In the new york seismogram the first p wave was recorded at 9: 01 utc , utc is the international standard on which most countries base their time . at what time utc did the earthquake actually occur ?

The UTC or also known as the Coordinated Universal Time is the international standard time used by countries in regulating their time. It is similar to the GMT although the GMT is no longer defined today. UTC does not have daylight saving, so if the wave was recorded at 9:01, then the earthquake did really occur on 9:01 UTC.