograph with a maximum amplitude of 1 mm and an earthquake duration of 3 minutes 20 seconds.

Sources: PVMBG, Magma Indonesia, beritajatim.com and Suara.com (via Jackie Zwahlen)