At 8:29 a.m. this past Friday, November 30, a magnitude 7 earthquake sent Anchorage residents scurrying out of buildings and under desks. Six minutes later, GRCC’s seismometer picked up the primary waves that traveled from Alaska to Michigan at a speed of over 13,000 miles per hour. There are preliminary reports of damage in Alaska’s largest city and the surrounding communities. A Tsunami warning was issued and then canceled later in the day.
The image above shows GRMI’s seismic record of the magnitude 7 earthquake in Alaska on Friday morning, November 30, 2018. The two red arrows indicate arrival of the P-body wave and the surface waves.
Calkins Science Center at GRCC hosts a seismometer (GRMI) that is part of the MIQuakes network, a group of high schools, community colleges and universities in Michigan that host seismometers designed to record earthquake activity both locally and worldwide. The stations are sponsored by IRIS – Incorporated Research Institutes in Seismology and MESTA – the Michigan Earth Science Teachers Association.
If you are interested in or other earthquakes recorded by the GRCC seismometer, you can find them on the MIQuakes website.