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Periodic dike intrusions at Kilauea Volcano, Hawai'i

Emily K. Montgomery-Brown and Asta Miklius
Periodic dike intrusions at Kilauea Volcano, Hawai'i
Geology (Boulder) (December 2020) 49 (4): 397-401

Abstract

Forecasting heightened magmatic activity is key to assessing and mitigating global volcanic hazards, including eruptions from lateral rift zones at basaltic volcanoes. At Kilauea volcano, Hawai'i (United States), planar dikes intrude its east rift zone (ERZ) and repeatedly affect the same segments. Here we show that Kilauea's upper and middle ERZ dikes in the last four decades intruded at regular intervals of approximately 8 or approximately 14 yr. Segments with shorter recurrence intervals are adjacent to faster-moving parts of the flank, and approximately 1-5 MPa of tension accumulates from flank spreading in the time between dike events. Intrusion frequency was neither advanced nor delayed during magma supply variations, supporting the role of long-term flank motion on the timing of dike intrusions. Although fewer historical dikes have occurred near the 2018 CE eruption site in the lower ERZ and the adjacent slowly sliding lower eastern flank, similar tension accumulated between the 1955 and 2018 eruptions. Regular dike intrusion recurrence intervals indicate the importance of including both extrusive and (commonly neglected) intrusive activity in eruption hazard analyses.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 49
Serial Issue: 4
Title: Periodic dike intrusions at Kilauea Volcano, Hawai'i
Affiliation: U. S. Geological Survey, Cascades Volcano Observatory, Vancouver, WA, United States
Pages: 397-401
Published: 20201210
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 45
Accession Number: 2021-010112
Categories: Igneous and metamorphic petrologyQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N19°15'00" - N19°25'00", W155°19'60" - W155°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202107
Program Name: USGSOPNon-USGS publications with USGS authors
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