The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Mammoth Mountain is a lava-dome complex on the SW rim of Long Valley caldera, California. Despite its close geographic relation, it is believed that it has its own magma chamber different from the ones underlying Long Valley caldera and the Inyo craters.
Number of earthquakes in the Long Valley caldera over the 30 days, showing the recent swarm (USGS)
An small earthquake swarm at shallow depths (around 5 km) occurred east of Mammoth Mountain during the past week. The largest quake was a magnitude 3.0 event on 5 Feb. ...more
This latest (of many in the past years) seismic swarm is weak in terms of number and energy of earthquakes compared to long-term averages of seismic activity at the Long Valley caldera, an active volcanic system that is capable to erupt (probably not in a near future, though) and is being closely monitored by very experienced staff from USGS. It could be related to a small intrusion of magma, but is unlikely to be a precursor of a new eruption in any near future. USGS has not changed the status code of the volcanic system (at green=normal). [less]
Time and depth of quakes near Mammoth Mountain during the past days
Another small earthquake swarm has occurred between 14-16 Nov. Such seismic activity falls into the normal behaviour of an active caldera system, and should not be seen as indicator of new eruptions to be expected in the near future. USGS who monitor their volcanoes very carefully maintain alert level green (normal) for Long Valley and Mammoth Mountain.
Another small seismic swarm has occurred (or started) yesterday near Mammoth Mountain, with about 20 very small quakes located at about 6 km east of the volcano at depths mostly between 10 and 5 km. A larger magnitude 2.9 event at 13.5 km followed this morning (GMT time). ...more
According to Earthquake-Report, the recently elevated seismicity in the area may be related to / have been energized by the large M7.7 Haida Gwaii earthquake west of British Colombia, Canada, on 28 Oct.
Location of quakes in the past days aat Mammoth Mountain
Time and depth of quakes under Mammoth Mountain during the past week
A stronger than usual seismic swarm was recorded beneath Mammoth Mountain volcano in California during 29 October. The swarm, in such not uncommon, was accompanied by slight deformation ...more
(extension) across the volcano. Such deep low-frequency events occur in the middle to lower crust and are believed to be caused by the transit of magma or magmatic fluids upward beneath volcanoes. Such episodes at Mammoth may be followed (within days to weeks) by shallow earthquake swarms. [less]
Volcano Calendar 2016: We're proud to present our new volcano calendar 2016: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
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