____ Focus Earthquakes Are the Most Common

Q13: The paper record of an earthquake is

Q14: Deep rocks behave as _ material under

Q15: A seismogram is a recording device that

Q16: _ are the waves of energy produced

Q17: If the measured amplitude of vibration of

Q19: For most of the 20^th century earthquake

Q20: A _ plots seismic-wave arrival time against

Q21: A _ is the first wave to

Q22: The most important concentration of earthquakes by

Q23: _ is a measure of an earthquake's