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- Interpretation of seismograms is devoted to the art of identification of various types of seismic waves (phases) that appear on seismograms and often generate a rather complex structure. Correct identification of recorded phases with respect to travel paths through the Earth is the doorway to any research using observational seismic data.
www.sciencedirect.com › science › articleThe Structure and Interpretation of Seismograms - ScienceDirect
A seismogram is the recording of the ground shaking at the specific location of the instrument. On a seismogram, the HORIZONTAL axis = time (measured in seconds) and the VERTICAL axis= ground displacement (usually measured in millimeters).
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- What Is A Drum Recorder?
- How to Read The Display
- Interpretation
- How The Data Channels Are Named
Drum recorders, like the ones pictured here, draw a seismogram on a piece of paper wrapped around a slowly revolving drum. As the drum revolves, the pen shifts across it, making a big spiral or helical record that eventually fills the entire page. When the paper is removed and laid flat, the record appears to be many horizontal lines, like lines in...
The seismograms displayed are from a few of the seismograph stations routinely recorded by the Northern California Seismograph Network. Each is a record of how the ground moved at a particular seismograph station in Northern California during a 24-hour period. The plots are "magnified" according to the level of background or ambient seismic noise, ...
When an earthquake occurs the seismogram will show ground motions that typically last from several tens of seconds to many minutes, depending on the size of the earthquake and the sensitivity of the seismograph. The height of the recorded waves on the seismogram (wave amplitude) is a greatly magnified representation of the actual ground motion. A r...
Each data channel has a three part name such as MSL VHZ NC. The first part identifies the station. The middle part describes the data. The last part identifies the seismic network. The station name and network uniquely identify the location where the data are being recorded. The data descriptor tells a) what is being measured (velocity, displacemen...
A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time. Seismograms typically record motions in three cartesian axes (x, y, and z), with the z axis perpendicular to the Earth's surface and the x- and y- axes parallel to the surface.
Aug 14, 2024 · seismograph, instrument that makes a record of seismic waves caused by an earthquake, explosion, or other Earth -shaking phenomenon. Seismographs are equipped with electromagnetic sensors that translate ground motions into electrical changes, which are processed and recorded by the instruments’ analog or digital circuits.
- The Editors of Encyclopaedia Britannica
Jan 1, 2021 · Seismogram interpretation, described in this article, is essentially devoted to the art of identification of various seismic “arrivals” or wave types visible on seismograms.
Seismographs in exposed areas, especially along the West Coast, will detect vibrations in the ground caused by high winds. These instruments are sensitive to even the most minute vibrations, and are able to detect signals from earthquakes occuring thousands of kilometres away.
Ever wondered how to read the data on a seismogram? This playful animation created for the general public by the USGS describes what a seismogram is, how they are recorded and what to look for in the seismic traces recorded on a seismometer.
