Don (and anyone else wishing to make a stab at it)., what do you make of the
sudden change in the magnetics at Long Valley over the past day - this is
associated with a minor swarm of earthquakes and with the Ml 2.4 today -
is the subterranean magma moving, and could we be in for renewed activity
in this area? What do you think?
The magnetic data is found at:
http://quake.wr.usgs.gov/research/deformation/data/mam.mag.gif

P.S. Normally I don't pay much attention to this magnetic data as it usually
simply mirrors the variations in the geomagnetic field. But right now, the
geomagnetic field is extremely quiet, so this is indeed an anomaly that
may be related to magma movement.

• Mammoth Lakes Magnetic data graph