  Mammoth Lakes Region: Aftershocks
continued to dominate the region following the Hilton Creek M5.1 earthquake
on June 8. The intensity of activity was much reduced this week, as only
one of the 204 temblors registered in the M3 range.
- Pulses and pauses of seismicity occurred
through the week yet the daily totals remained at the 20-40 eq/day level.
Peak activity occurred on June 29 with 41 eq/day and the fewest number
happened the previous day with 21 eq/day. The strongest aftershock measured
M2.9 and occurred the morning of July 2.
- The largest earthquake was not an Hilton
Creek aftershock. The M3.0 temblor occurred June 28 in the Sierra Nevada
Mountains south of Mammoth Lakes, near the Silver Divide. It was centered
in the same location as four M3's recorded there last week.
- Activity in the Long Valley caldera remained
relaxed. The only significant action was a cluster of M1's near the Mammoth
Airfield (Largest: M1.7).
- Regional Activity: On July 1st, at 8:39 p.m.,
a M4.9 earthquake struck the CA/NV border region in northern Death Valley
National Monument, near Scottys Castle.
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The USGS Volcanic Unrest Status is currently
GREEN indicating weak to moderate unrest,
posing no immediate risk. (more)
- For more information on the Long Valley caldera and other volcanoes
around the world, please see the following web sites:
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