Volcanoes
A level-two yellow alert warning remains in effect following a second eruption at 6:34pm which sent a column of ash in a north-northwestern direction, following the initial eruption at 5:55am.
Mexican authorities have warned people to stay away from the crater due to the danger of falling "ballistic fragments," and called for extra attention to possible landslides. They also warned locals that ash may cover towns in the surrounding area.
Researchers studying ancient deposits from El Salvador's Ilopango volcano knew that a massive eruption had taken place there sometime between the third and sixth centuries. That event, dubbed Tierra Blanca Joven (TBJ), or "white young earth," sent a volcanic plume towering nearly 50 kilometers into the atmosphere.
To better pin down the date of this eruption, the scientists collected slices from three tree trunks embedded in TBJ volcanic ash 25 to 30 kilometers from the present-day lake that covers the caldera (above). The tropical hardwood trees likely died after being engulfed by the searing hot, gale-force winds containing the volcanic gases, ash, and pumice that would have swept outward after the eruption.
On 7 Aug, an observer sent us the following report:
"At around 10:40am on Wednesday 7 August, we noticed large clouds of smoke on the horizon at the location of Fonualei volcano. The plume continued to get larger over the next few hours. It seemed to pause and then erupt again."
In its latest report a few hours ago, CENAPRED reported that during the most recent 24 hour interval, the volcano produced 162 exhalations (passive emissions of steam, gas and low amounts of ash), 13 explosions at 00:34, 01:00, 01:45 (image 1), 01:47, 02:08, 02:27, 02:33, 03: 20, 03:39, 05:56, 06:44, 08:10 and 08:27 local time, as well as 711 minutes of tremor.
Clearly, the flux of magma currently rising inside the volcano is elevated compared to the average of the pat years. This could calm down gradually again or increase further, something impossible to predict. The alert level remains unchanged at "Yellow Phase 2".
Mount Merapi spewed the hot lava as far as 950 meters, heading to upstream of Gendol River in the two provinces' border area at 04:52 Jakarta time, Spokesperson of Indonesia's National Disaster Management Agency (BNPB) Agus Wibowo said.
The hot lava emission from the Merapi crater lasted around 95 seconds was recorded to have maximum amplitude of 50 millimeters, he added.
The volcano that stands at 2,968 meters tall above the sea level has been showing significant escalation of volcanic activities in the last several days with 10 intense land tremors were recorded in various degrees on Saturday.
"A moderate eruptive activity of the volcano continues and ash explosions of up to 6 km could occur at any time," it said in a statement, warning that it could affect low-flying aircraft.
The institute has attributed orange color code to the activity, which under the aviation color code map signifies that a volcano is exhibiting heightened unrest with an increased likelihood of eruption or that a volcanic eruption is underway with either minor ash emission or none at all.
As one of the most active volcanoes on the peninsula, the 1,486-meter-high Karymsky volcano is located 115 km north of Petropavlovsk-Kamchatsky, the administrative center of Kamchatka region.
Since the eruption started, two volcanic fissures split the mountain's east flank wide open, spewing rivers of lava towards the coast.
Aerial pictures of the volcano show bright streams of molten rock slowly making their way towards the coastal highway RN2.
Amateur volcanologists and witnesses to the incredible event were photographed watching the eruption along the same road.
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Screengrab captured by Jiji Press from a Japan Meteorological Agency surveillance camera on Aug 7, 2019 showing an eruption of Mount Asama in central Japan.
Mount Asama, about 140km northwest of the Japanese capital, exploded overnight and prompted the national meteorological agency to raise its alert level to three out of five, meaning people should avoid the crater.
The agency warned that large rocks and fast-moving flows of hot gas could affect a radius of 4km from the crater and that nearby towns could be hit by smaller rocks and ash depending on prevailing winds.













Comment: Popocatépetl volcano (Mexico): Elevated activity, 13 explosions during 24 hours