What does a seismograph measure? What kind of scale is the amplitude, and what scale is the other axis on a seismograph? Explain the type A and type B seismograph waves. What do they look like and what do they mean?
I'm referring to earthquakes and volcanoes specifically.
- 2 decades agoFavorite Answer
i think the other axis is time? seismogrpah measures seismic waves and earthquakes.
- RoseLv 45 years ago
Well both but they are not really comparable. A seismograph is an instrument that measures the amount of shaking at whatever place it is. By itself it can't tell much about the strength of an earthquake because it's measurements are affected by its distance from the epicenter. The farther away the earthquake, the weaker the measurement. The Richter scale is a system for estimating the strength of an earthquake based on several different factors. One way this is done is to compare the measurements of several different seismographs which are located a different points around the earth. By noting the time that the signal reaches each instrument and the apparent strength of each signal geologists can locate the epicenter and then calculate the strength of the earthquake based size of each signal and the distance to each seismograph. So in a way the seismograph is like the yardstick and the Richter scale is like the units the yardstick is calibrated in such as inches. The Richter magnitude of an earthquake is also sometimes estimated by inspecting the aftereffects. This is important in determining the strength of an earthquake that happened before seismographs were invented.