Mary Lou West of Mathematical Sciences examines the chart generated from a seismograph in Richardson Hall that recorded the earthquake in Mexico City last week. The seismograph, which detects an earthquake's seismic waves, was built by Elias Ahadi '00 during his senior year. The graph shows the quake measuring 7.8. West said the tremors took 20 minutes to travel from Mexico to campus and were still strong enough to shake the second floor of Richardson Hall.