According to the information presented in the graph, the earthquake occurred at 9:37 am.
The graph shows the relationship between the time (minutes) and the distance (km) that the P waves of an earthquake took to travel.
This graph shows two lines, a red one representing the S wave and a blue one representing the P wave.
According to this graph, the earthquake waves took about 3 minutes to travel the 2000km where they were first detected.
So the answer is 9:37 am, because at 9:40 am I had already traveled 2000 km.
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