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SUMMARY:Recent fluctuations in magma supply to Kīlauea Volcano\, Hawaiʻi
  - Michael Poland\, U.S. Geological Survey\, Hawaiian Volcano Observatory
DTSTART:20140818T150000Z
DTEND:20140818T160000Z
UID:TALK53732@talks.cam.ac.uk
CONTACT:Andy Buckley
DESCRIPTION:The rate of magma supply from the mantle to Kīlauea Volcano\,
  Hawaiʻi\, was steady throughout the second half of the 20th century\, re
 sulting in persistent\, long-lived eruptive activity.  In 2003\, however\,
  inflation of the surface\, increased lava effusion from the 1983-present 
 flank eruptive vent\, and a sudden jump in CO2 emissions signaled a more t
 han doubling in magma supply to the volcano.  By 2007\, the surge had ende
 d\, and effusion rate\, deformation\, and CO2 emissions returned to nomina
 l levels.  Over the next several years\, eruptive activity appeared to wan
 e\, although the rate of lava effusion could not be accurately quantified.
   Measurements of lava discharge from satellite-derived topographic differ
 ence maps\, available since 2011\, confirm that the eruption rate of lava 
 is now about half the long-term average\, which\, coupled with a lack of v
 olcano-wide inflation\, argues for a near halving in the magma supply rate
 .  Evidence over the last two decades thus indicates the magma supply to K
 īlauea can fluctuate on timescales of only a few years—behavior that ex
 erts a powerful control on the dynamics of hotspot volcanism in Hawaiʻi.
LOCATION: Harker 2\, Department of Earth Sciences\, Downing Street
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