A P wave is received at 9:50:40 pm at a seismic station 3100 km away from the epicenter. When did the earthquake occur?__________________


14. An earthquake occurred at 4:35:50 am. At what time did the S-wave arrive at a seismic station 3000 km away?____________________________


15. An earthquake occurred at 5:45:30 am. The P-wave arrived at 5:51:30 am. How far away is this seismic station?