Take a look at this real data collected by a seismograph on May 27, 2020. Each row of the data represents a 15-minute span of time, beginning at 6:00 p. m. 23 lines, mostly straight with small bumps; many large spikes begin in the fourth minute of data on the 14th line and last for about two minutes

Describe the appearance of the data from the seismograph. At approximately what time did the largest earthquake occur?