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From the USGS glossary website.
Harmonic tremor describes continuous rhythmic earthquakes that can be detected by seimographs.
Originally posted by pynner
I still think we are about to see the birth(s) of new volcano(s)...
Rhyolite dome volcanic field, 1,415 meters elevation, 2.53 to 1.14 million years old. ... A small volcanic field of domes and flows occurs at the south end of Truckee Meadows from approximately 20 kilometers south-southwest of Reno, Nevada, to approximately 12 kilometers south-southeast of Reno, aligned along a northeasterly trend.
The source of energy for the thermal system is most probably the completely crystallized magma chamber from which the rhyolite domes were emplaced.