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

We use 2000-2012 InSAR data from multiple satellites to investigate magma storage in Klauea'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 similar to 5cm prior to the 2007 intrusion and the Npau Crater area by similar to 10cm following the 2011 intrusion. For the Npau Crater area, elastic modeling suggests an inflation source at 52km 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(w)7.7 decollement 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 Klauea's rift zone.