Pressurized magma reservoir within the east rift zone of Ki¯lauea Volcano, Hawai'i: Evidence for relaxed stress changes from the 1975 Kalapana earthquake

Scott Baker, Falk C Amelung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We use 2000-2012 InSAR data from multiple satellites to investigate magma storage in Ki¯lauea's east rift zone (ERZ). The study period includes a surge in magma supply rate and intrusion-eruptions in 2007 and 2011. The Kupaianaha area inflated by ∼5cm prior to the 2007 intrusion and the Na¯pau Crater area by ∼10cm following the 2011 intrusion. For the Na¯pau Crater area, elastic modeling suggests an inflation source at 5±2km depth or more below sea level. The reservoir is located in the deeper section of the rift zone for which secular magma intrusion was inferred for the period following the 1975 M<inf>w</inf>7.7 décollement earthquake. Reservoir pressurization suggests that in this section of the ERZ, extensional stress changes due to the earthquake have largely been compensated for and that this section is approaching its pre-1975 state. Reservoir pressurization also puts the molten core model into question for this section of Ki¯lauea's rift zone. Key Points InSAR data provide evidence for two pressurized magma bodies in the middle ERZ The stress state has changed from extensional to compressional in the middle ERZ The Na¯pau Crater source is fed from an oceanic crustal reservoir

Original languageEnglish (US)
Pages (from-to)1758-1765
Number of pages8
JournalGeophysical Research Letters
Volume42
Issue number6
DOIs
StatePublished - Mar 28 2015

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stress change
rift zone
magma chamber
volcanoes
magma
earthquakes
volcano
intrusion
earthquake
craters
Middle East
crater
sea level
inflation
volcanic eruptions
volcanic eruption
modeling

Keywords

  • InSAR
  • Ki¯lauea
  • Na¯pau

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

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title = "Pressurized magma reservoir within the east rift zone of Ki¯lauea Volcano, Hawai'i: Evidence for relaxed stress changes from the 1975 Kalapana earthquake",
abstract = "We use 2000-2012 InSAR data from multiple satellites to investigate magma storage in Ki¯lauea's east rift zone (ERZ). The study period includes a surge in magma supply rate and intrusion-eruptions in 2007 and 2011. The Kupaianaha area inflated by ∼5cm prior to the 2007 intrusion and the Na¯pau Crater area by ∼10cm following the 2011 intrusion. For the Na¯pau Crater area, elastic modeling suggests an inflation source at 5±2km depth or more below sea level. The reservoir is located in the deeper section of the rift zone for which secular magma intrusion was inferred for the period following the 1975 Mw7.7 d{\'e}collement earthquake. Reservoir pressurization suggests that in this section of the ERZ, extensional stress changes due to the earthquake have largely been compensated for and that this section is approaching its pre-1975 state. Reservoir pressurization also puts the molten core model into question for this section of Ki¯lauea's rift zone. Key Points InSAR data provide evidence for two pressurized magma bodies in the middle ERZ The stress state has changed from extensional to compressional in the middle ERZ The Na¯pau Crater source is fed from an oceanic crustal reservoir",
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