In this photo taken using slow camera shutter speed, hot lava runs down from the crater of Mount Merapi, in Sleman, Yogyakarta, Indonesia, early Monday, Aug. 9, 2021. Indonesia's most volatile volcano on the densely populated island of Java was erupting again Monday with searing gas clouds and lava flowing fast down its slopes.
Credit: AP Photo/Slamet Riyadi
Indonesia's most active volcano erupted Monday with its biggest lava flow in months, sending a river of lava and searing gas clouds flowing 3.5 kilometers (more than 2 miles) down its slopes on the densely populated island of Java.
The rumbling sound could be heard several kilometers (miles) away as Mount Merapi erupted, sending hot ash 600 meters (nearly 2,000 feet) into the sky. Ash blanketed nearby towns, but long-established evacuation orders are in place near the volcano, and no casualties were reported.
It was Merapi's biggest lava flow since authorities raised its danger level last November, said Hanik Humaida, the head of Yogyakarta's Volcanology and Geological Hazard Mitigation Center.
She said the lava dome just below Merapi's southwest rim and the lava dome in the crater both have been active since the end of July. The southwest rim dome volume was estimated at 1.8 million cubic meters (66.9 million cubic feet) and about 3 meter (9.8 feet) tall before partially collapsing Monday morning, sending pyroclastic flows traveled fast down the southwest flank at least twice.
The 2,968-meter (9,737-foot) peak is near Yogyakarta, an ancient city of several hundred thousand people embedded in a large metro area on the island of Java. The city is a center of Javanese culture and a seat of royal dynasties going back centuries.
In this photo taken using slow camera shutter speed, hot lava runs down from the crater of Mount Merapi, in Sleman, Yogyakarta, Indonesia, early Wednesday, Aug. 11, 2021. The volcano is the most volatile of more than 120 active volcanoes in the country, and is one of the most active worldwide.
Credit: AP Photo/Trisnadi
Merapi's alert status has been at the second highest of four levels since it began erupting last November, and the Volcanology and Geological Hazard Mitigation Center has not raised it despite the past week's increased volcanic activity.
People are advised to stay 5 kilometers (3.1 miles) from the crater's mouth and to beware of the peril of lava, the agency said.
Ash from the eruption blanketed several villages and nearby towns, Humaida said. Cloudy weather obscured views of the peak on Monday morning.
Mount Merapi is the most active of more than 120 active volcanoes in Indonesia and has repeatedly erupted with lava and gas clouds recently.
Authorities in November had evacuated nearly 2,000 people living on the fertile slopes of the mountain in Magelang and Sleman districts and about 550 more people in January, but most have since returned. Merapi's last major eruption in 2010 killed 347 people and caused the evacuation of 20,000 villagers.
Indonesia, an archipelago of 270 million people, is prone to earthquakes and volcanic activity because it sits along the Pacific "Ring of Fire," a horseshoe-shaped series of seismic fault lines around the ocean.
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Rare Natural Event in Alaska Sees 3 Volcanoes Erupting at The Same Time
MICHELLE STARR, 16 AUGUST 2021
Mount Pavlof pictured on 5 August 2021.
(John Milliard/AVO) goog_1239347988
Three volcanoes in the Alaskan chain of Aleutian islands are currently erupting, and two others are rumbling with disquiet.
According to a report by NBC, it's been at least seven years since three Aleutian volcanoes erupted simultaneously. This increased volcanic activity, at this point, is not causing any disruptions, but it is an interesting situation; since volcanoes can be unpredictable, scientists are keeping a careful watch.
The Great Sitkin volcano, Mount Pavlof, and the Semisopochnoi volcano are all at an orange volcano alert level as of Sunday 15 August, according to the Alaska Volcano Observatory.
This means that eruptions are currently underway, but they're relatively small, rumbly ones with minimal ash.
Only minute amounts of ash have been detected at Mount Pavlof and Semisopochnoi, and none from Great Sitkin. However, lava is flowing from Great Sitkin, and large seismic tremors and several explosions have been detected at Semisopochnoi.
In addition, Mount Cleveland and the volcanic complex on Atka have been showing signs of activity - increased heat under Mount Cleveland, and small earthquakes under Atka. Both are at a yellow volcano alert level.
Although such simultaneous volcanic activity in the Aleutians is uncommon, it's not unheard of. The Aleutian Arc is a chain of volcanoes spread along the subduction boundary between two tectonic plates - the Pacific Plate pushing beneath the North American Plate. The chain stretches from the Alaskan Peninsula to the Kamchatka Peninsula in Russia.
Often when volcanoes erupt, other nearby volcanoes in close proximity can be roused, but it's not always clear why. The Aleutian Arc is home to a different kind of mystery.
In 1996, volcanic and seismic activity was spread across 870 kilometers (540 miles) of the arc, which scientists concluded had to be more than coincidental, although the trigger is unknown.
In this case, it's not entirely clear what's going on either. Nearly 290 kilometers (180 miles) span between the two outermost volcanoes in this spate of activity, Great Sitkin and Semisopochnoi.
Last year, researchers found that a collection of volcanoes along the Aleutian Arc may be part of a larger supervolcano, but only one of the currently rumbly beasts, Mount Cleveland, is among the specified group.
Although there's nothing to worry about at this point, the event could turn out to be very scientifically interesting.
Geologists and volcanologists will no doubt be monitoring the situation to see if they can find a link to earlier outbreaks of simultaneous activity, and to try to learn more about this mysterious arc of volcanoes.
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Volcanoes Today, 16 Aug 2021: Fuego volcano, Karymsky, Merapi, Semeru, Shiveluch, Reventador, Nevados de Chillán, Nevado del Ruiz
Mon, 16 Aug 2021, 10:0010:00 AM | BY: VN
Satellite image of Suwanose-jima volcano on 16 Aug 2021
Satellite image of Merapi volcano on 15 Aug 2021
Satellite image of Semeru volcano on 15 Aug 2021
Karymsky (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 11000 ft (3400 m) altitude or flight level 110 and is moving at 10 kts in S direction.
The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:16/0520Z to 11000 ft (3400 m)
Shiveluch (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 10 kts in SE direction.
The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:16/0520Z to 15000 ft (4600 m)
Chirinkotan (Northern Kuriles, Russia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 10 kts in E direction.
The full report is as follows: VA CONTINUOUSLY OBS IN SATELLITE IMAGERY OBS VA DTG:16/0520Z to 15000 ft (4600 m)
Suwanose-jima (Ryukyu Islands): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTED AT 20210816/0323Z FL060 EXTD E OBS VA DTG:16/0330Z
Merapi (Central Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 12000 ft (3700 m) altitude or flight level 120 .
The full report is as follows: VA OBS TO FL120 MOV AT 15/2320Z OBS VA DTG:15/2315Z to 12000 ft (3700 m)
Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: CONTINUOUS VA EMISSIONS TO FL140 EXT TO W OBS VA DTG:15/2330Z
Semisopochnoi (United States, Aleutian Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Anchorage warned about a volcanic ash plume that rose up to estimated 10000 ft (3000 m) altitude or flight level 100 and is moving at 5 kts in SW direction.
The full report is as follows: LOW LEVEL VA ERUPTIONS HAVE RESUMED. to 10000 ft (3000 m)
Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 15 kts in W direction.
The full report is as follows: NEW VA EMS OBS to 15000 ft (4600 m)
Nevado del Ruiz (Colombia): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VA EMS HAS DISP
Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 16000 ft (4900 m) altitude or flight level 160 and is moving at 10 kts in W direction.
The full report is as follows: CONT VA EMS OBS to 16000 ft (4900 m)
Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 26000 ft (7900 m) altitude or flight level 260 and is moving at 15 kts in SE direction.
The full report is as follows: continuous ash emissions to 26000 ft (7900 m)
Nevados de Chillán (Central Chile): Volcanic Ash Advisory Center Buenos Aires (VAAC) issued the following report: SPORADICS EMISSIONS
The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:16/0520Z to 11000 ft (3400 m)
Shiveluch (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 10 kts in SE direction.
The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:16/0520Z to 15000 ft (4600 m)
Chirinkotan (Northern Kuriles, Russia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 10 kts in E direction.
The full report is as follows: VA CONTINUOUSLY OBS IN SATELLITE IMAGERY OBS VA DTG:16/0520Z to 15000 ft (4600 m)
Suwanose-jima (Ryukyu Islands): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTED AT 20210816/0323Z FL060 EXTD E OBS VA DTG:16/0330Z
Merapi (Central Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 12000 ft (3700 m) altitude or flight level 120 .
The full report is as follows: VA OBS TO FL120 MOV AT 15/2320Z OBS VA DTG:15/2315Z to 12000 ft (3700 m)
Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: CONTINUOUS VA EMISSIONS TO FL140 EXT TO W OBS VA DTG:15/2330Z
Semisopochnoi (United States, Aleutian Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Anchorage warned about a volcanic ash plume that rose up to estimated 10000 ft (3000 m) altitude or flight level 100 and is moving at 5 kts in SW direction.
The full report is as follows: LOW LEVEL VA ERUPTIONS HAVE RESUMED. to 10000 ft (3000 m)
Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 15 kts in W direction.
The full report is as follows: NEW VA EMS OBS to 15000 ft (4600 m)
Nevado del Ruiz (Colombia): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VA EMS HAS DISP
Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 16000 ft (4900 m) altitude or flight level 160 and is moving at 10 kts in W direction.
The full report is as follows: CONT VA EMS OBS to 16000 ft (4900 m)
Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 26000 ft (7900 m) altitude or flight level 260 and is moving at 15 kts in SE direction.
The full report is as follows: continuous ash emissions to 26000 ft (7900 m)
Nevados de Chillán (Central Chile): Volcanic Ash Advisory Center Buenos Aires (VAAC) issued the following report: SPORADICS EMISSIONS
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