Volcano Watch 2007

IG reported that during 17-18 April, Strombolian activity from Tungurahua was observed; incandescent material was ejected about 500 m above the summit and blocks descended down the flanks. Lahars carring large blocks NW down the
During 17-24 April, ash plumes rose to altitudes of 5.5-9 km (18,000-29,500 ft) a.s.l. and drifted W and N. Ashfall was reported from areas mainly to the N, NW, W, and SW during 17, 19, 21-22, and 24 April.
On 23 April, lahars were observed in several gorges to the NW. Clouds.

Another brief, but intense eruption occured at Etna on April 11, 2007.
Lava fountains erupted from the SE crater and two lava flows emerged from the vent at the base of the SE cone at 3050 m, flowing into Valle del Bove.
The eruption lasted for 5 hrs and the most advanced lava flow front reached 1900 m elevation in the Valle del Bove.

On 18 of April, Nevado del Huila had a moderately strong ash eruption causing ash fall and lahars on its flancs due to melted snow and ice water. About 8000 people have been evacuated. After the explosion, seismic activity at the volcano has decreased again.

Update source, YVO
Tuesday, May 1, 2007 11:37 MDT
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

April 2007 Yellowstone Seismicity Summary

During the month of April 2007, 53 earthquakes were located in the Yellowstone area. The largest of these shocks was a magnitude 2.1 on April 22, 2007 at 12:35 AM MDT, located about 7 miles southwest of West Thumb, Wyoming.

Earthquake activity in the Yellowstone region is at relatively low background levels. No earthquake swarms were identified in this report period.


Ground Deformation Summary: Through April 2007, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 32 months is ~15 cm at the White Lake GPS station. An example can be found at: www.mines.utah.edu...


The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

An article on another recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: volcanoes.usgs.gov...

The eruption ended abruptly shortly after midnight early on 1 May.

Mt Etna in Italy began erupting violently again last night, spewing lava fountains almost 500 feet in the air from the south-eastern crater.

So far there is no threat to inhabited areas. Lava also oozed from fissures at the base of the same crater towards the Valle del Bove.

Monday, June 4, 2007 10:09 MDT
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

May 2007 Yellowstone Seismicity Summary

During the month of May 2007, 59 earthquakes were located in the Yellowstone Region. The largest of these shocks was a magnitude 2.7 on May 1, 2007 at 3:09 AM MDT, located about 16 miles southwest of West Thumb, Wyoming. A small swarm of 14 earthquakes of magnitude 0.9 to 2.7, including the largest event, occurred on May 1st also about 16 miles southwest of West Thumb.

Earthquake activity in the Yellowstone region is at relatively low background levels.


Ground Deformation Summary: Through May 2007, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 33 months is ~15 cm at the White Lake GPS station. An example can be found at: www.mines.utah.edu...


The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

An article on another recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: volcanoes.usgs.gov...

Monday, July 2, 2007 10:37 MDT
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

June 2007 Yellowstone Seismicity Summary

During the month of June 2007, 73 earthquakes were located in the Yellowstone Region. The largest of these shocks was a magnitude 1.5 on June 27, 2007 at 3:22 PM MDT, located about 5 miles south southwest of West Thumb, Wyoming. A small swarm of 26 earthquakes of magnitude -0.5 to 1.4, occured on June 20 about 6 miles west of Norris Junction, WY.

Earthquake activity in the Yellowstone region is at relatively low background levels


Ground Deformation Summary: Through June 2007, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 33 months is ~15 cm at the White Lake GPS station. An example can be found at: www.mines.utah.edu...


The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

An article on another recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: volcanoes.usgs.gov...

SEPTEMBER 2007 Yellowstone Seismicity Summary

During the month of September 2007, 54 earthquakes were located in the Yellowstone Region. The largest of these shocks was a magnitude 2.3 on September 10, 2007 at 4:30 PM MDT, located about 13 miles north northwest of Madison Junction, Wyoming.
No earthquakes were reported felt during September.

Earthquake activity in the Yellowstone region is at relatively low background levels.

Ground Deformation Summary: Through September 2007, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 36 months is ~17 cm at the White Lake GPS station. An example can be found at: pboweb.unavco.org...

The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

An article on another recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: volcanoes.usgs.gov...

Activity at Anak Krakatau increased yesterday and there were several small eruptions," said Surono, a leading government volcanologist who, like many Indonesians, uses one name. "We have upgraded the alert level to the second highest."