Question

1. what instrument is used to study and locate an earthquake?

quake meter

epicenter meter

richter meter

seismometer

Explanation:

A seismometer is the instrument designed to detect, record, and help locate seismic waves produced by earthquakes. The other options are incorrect: "quake meter" and "epicenter meter" are not standard scientific terms for this purpose, while the Richter scale is a measurement of earthquake magnitude, not an instrument.

Answer:

seismometer