1/ What is the arrival time of the 1 st P waves for the Pinyon Flats seismic station? ___________ seconds 2/ What is the arrival time of the 1 st S waves for the Pinyon Flats seismic station? ___________ seconds 3/ What is the time difference between arrival of the first P and first S-waves at Pinyon Flats? _________ seconds 4/ What is the arrival time of the 1 st P waves for the Yuma seismic station? ___________ seconds 5/ What is the arrival time of the 1 st S waves for the Yuma seismic station? ___________ seconds 6/ What is the time difference between arrival of the first P and first S-waves at Yuma? _________ seconds.