Archive | Toxic Gases RSS for this section

Rise in seismic activity, hotter crater lake recorded at Taal Volcano in Taal, Philippines

Seismic activity and changes in Taal Volcano’s main crater lake have been observed on Monday despite the volcano under alert level 1 (abnormal), the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

In an advisory, the Phivolcs said 50 weak tremor episodes were recorded from 5 a.m. to 3 p.m., occurring at shallow depths. Seismic activity describes earthquake occurrences in the volcano.

This signals increased hydrothermal activity beneath Taal Volcano island.

“Tremors are typically not recorded,” Phivolcs director Renato Solidum told the Philippine News Agency (PNA) on Monday night.

The Phivolcs recorded 68 shallow tremor episodes in the volcano island since Feb. 13.

Solidum said the main crater lake is becoming more acidic and hotter.

Local government units are advised to prepare in case of the volcano’s renewed unrest and to assess previously evacuated barangays around Taal Lake for damages.

The public is urged to observe precautions due to possible ashfall, ground displacement across fissures, and minor earthquakes in the event of a phreatic eruption.

According to the advisory, geochemical data on the main crater lake indicate continuous acidification of lakewater from a pH 2.79 to pH 1.59 between January 2020 and February 2021, an unseasonal temperature high of 77 degrees Celsius and CO2/H2S gas flux ratios consistent with shallow magma degassing.

Phivolcs said there are increased possibilities of sudden steam-driven or phreatic explosions, lethal accumulations, or expulsions of volcanic gas and minor ashfall from the main crater that can occur and threaten areas within the Taal Volcano island.

Entry into the island, Taal’s Permanent Danger Zone, especially the vicinities of the main crater and the Daang Kastila fissure, must remain strictly prohibited, Phivolcs added.

Pilots are advised to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft.

Courtesy of

Volcanic Alert Level Raised to Level 2 at White Island Volcano in New Zealand

Aerial view of White Island volcano with an ash and gas plume (image: @nzherald/twitter)

GeoNet reported that an observations during the gas flight confirmed the presence of fine ash material in the plume. The fine particles originate from the main steam vent at the back of the crater lake. Initial analyses of the ash particles suggest that it is loose material from around the vent or underlying conduit being carried by the steam and gas emission.

Some of the particles may be carried a few kilometres downwind but are unlikely to reach the mainland. The gas and steam plume may be noticed on the mainland as weak acid rain. While the gas output observed yesterday is higher than recent observations, other monitoring parameters do not show significant changes.

Observations from the flight show there is no substantial change in the location and size of active vents. The rainfall has formed a pool of water on the floor of the 1978/90 Crater, re-forming a shallow lakelet.

During the past week, a small sequence of earthquakes has been located close to the volcano and an increase of volcanic tremor has been recorded.

The main plausible triggers for a sudden eruption with little or no warning remain the collapse of unstable material in an active vent and the possible ingress of water underground onto the shallow magma body.

Courtesy of

Continuing Lava Flow at Nevados de Chillán Volcano Chile

A minor explosion from Nevados de Chillán volcano yesterday (image: SERNAGEOMIN)

SERNAGEOMIN reported that the effusive-explosive eruption of the volcano continues and has remained essentially unchanged.

Courtesy of

Alert Level raised to Yellow at Korovin Volcano in Andreanof Islands, Aleutian Islands

Yellow Alert

The Alaska Volcano Observatory (AVO) reported that the alert level for the volcano was raised to “yellow”, as an increase of seismic activity and sulfur dioxide emissions has been recorded.

The instruments record volcano-tectonic earthquakes over the past two weeks associated with sulfur dioxide (SO2) deggasing detected on 15, 20 and 26 October.

AVO will continue to monitor the volcano for signs of volcanic activity.

Courtesy of

Lava Flow Has Increased At Reventador Volcano In Ecuador #Lava #ReventadorVolcano #Ecuador

Gas emissions from Reventador volcano yesterday (image: IGEPN)

Effusive-explosive eruption of the volcano continues.

IGEPN reported that the lava flow on the northeast flank has increased in length, currently about 400 m long.

Incandescence continues to be observed from the summit crater.

Near-constant ash emissions reached up to 14,000 ft (4,300 m) altitude and drifted NW.

3 thermal anomalies was detected in satellite images.

Courtesy of

Volcanic Caribbean island of Dominica shaken by explosion of steam and gas #Explosion #Steam #Gas #Volcanic #Dominica #Caribbean

Volcanic Activity Alert

An explosion of steam and gas in the mountains of the remote, jungle-clad Caribbean island of Dominica has shaken residents, who are fearful it is a harbinger for renewed seismic activity in a nation that is home to nine volcanoes.

The Dominica Office of Disaster Management and the Seismic Research team said the activity in the Soufriere area on Wednesday was likely the result of a landslide, followed by subsequent geological adjustments.

In a statement, the office’s coordinator Fitzroy Pascal said there had been no volcanic earthquakes recorded in the area associated with “the strong steam degassing.”

“It is possible that the area may still be unstable and that additional landslides may occur with continued steam degassing,” Pascal said.

Dominica last suffered major phreatic or steam-drive volcanic eruptions in 1997, and before that in 1880.

Soufriere resident Lynthia Bellot said that residents were worried by the activity, after a series of small tremors in 2018 and 2019.

“A lot of residents are concerned, I was taken aback and I was like, if it is a landslide why is smoke coming out? I still do not understand it, I still do not get it,” she said.

Memories are fresh in Dominica of Hurricane Maria, which in 2017 killed 65 people and ruined housing stock and infrastructure, while some of the island’s oldest trees were destroyed.

Courtesy of

Taal volcano update: Eruption alert as 116 earthquakes hit Philippines volcano overnight #earthquake TaalVolcano #philippines

Taal volcano update: Erupting Philippines volcano

The Philippines volcano is showing signs of volcanic activity (Image: GETTY/UNOCHA)

The volcano alert level for Taal is 3, meaning geologists are braced for an eruption in a matter of weeks. According to the Philippine Institute of Volcanology and Seismology (PHIVOLCS), Alert level 3 represents a high level of volcanic unrest.

The alert is marked by sustained seismic activity, plumes of smoke belching from Taal as well as toxic gas emissions and the movement of magma underground.

On Friday, PHIVOLCS warned of 116 tremors were detected around Taal volcano in the 24 hours since midnight GMT (8am local time).

The Taal Volcano Network recorded, in addition, two low-frequency earthquakes, which could be a sign of molten rock entering the volcano.

PHIVOLCS warned: “These earthquakes signify magmatic activity beneath the Taal edifice that could lead to eruptive activity at the Main Crater.”

The agency warned the residents of Luzon Island to stay clear of the volcano in a 4.3-mile-wide radius.

Access to the danger zone is restricted in parts of Agoncillo, Laurel and Batangas.

According to the UN Office for the Coordination of Humanitarian Affairs, about 486,000 people have been affected by the erupting volcano since January 12.

On Friday, the fiery mountain sitting in the middle of Taal Lake was coughing up plumes of dirty steam and smoke.

The volcanic plumes were seen reaching heights between 1,640ft and 2,296ft, drifting in a southwest direction.

At the same time, PHIVOLCS said emissions of toxic sulphur dioxide (SO2) have dropped below instrumental detection.

Although eruptive activity has ceased since two blasts tore through Taal on January 12 and January 13 respectively, the volcano is still at risk of erupting.

Since January 12, Philippine Seismic Network (PSN) has recorded a total of 763 volcanic earthquakes around Taal.

The seismic activity was marked by fissures splitting the ground open on the southern parts of Luzon Island.

At least 177 of the quakes peaked at magnitudes between 1.2 and magnitude 4.2.

Between January 29 and January 31, the PSN recorded seven quakes between magnitude 1.7 and magnitude 2.5.

PHIVOLCS warned on Friday of more earthquakes, steam-driven eruptions, ashfall and lethal gases venting from the volcano.

The agency said: “DOST-PHIVOLCS recommends that entry into the Taal Volcano Island as well as into areas over Taal Lake and communities west of the island within a 7km radius from the Main Crater must be strictly prohibited.

“Local government units are advised to assess areas outside the 7km radius for damages and road accessibilities and to strengthen preparedness, contingency and communication measures in case of renewed unrest.

“People are also advised to observe precautions due to ground displacement across fissures, frequent ashfall and minor earthquakes.”

Riverside communities are at risk of lahars – fast-moving streams of mud, debris and volcanic ash mixed with water, particularly after heavy rainfall.

PHIVOLCS said: “Civil aviation authorities must advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircrafts.

“DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders.”

Courtesy of

#Explosion at #PiparoMudVolcano Causes #Cracks to #Roads and #Homes in #Trinidad and #Tobago

Piparo Mud Volcano Trinidad & Tobago 22.09.2019

A loud explosion was heard by residents at 10:08 PM, with cracks appearing across roads, & homes at 10:20 PM across Pancho Trace.

11:30 PM Update: Though there has been no confirmed eruption at the Piparo Mud Volcano, there are cracks on the roadway, one home has been damaged due to property cracks, a landslip, and a high sulphur smell according to MP Barry Padarath. He also added, there are no ongoing evacuations but residents are on standby.

Courtesy of Trinidad and Tobago Weather Center

Facebook @TTWeatherCenter