Seismograph
A seismograph is used to detect vibrations and motions in the Earth's crust. These tremors are usually due to friction between tectonic plates (earthquakes) or huge powerful volcanic activity. - hope that helps
You can find information about earthquakes that have happened in California on the earthquake page of the USGS website. Alternatively you can find information on the about website under the geography section which has an article about earthquakes in California.
usually you find most of the zones of earthquakes and volcanoes at a plate boundary.
If you take the past earthquakes and study them and how they were you can find out about where some future earthquakes might be then you can provide a warning for earthquakes about 10% of the time.
Seismograph.
the scale used to measure the intensity of earthquakes
A seismograph.
witchcraft
The moment magnitude scale can be used to rate earthquakes of all sizes, near or far.
Seismographs show vibrations, for earthquakes. Much tech is used to predict weather and find dangerous storms.
Vibration testing is not typically used to detect earthquakes. Earthquakes are usually detected using seismometers, which are specialized instruments designed to measure ground motion caused by seismic activity.
Magnitude