They use an interferometer. It can determine distance down to 1/2 wavelenght of light which is pretty small. The sent and returned light is compared. You said where, the answer is how.
Yes, laser ranging devices are highly sensitive instruments that can detect small movements in the Earth's crust. By measuring changes in distance with high precision, these devices can detect even subtle ground deformations caused by tectonic activities or other geological processes. This capability makes laser ranging valuable for monitoring and studying seismic events and crustal movements.
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Laser-ranging devices are highly sensitive and precise instruments that can detect even subtle movements of the crust along fault lines or tectonic plate boundaries. They work by measuring the distance between the instrument and a target point with high accuracy, allowing scientists to monitor changes in the Earth's crust and potentially predict earthquakes or volcanic activity. This technology plays a crucial role in understanding and monitoring geologic hazards.
They use an interferometer. It can determine distance down to 1/2 wavelenght of light which is pretty small. The sent and returned light is compared. You said where, the answer is how.
Tiltmeters measure very small changes in slope or tilt of the ground. Creep meters monitor slow movements in the Earth's crust. Laser-ranging devices use lasers to measure distances with high precision. GPS devices use satellite signals to determine location and movement on Earth's surface.
it comes from the crust
Tectonics.
Plate Techtonics.
Seismographs do not record air movements caused by seismic waves. Seismographs specifically detect and record ground movements, such as vibrations or oscillations in the Earth's crust, produced by seismic waves generated by earthquakes or other sources. The air movements caused by seismic waves do not directly influence the seismograph readings.
seismograph
Plate tectonics.
Tectonics.