What do seismologisits use to measure earthquakes strength?

Seismologists use seismometers or seismographs to measure the strength of earthquakes. These instruments detect and record the vibrations caused by seismic waves as they travel through the Earth. The data collected allows scientists to determine the earthquake's magnitude, typically using scales such as the Richter scale or the Moment Magnitude scale (Mw). By analyzing these measurements, seismologists can assess the earthquake's intensity and potential impact.