[Folda] Fwd: Friday Seminar - 25th August - Sigurjón Jónsson: One or two magma chambers under Galápagos?==?utf-8?q? calderas?

[Siqi Li]

-------- Original Message -------- 
Subject: Friday Seminar - 25th August - Sigurjón Jónsson: One or two magma chambers under Galápagos calderas? 
Date: Tuesday, August 22, 2017 10:31 GMT 
From: Maxwell Christopher Brown <maxwell at hi.is> 
To: Maxwell Christopher Brown <maxwell at hi.is> 
 
 
Dear graduate students,

This Friday is the first seminar of the new academic year.  We start with:

Sigurjón Jónsson (professor of geophysics, KAUST - King Abdullah 
University of Science and Technology)

Title: One or two magma chambers under Galápagos calderas?

Abstract: Several recent studies focusing on Galápagos volcanoes have 
reported co-eruption deflation consisting of focused intra-caldera 
subsidence superimposed on wider and weaker deflation signals. These 
coupled subsidence patterns have been modeled using pressure decrease in 
two magma reservoirs located at different depths. Here we explore 
whether these observations can be explained with a different type of 
models consisting of a single reservoir interacting with the caldera 
ring fault. We first report on the recent 2015 Wolf eruption in the 
Galápagos that shows some of the same characteristics seen earlier at 
other Galápagos volcanoes. We then use both analogue sandbox experiments 
and numerical modeling to study processes involved from initial 
subsidence to later collapse of calderas, compare the results to the 
observations, and discuss which class of models more likely represents 
the structure under the volcanoes.

Date: Friday, 25th August
Time: 12:30
Place: 3rd Floor meeting room, Askja

All are welcome.
Best wishes
Maxwell

-- 
Maxwell Brown
Research specialist
Institute of Earth Sciences
University of Iceland
Askja, Room 333
Sturlugata 7
101 Reykjavík
Iceland
  
email:maxwell at hi.is
tel (office): +354-525-4730
tel (lab): +354-525-4794
tel (mobile): +354-832-0015