Hello Pascal The seismometers are sensitive enough to record any earthquake on the globe larger than about a magnitude 5, so they do show the M7.0 tectonic earthquake quite nicely. Here is more information on our webicorder displays: https://www.avo.alaska.edu/webicorders/ Thank you, cheryl -------- Pascal "Pat" Annone wrote: Why are volcanoes way out in the Aleutians recording the Anchorage Event? -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050