Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Seismograms contain a lot of information about an earthquake: its strength, length and distance. Wave height used to determine the magnitude of the earthquake. The seismogram shows the different arrival times of the seismic waves ( Figure below ). The first waves are P-waves since they are the fastest. S-waves come in next and are usually larger than P-waves. The surface waves arrive just after the S-waves. If the earthquake has a shallow focus, the surface waves are the largest ones recorded. Answer: strength, length and distance
Solution:
What three parameters do seismographs measure?