BANDUNG - Tangkuban Parahu volcano was declared alert, after experiencing an eruption on Thursday night around 20.46 WIB.
Based on the information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG), the Geological Agency mentioned visually, surface activity after the eruption that occurred on July 26, 2019 was still dominated by blowing smoke from the main crater (Kawah Ratu) with a height of about 20 - 200 meters from the bottom crater, it had a weak to moderate pressure with white color, and thin to thick intensity.
The eruption occurred on August 1st 2019 at 20:46 WIB with the height of ash column observed ± 180 m from the bottom of the crater (± 2284 m above sea level). The gray ash column was observed leaning to north and northeast. This eruption was recorded on a seismogram with a maximum amplitude of 50 mm (overscale) and a duration of ± 11 minutes 23 seconds.
On August 2nd, 2019 at 00:43 WIB, eruption occurred with unobserved height of ash column. This eruption was recorded on a seismogram with a maximum amplitude of 50 mm (overscale) and a duration of ± 3 minutes and 6 seconds. Eruptions occurred again at 01:45, 03:57 and 04:06 (still ongoing until now) WIB. This eruption was recorded on a seismogram with a maximum amplitude of 50 mm (overscale).
"Seismically, the activity of Mount Tangkuban Parahu is still dominated by earthquakes that reflect activity at shallow depths in the form of gusts," Kasbani, Head of PVMBG, Friday (2/8).
After the eruption, seismic recordings were dominated by continuous gusts and tremors with a maximum amplitude of 0.5-31 mm (dominant 0.5-20 mm). This recorded tremor was related to the release of pressure in the form of gusts that occur until now, it was followed by a series of eruptions on 1 and 2 August 2019.
In accordance with deformation, after the Eruption on July 26, 2019, Tangkuban Parahu volcano still experienced a small amount of local inflation. Deformation data still indicated the activity of Mount Tangkuban Parahu that was still unstable. In geochemical gas, after Eruption on July 26, 2019, in the area around Kawah Ratu showed the results of H2S volcanic gas concentrations measurements and tended to decrease. However, gas measurements on July 31 and August 1 2019 showed that gas concentrations were still fluctuating and tended to rise.
"Mount Tangkuban Parahu activity is still in an unstable condition, and the activity and potential eruption can change at any time," he said.
The current threat of hazard are ash rain and volcanic gas gusts with fluctuating concentrations around Kawah Ratu that can endanger the health and safety of visitors, traders, and surrounding communities if the tendency of volcanic gas concentrations is high. Phreatic eruption and ash rain around the crater have potential to occur without any obvious volcanic symptoms.
"The community around Mount Tangkuban Parahu and visitors or tourists or climbers, not approach the crater at the top of Mount Tangkuban Parahu within a radius of 1.5 Km from the active crater," he concluded. Jo