[per loin]

Mammoth is about half way down California, near its eastern border. Mammoth became very active,seismicly, coincident with the blowing of St Helens. Same day as the second eruption, as memory has it.

[Mike Darancette]

Mammoth became very active,seismicly, coincident with the blowing of St Helens. Same day as the second eruption, as memory has it.

Good memory, the recent festivities at Mammoth began as follows:

In May of 1980, a strong earthquake swarm that included four magnitude 6 earthquakes struck the southern margin of Long Valley Caldera associated with a 25-cm, dome-shaped uplift of the caldera floor. These events marked the onset of the latest period of caldera unrest that continues to this day. This ongoing unrest includes recurring earthquake swarms and continued dome-shaped uplift of the central section of the caldera (the resurgent dome) accompanied by changes in thermal springs and gas emissions.
-USGS

My brother was fishing on Convict Lake and bugged out after the 2nd magnitude 6 quake hit.

The USGS and the locals took the threat so seriously that they had an escape road built, which they, of course called the "Scenic Loop". What I can't understand is why the "Scenic Route" passes within an easy walk of the Inyo Craters which are the most recently active features in the area (around 600 years ago).

The current activity at Mt. Hood is minor compared to 1980 Mammoth.