microearthquakes
Imperceptible ground shivers
Microearthquakes are seismic events too small to be felt by humans, typically measuring below 2.0 on the Richter scale.
They occur constantly around fault lines and volcanic regions, detectable only by sensitive instruments.
Geologists monitor microearthquakes to map underground fault systems and sometimes to assess whether larger earthquakes may follow.
Involuntary rhythmic shaking
- vibrationRapid oscillating movement
- shudderConvulsive trembling from fear
- joltAbrupt forceful shake
- rumbleLow rolling sound
shaking · perceptible · imperceptible · felt · unfelt · rattling · subtle · faint
Imperfections or shortcomings
- stressPressure, mental or vocal
- slippageGradual loss or decline
- fracturesBreaks in rigid material
- ruptureViolent tearing apart
creep · subduction · lithosphere · crust · hypocenter · epicenter · plate boundaries · strain
Earthquake measuring device
- seismometerDetects ground vibrations
- accelerometerDevice measuring motion forces
- sensorInput-detecting device
- monitoringOngoing observation of something
magnitude · amplitude · frequency · waveform · spectrogram · signal · data · hertz
Seismic events before mainshock
- aftershocksTremors following main earthquake
- clustersGrouped collections
- sequencesOrdered sets of elements
- triggeredCaused to activate
induced · volcanic · geothermal · injection · fracking · mining · reservoir · hydraulic fracturing
Longitudinal seismic vibrations
- S-wavesSecondary seismic vibrations
- seismogramGraph of ground vibrations
- vibrationsRapid oscillating motions
- oscillationRepeated back-and-forth movement
propagation · attenuation · velocity · reflection · refraction · body waves · surface waves · arrival time
tremor
Involuntary rhythmic shaking
rumble · shaking · perceptible · imperceptible · felt · unfelt · rattling · subtle · faint · localized
faults
Imperfections or shortcomings
rupture · creep · subduction · lithosphere · crust · hypocenter · epicenter · plate boundaries · strain · deformation
seismograph
Earthquake measuring device
- seismometerDetects ground vibrations
- accelerometerDevice measuring motion forces
- sensorInput-detecting device
monitoring · magnitude · amplitude · frequency · waveform · spectrogram · signal · data · hertz · intensity
foreshocks
Seismic events before mainshock
- aftershocksTremors following main earthquake
- clustersGrouped collections
- sequencesOrdered sets of elements
triggered · induced · volcanic · geothermal · injection · fracking · mining · reservoir · hydraulic fracturing · precursors
P-waves
Longitudinal seismic vibrations
- S-wavesSecondary seismic vibrations
- seismogramGraph of ground vibrations
- vibrationsRapid oscillating motions
oscillation · propagation · attenuation · velocity · reflection · refraction · body waves · surface waves · arrival time