The CURRENT CONDITION is GREEN
(background activity within the caldera posing no Immediate Risk
for volcanic activity in the area). Last updated at 6:30 AM
(PDT) on July 6, 2001. See Response Plan
for information on conditions, activity levels, and the Long
Valley caldera response plan.
Seismic trend:
Earthquake activity within and adjacent to the
caldera has remained low since mid-1999 averaging just
five to 10 earthquakes per day with magnitudes less
than M=2 and an occasional event as large as M=3;
see details
.
Deformation trend:
The resurgent dome has shown small fluctuations about an overall
trend characterized by minor subsidence since early 1999.
The center of the resurgent dome remains roughly 80 cm
higher than in the late 1970's;
see details
.
CO2 trend:
The diffuse carbon dioxide gas flux in the Horseshoe
Lake tree-kill area
has shown little change from the relatively high
levels of 50 to 150 tons per day sustained for the
past several years; see
details.
Updated at 6:30 AM (PDT) on July 6, 2001:
The realtime computer system detected and located fewer than five small earthquakes in Long Valley caldera and vicinity since the last update at 9:10 AM (PDT) on Thursday, July 5. None had magnitudes as large as M=2.0.
Updated at 9:10 AM (PDT) on July 5, 2001:
The realtime computer system detected and located fewer than five small earthquakes in Long Valley caldera and vicinity since the last update at 8:55 AM (PDT) on Wedensday, July 4. None had magnitudes as large as M=2.0.
Updated at 8:55 AM (PDT) on July 4, 2001:
The realtime computer system detected and located six small earthquakes in Long Valley caldera and vicinity since the last update at 9:25 AM (PDT) on Tuesday, July 3. None had magnitudes as large as M=2.0.
Updated at 9:25 AM (PDT) on July 3, 2001:
The realtime computer system detected and located seven small earthquakes in Long Valley caldera and vicinity since the last update at 9:05 AM (PDT) on Monday, July 2. The largest was a M=2.2 earthquake at 6:46 AM on the 3rd located in the Sierra Nevada 7 miles WSW of Tom's Place.
Updated at 9:05 AM (PDT) on July 2, 2001:
The realtime computer system detected and located fewer than five small earthquakes in Long Valley caldera and vicinity since the last update at 9:20 AM (PDT) on Sunday, July 1. None had magnitudes as large as M=2.0.
