Question

which strategy do geologists use to locate the center of an earthquake?
they only analyze local data.
they collect data from seismographs.
they measure arrival times of surface waves.
they draw squares on maps for measurements.

Explanation:

Geologists use seismographs to record seismic - wave data. By analyzing data from multiple seismographs, they can triangulate the epicenter of an earthquake. Measuring arrival times of surface waves alone is not sufficient to locate the center precisely. Analyzing only local data is inaccurate, and drawing squares on maps is not a relevant method for earthquake - center location.

Answer:

They collect data from seismographs.