Dragon jar
A type of geophysicist known as a seismologist measures the strength of earthquakes.
If for ancient China, (i am assuming because you said did) it is seismograph
The Richter scale is used to rate the magnitude of an earthquake -- the amount of energy it released
The "Dragon Jar" was invented by Zhang Heng, an inventer of Han Dynasty more than 1000 years ago. It could measure if an earthquake occurred and in which direction.
An earthquakes intensity
The strength of earthquakes
magnitude
A seismograph.
A seismograph is a device that measures the strength of an earthquake.
the seismograph
they used a seismograph
A seismograph is an instrument used to measure the strength of earthquakes.
The Richter scale and Magnitude
yes it is
used to measure the strength of earthquakes?
intensity
A type of geophysicist known as a seismologist measures the strength of earthquakes.