Signals from four large earthquakes are embedded in the seismogram (northeast Ohio, USA) displayed above. They are
Time Magnitude Location
20:52:13, Oct 7 5.9 East of Severnaya Zemlya
21:41:14, Oct 7 6.7 Celebes Sea
22:03:15, Oct 7 7.8 Vanuatu
23:13:49, Oct 7 7.1 Vanuatu
A quick look at the extracted signals clearly shows the Russian surface waves. I think the 7.8 magnitude signal probably obliterates the one from the Celebes Sea which was quite deep and therefore lacking significant surface waves. The surface waves from the second Vanuatu earthquake are visible. Aside from the Celebes Sea earthquake the other three were relatively shallow.
The USGS just added another one: Magnitude 7.7 – SANTA CRUZ ISLANDS at 22:18:26 UTC