The University of Southampton
University of Southampton Institutional Repository

High 3He/4He ratios in lower East Rift Zone steaming vents precede a new phase of Kilauea 2018 eruption by 8 months

High 3He/4He ratios in lower East Rift Zone steaming vents precede a new phase of Kilauea 2018 eruption by 8 months
High 3He/4He ratios in lower East Rift Zone steaming vents precede a new phase of Kilauea 2018 eruption by 8 months

On May 1, 2018, a magnitude 5.0 earthquake heralded the collapse of the Pu’u O’o Vent on the middle East Rift Zone (ERZ) of Kilauea Volcano, active since 1983. Increased seismicity was recorded on the middle to lower ERZ from April 30 until May 2, 2018. The active lava lakes within both Pu’u O’o Vent and Halema’uma’u Crater began to drain and the summit caldera began to deflate, with the summit collapse ending on August 2, 2018 and lower ERZ eruptive lava activity ending by 4 September 2018. Herein we report on elevated 3He/4He ratios in steaming vents in the lower ERZ from samples collected in early September 2017. Gas isotopic measurements were made with a new, field-portable He isotope detector capable of sub-daily monitoring of the 3He/4He ratio. When corrected for air contamination, these values exceed those previously reported for Kilauea by nearly twofold, resembling a purer hotspot plume signature, such as those measured directly over the mantle plume at Loihi Seamount to the SE of Hawaii Island, and in older basalt flows when Kilauea and its sister Hawaiian shield volcanoes were located more directly over the plume. The discovery, which presages the eruption there by more than eight months, suggests that we either sampled a 3He/4He rich magma already in place in the lower ERZ or a shallow groundwater reservoir in the lower ERZ (Puna district) with anomalously low values of 4He relative to their 3He/4He ratio, similar to previous findings there and suggestive of a previously unknown He isotopic fractionation.

2045-2322
McMurtry, G. M.
027bcf64-d16b-4567-b00f-282e8837752a
Dasilveira, L. A.
d8752dcc-a2d8-485d-bad9-364766a258d0
Horn, E. L.
0bbfba2b-1909-4f23-900e-35e3c8688a74
DeLuze, J. R.
8f431b22-7a59-4110-ae04-306e4b6b669f
Blessing, J. E.
568d48c7-6647-4a7c-9336-b2eeba0c9cd5
McMurtry, G. M.
027bcf64-d16b-4567-b00f-282e8837752a
Dasilveira, L. A.
d8752dcc-a2d8-485d-bad9-364766a258d0
Horn, E. L.
0bbfba2b-1909-4f23-900e-35e3c8688a74
DeLuze, J. R.
8f431b22-7a59-4110-ae04-306e4b6b669f
Blessing, J. E.
568d48c7-6647-4a7c-9336-b2eeba0c9cd5

McMurtry, G. M., Dasilveira, L. A., Horn, E. L., DeLuze, J. R. and Blessing, J. E. (2019) High 3He/4He ratios in lower East Rift Zone steaming vents precede a new phase of Kilauea 2018 eruption by 8 months. Scientific Reports, 9 (1), [11860]. (doi:10.1038/s41598-019-48268-0).

Record type: Article

Abstract

On May 1, 2018, a magnitude 5.0 earthquake heralded the collapse of the Pu’u O’o Vent on the middle East Rift Zone (ERZ) of Kilauea Volcano, active since 1983. Increased seismicity was recorded on the middle to lower ERZ from April 30 until May 2, 2018. The active lava lakes within both Pu’u O’o Vent and Halema’uma’u Crater began to drain and the summit caldera began to deflate, with the summit collapse ending on August 2, 2018 and lower ERZ eruptive lava activity ending by 4 September 2018. Herein we report on elevated 3He/4He ratios in steaming vents in the lower ERZ from samples collected in early September 2017. Gas isotopic measurements were made with a new, field-portable He isotope detector capable of sub-daily monitoring of the 3He/4He ratio. When corrected for air contamination, these values exceed those previously reported for Kilauea by nearly twofold, resembling a purer hotspot plume signature, such as those measured directly over the mantle plume at Loihi Seamount to the SE of Hawaii Island, and in older basalt flows when Kilauea and its sister Hawaiian shield volcanoes were located more directly over the plume. The discovery, which presages the eruption there by more than eight months, suggests that we either sampled a 3He/4He rich magma already in place in the lower ERZ or a shallow groundwater reservoir in the lower ERZ (Puna district) with anomalously low values of 4He relative to their 3He/4He ratio, similar to previous findings there and suggestive of a previously unknown He isotopic fractionation.

Text
4He ratios - Version of Record
Available under License Creative Commons Attribution.
Download (3MB)

More information

Accepted/In Press date: 29 July 2019
Published date: 14 August 2019

Identifiers

Local EPrints ID: 433707
URI: http://eprints.soton.ac.uk/id/eprint/433707
ISSN: 2045-2322
PURE UUID: d5cd01fd-35be-40e0-8b70-e694fb658f45

Catalogue record

Date deposited: 02 Sep 2019 16:30
Last modified: 07 Oct 2020 00:17

Export record

Altmetrics

Contributors

Author: G. M. McMurtry
Author: L. A. Dasilveira
Author: E. L. Horn
Author: J. R. DeLuze
Author: J. E. Blessing

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×