Crustal Structure of the Laguna Del Maule Volcanic Field Using Receiver Functions
The Laguna del Maule (LdM) volcanic field in central Chile has had considerable postglacial rhyolitic eruptions supplied by a shallow, crustal magma reservoir. Today, this reservoir is characterized by extensive seismicity and periods of inflation. Geophysical studies have shown there is a low density, high conductivity, low seismic velocity anomaly inferred to contain partial melting up to 14%. Geodetics and seismicity studies also show the likely source of inflation and seismicity coincides with the low velocity anomaly, implying active recharge from a deeper source. While the presence of an upper crustal magma reservoir is consistent in prior geophysical imaging, questions remain regarding the detailed geometry of the reservoir and how it fits within the transcrustal magmatic system feeding LdM. Using seismic stations deployed between 2015-2018, we conduct receiver function analysis to get better constraints on the detailed crustal structure below LdM. Preliminary results show there is heterogeneity across the LdM volcanic field and a weak Moho. There are several strong mid-crustal conversions that are spatially limited. These mid-crustal conversions may indicate a more complex upper-mid crustal reservoir system. A weak moho signature may imply a weak or gradual structural crust-mantle transition.
Session: Seismoacoustic, Geodetic and Other Geophysical Investigations of Active Volcanoes [Poster Session]
Type: Poster
Room: Exhibit Hall
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Sarah Nolt-Caraway
Student Presenter: Yes
Additional Authors
Sarah Nolt-Caraway Presenting Author Corresponding Author san264@nau.edu New Mexico Institute of Mining and Technology |
Daniel Portner daniel.portner@nmt.edu New Mexico Institute of Mining and Technology |
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Crustal Structure of the Laguna Del Maule Volcanic Field Using Receiver Functions
Session
Seismoacoustic, Geodetic and Other Geophysical Investigations of Active Volcanoes
Description