Signs Flashcards
Type of increase due to volcanic quakes with rumbling sounds
Increase in frequency
Change in color of the steam (white to gray)
Increased steaming activity
Presence of magma at or near the crater
Crater glow
inflation of the ground, results landslides and drying up of nearby slopes or vegetation
Ground swell
Results high temperature in hot springs, wells, and crater lake
Increase in temperature
No water in springs/wells near the volcano
Drying up of springs/wells
Creation of new spots resulted from volcanic activity
New thermal areas
instruments that detect and record earthquakes
Seismometer and seismograph
measure volcanic gases
COSPEC-Correlation Spectrometer
instruments that measure
ground deformation
EDM
any surface changes on
a volcano (subsidence/sinking, tilting, bulging);
often use of satellite imaging which
results to less exposure on the ground or safer
for volcanologists.
Ground deformation
When magma rises
up, it breaks rock along the way. Thus, earthquakes are generated. Monitoring
of quakes/tremors is done by using a
seismometer that determines which
patterns of seismic waves precede an
eruption.
Seismic activities
Monitor types, and rate of emission
Gasses
Explicit and observable by people living in nearby areas
Sensory observations
intensified presence of steam; drying up of
vegetation,wells/spring/lake; crater glow at the
mouth of the volcano
Visual
