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Seismographic networks measure earthquakes by their magnitude, energy release and intensity. Years ago, all magnitude scales were based on the recorded waveform lengths or the length of a seismic wave from one peak to the next. But for very large earthquakes, some magnitudes underestimated the true earthquake size.
Seismicity map of the state of Texas. The data shown on this map and listed in table 1 are for earthquakes that were originally included in a study of seismic risk in the United States (Algermissen, 1969). This data file has been recompiled and updated through 1981. Some revisions of epicenters and intensities in the original file have been ...
Apr 5, 2024 · An earthquake can also be described by its intensity, or the measure of shaking and damage caused by the quake. This map shows the seismic intensity of the estimated 4.8 magnitude earthquake that ...
- kerry.breen@paramount.com
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- News Editor
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How do seismic networks measure earthquakes?
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How are earthquake magnitudes calculated?
There are many different ways to measure different aspects of an earthquake: Magnitude is the most common measure of an earthquake's size. It is a measure of the size of the earthquake source and is the same number no matter where you are or what the shaking feels like.
The focus , also called a hypocenter of an earthquake, is the point of initial breaking or rupturing where the displacement of rocks occurs. The focus is always at some depth below the ground surface in the crust, and not at the surface. From the focus, the displacement propagates up, down, and laterally along the fault plane.
In 1979, as geologists developed more accurate techniques for measuring energy release, a new scale replaced the Richter: the moment magnitude, or MW scale, which seeks to measure the energy released by the earthquake. It’s also a logarithmic scale and comparable to Richter for small and medium quakes—a 5.0 on the Richter scale, for example ...
Apr 24, 2024 · Figure 11.3.1 11.3. 1 P-waves and S-waves from a small (M4) earthquake that took place near Vancouver Island in 1997. When body waves (P or S) reach Earth’s surface, some of their energy is transformed into surface waves, of which there are two main types, as illustrated in Figure 11.3.2 11.3. 2.
