signs impending volcanoes

• Recent advancements in predicting and monitoring volcanic activity have significantly reduced volcanic risks.
• 1. Occurrence of --- or increase in the frequency of small earthquakes.

  tremors
• 2. Deformation in the ground manifested by

  changes in ground elevation (tilting) and formation of cracks or openings (ground fissuring). All these observations can support the speculation that rocks are being pushed upward and out of the crater of the volcano.
• 3. Increase in the --- and in ---, which may indicate that the magma has gone closer to the surface.

  number of volcanic gases, temperature
• 4. Glow of --- due to the presence of magma

  volcanic crater
• 5. Increase in --- coming from volcanic openings, fissures, or hot springs.

  steam emission
• 6. --- changes within the surroundings of the volcano.

  Thermal
• 7. Change in the --- (The color changes in vegetation and lakes are due to the dissolution of minerals and other acidic chemicals from the volcano that found their way into these open areas.)

  color of nearby vegetation and lakes
• 8. --- not due to heavy rains.

  Landslides and rockfall
• 9. Drying up of --- around the volcano.

  springs and freshwater sources
• Increase in steam emission coming from volcanic openings, fissures, or hot springs
• Increase in the number of volcanic gases and in temperature
• Occurrence of tremors or increase in the frequency of small earthquakes
• Glow of volcanic crater due to the presence of magma
• Deformation in the ground manifested by changes in ground elevation (tilting) and formation of cracks or openings (ground fissuring)
• Signs of an Impending Volcanic Eruption

  1. Occurrence of tremors or increase in the frequency of small earthquakes.

  2. Deformation in the ground manifested by changes in ground elevation (tilting) and formation of cracks or openings (ground fissuring). All these observations can support the speculation that rocks are being pushed upward and out of the crater of the volcano.

  3. Increase in the number of volcanic gases and in temperature, which may indicate that the magma has gone closer to the surface.
• Signs of an Impending Volcanic Eruption

  4. Glow of volcanic crater due to the presence of magma

  5. Increase in steam emission coming from volcanic openings, fissures, or hot springs.

  6. Thermal changes within the surroundings of the volcano.
• Signs of an Impending Volcanic Eruption


  7. Change in the color of nearby vegetation and lakes (The color changes in vegetation and lakes are due to the dissolution of minerals and other acidic chemicals from the volcano that found their way into these open areas.)

  8. Landslides and rockfall not due to heavy rains.

  9. Drying up of springs and freshwater sources around the volcano.