GRCC’s Calkins Science Center hosts a seismometer that’s part of the MIQuakes network, a group of Michigan high schools, community colleges and universities that host seismometers recording earthquake activity worldwide.
GRCC’s seismometer — GRMI — has picked up four earthquakes so far this month that were equal to or greater than magnitude 6:
On Aug. 5 at 11:46 a.m. Coordinated Universal Time, a magnitude 6.9 earthquake was generated near Pulau Lombok, Indonesia. Our seismometer recorded the earthquake 20 minutes later — the red arrow shows the arrival of the primary wave:
On Aug. 12, GRMI picked up two earthquakes — a magnitude 6.4 and 6 — both from northern Alaska. The primary waves from the Alaska earthquakes only took six minutes to arrive at the GRMI station.
Finally, on Aug. 15, a magnitude 6.6 earthquake shook the Tanaga Volcano in the Aleutian Islands and was picked up by GRMI 10 minutes later.