Answers

2014-12-12T21:14:55+08:00
Measuring and recording of ground motion were combined than to modern systems, in which these functions are separated.
1 5 1
2014-12-12T21:17:23+08:00
It is an instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.
3 5 3
Seismology actually refers to the study and the science of Earthquakes.