Nevado del Ruiz Volcano, Colombia - increased activity

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SUMMARY

The Servicio Geológico Colombiano (SGC) reported significant seismic activity at Nevado del Ruiz, with a notable increase in earthquakes starting March 24, 2023. On March 30, the volcano recorded 11,600 earthquakes, marking the highest daily count since monitoring began in 1985. The Alert Level was raised to Orange, Level II, due to the increased seismicity and associated ash emissions, with the tallest plume reaching 1.8 km above the summit. Historical context highlights the volcano's potential for catastrophic eruptions, as evidenced by the 1985 disaster that resulted in 23,000 fatalities.

PREREQUISITES
  • Understanding of volcanic activity and seismic monitoring techniques
  • Familiarity with geological hazard assessment and alert level systems
  • Knowledge of the historical impact of volcanic eruptions, particularly in Colombia
  • Awareness of evacuation protocols in volcanic regions
NEXT STEPS
  • Research the seismic monitoring methods used by the Servicio Geológico Colombiano
  • Study the geological history of Nevado del Ruiz and its past eruptions
  • Examine the implications of volcanic ash emissions on air quality and aviation
  • Learn about emergency preparedness and evacuation strategies for volcanic eruptions
USEFUL FOR

Geologists, emergency management professionals, environmental scientists, and residents in volcanic regions will benefit from this discussion, particularly those focused on understanding volcanic hazards and preparedness strategies.

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https://volcano.si.edu/volcano.cfm?vn=351020

Servicio Geológico Colombiano’s (SGC) reported that thermal anomalies, persistent in Arenas Crater at Nevado del Ruiz since October 2022, were low-to-moderate in intensity. Seismicity increased significantly on 24 March, characterized by rock-fracturing earthquakes mainly located 2-5 km SW of Arenas crater at depths of 2-4 km. On 28 March there were 6,500 of these events, the highest daily count since 2010. The number of daily events continued to increase and on 29 March the seismic network recorded 11,000 earthquakes, the highest daily count since seismic monitoring began in 1985; on 30 March there were 11,600 earthquakes. The maximum magnitudes per day were also increasing, with a M 2.6 on 24 March, a M 2.7 on 29 March, and a M 3.1 on 30 March. The earthquake locations migrated towards Arenas Crater, though the depths remained within the same range. The Alert Level was raised to Orange, Level II (the second highest level on a four-level scale) on 30 March. In addition to the swarm, seismic signals indicating fluid movement continued to be recorded and some were associated with ash emissions; the tallest plume on 30 March rose 1.8 km above the summit and drifted NW and SW.

The Street reported, "The last time the Nevado del Ruiz volcano was active, it erupted and killed 23,000 people in Colombia, wiping out the town of Armero in the process."

Pay attention to volcanoes in the neighborhood and be prepared to evacuate.Eight days ago, about April 3.

As of April 9

 
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