• Cleveland Current Activity
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Pertinent portions of past information releases are below. Full archive copies of all reports can be found in the Updates section of this site.

• Thursday, July 7, 2005 3:55 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    Previous Level of Concern Color Code: Not Assigned

    Satellite images collected over the past several days have provided additional evidence of increased activity at Cleveland volcano and the Level of Concern Color Code is now assigned at YELLOW. These images show increased heat flow, thin ash deposits, and possible debris flows extending down the volcano's flanks from the summit crater for ~2 kilometers (~ 6500 ft). Cleveland volcano is not seismically monitored, so satellite images are the primary source of information.

    Historical eruptions at Cleveland volcano have been characterized by short-lived explosive bursts of ash, at times accompanied by lava fountaining, lava flows, and debris flows down the flanks. Based on this record, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, July 8, 2005 3:00 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    Satellite images collected this week have provided evidence of increased activity at Cleveland volcano and the Level of Concern Color Code was assigned at YELLOW on Thursday, July 7. These images show increased heat flow, thin ash deposits, and possible debris flows extending down the volcano's flanks from the summit crater for ~1 kilometers (~ 3,280 ft) ft). Cleveland volcano is not seismically monitored, so satellite images are the primary source of information.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, July 15, 2005 1:40 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    No new information about the state of unrest at Cleveland Volcano was obtained this week. Cloudy conditions obscured the volcano in satellite images collected throughout the week and AVO received no new information about activity at the volcano.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, July 22, 2005 12:00 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    On Monday, July 18th, AVO received supplementary satellite imagery that had been acquired the previous week. The imagery showed steaming at the summit and evidence of minor ash emissions. Normal satellite views this week were all cloudy, so AVO received no new information about activity at the volcano.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, July 29, 2005 11:00 AM AKDT
  • Current Level of Concern Color Code: YELLOW
    Occasional clear satellite imagery of Cleveland this week showed minor steaming at the summit, possible, very localized ash deposits, and a weak thermal anomaly. Together, these observations suggest low-level volcanic unrest continues.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, August 5, 2005 11:40 AM AKDT
  • Current Level of Concern Color Code: YELLOW
    Clouds obscured views of the volcano much of the week preventing detailed satellite observations. Weak thermal anomalies were detected on 7/29 and 8/04 indicating continued, low-level unrest.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, August 12, 2005 11:35 AM AKDT
  • Current Level of Concern Color Code: YELLOW
    Clouds obscured views of the volcano during much of the week preventing detailed satellite observations. Weak thermal anomalies were detected during occasional clear periods indicating continued, low-level unrest.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, August 19, 2005 12:00 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    Clouds obscured views of the volcano during much of the week and satellite observations were possible on only one evening. No thermal anomalies were detected at that time. Low-level unrest may still be occurring, but is likely waning in intensity.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Friday, August 26, 2005 1:30 PM AKDT
  • Current Level of Concern Color Code: YELLOW
    Clouds obscured views of the volcano during much of the week. However, when the volcano was visible, no thermal anomalies were detected. Low-level unrest may still be occurring, but is likely waning in intensity.

    Based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.

• Saturday, August 27, 2005 11:20 AM AKDT
  • Previous Level of Concern Color Code: YELLOW
    Current Level of Concern Color Code: Not Assigned

    (Note: Cleveland volcano does not have a real-time seismic network; volcanoes without seismic networks are not assigned a color code of Green because without the seismic data, AVO has no definitive information that the level of activity of the volcano is at background)

    AVO is lowering the color code for Cleveland volcano from Yellow to "Not Assigned". The last evidence of activity at Cleveland was a thermal feature seen in a satellite image August 11. Since then AVO has had several good satellite views of the volcano, but no evidence of further activity has been seen. Also, we have not received any pilot reports of activity. AVO moved Cleveland to color code Yellow on July 7 when satellite images showed increased heat flow, thin ash deposits, and possible debris flows extending down the volcano's flanks.

• Friday, September 2, 2005 12:45 AM AKDT
  • Current Level of Concern Color Code: Not Assigned

    A thermal feature has been detected in several satellite images obtained on August 31 this week but no evidence of eruptive activity has been observed. Also, AVO has received no pilot reports of activity. Cleveland volcano does not have a real-time seismic network and without seismic data, AVO has no definitive information about the level of activity of the volcano unless clear satellite views can be obtained. The presence of a thermal feature at the summit of the volcano may indicate that low-level activity could occur in the near future.