The Accommodation of the South Flank's Motion by the Koa‘e Fault System, Kīlauea, Hawai‘i: Insights From the June 2012 Earthquake Sequence

Shuangyu Ge, Guoqing Lin, Falk Amelung, Paul G. Okubo, Donald A. Swanson, Zhang Yunjun

Research output: Contribution to journalArticle

Abstract

The Koa‘e fault system is a prominent and complex structural element of Kīlauea Volcano, Hawai‘i. On 5 June 2012, a sequence of shallow earthquakes occurred in the central part of the Koa‘e fault system. The Interferometric Synthetic Aperture Radar (InSAR) data from multiple satellites spanning the time of the earthquake occurrence indicate a maximum of ~10-cm surface displacement above the seismic events in the Koa‘e. The Global Positioning System (GPS) data from multiple stations show that there was a slow slip event in the south flank in late May 2012. Field visits to the fault after the earthquakes revealed ground cracks. In this study, we combine the seismic, InSAR, GPS data, and field observations to investigate the characteristics of the Koa‘e fault system. We relocate the seismic events in the central part of the Koa‘e fault system, compute the focal mechanisms for the events in the June 2012 earthquake sequence, invert for a two-fault model based on the surface deformation, and discuss their relationships with the 2012 slow slip event. Based on our Coulomb stress-change calculation, we infer that the 2012 slow slip event may have triggered both the seismic events and the surface deformation and played a major role in the evolution of the Koa‘e fault system and the accommodation of the south flank's motion. Our integrated analyses are helpful to constrain the fault geometry in the Koa‘e system and to shed light on the role of Koa‘e in the structural evolution of Kīlauea.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Solid Earth
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

accommodation
Earthquakes
earthquakes
earthquake
Synthetic aperture radar
Global positioning system
slip
Global Positioning System
synthetic aperture radar
Volcanoes
GPS
Satellites
fault geometry
Cracks
stress change
radar data
focal mechanism
Geometry
volcanoes
crack

Keywords

  • Koa‘e fault system
  • Kīlauea
  • normal fault evolution
  • slow slip event

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

The Accommodation of the South Flank's Motion by the Koa‘e Fault System, Kīlauea, Hawai‘i : Insights From the June 2012 Earthquake Sequence. / Ge, Shuangyu; Lin, Guoqing; Amelung, Falk; Okubo, Paul G.; Swanson, Donald A.; Yunjun, Zhang.

In: Journal of Geophysical Research: Solid Earth, 01.01.2019.

Research output: Contribution to journalArticle

@article{7551fc1796fc4b059cde3b869fab541f,
title = "The Accommodation of the South Flank's Motion by the Koa‘e Fault System, Kīlauea, Hawai‘i: Insights From the June 2012 Earthquake Sequence",
abstract = "The Koa‘e fault system is a prominent and complex structural element of Kīlauea Volcano, Hawai‘i. On 5 June 2012, a sequence of shallow earthquakes occurred in the central part of the Koa‘e fault system. The Interferometric Synthetic Aperture Radar (InSAR) data from multiple satellites spanning the time of the earthquake occurrence indicate a maximum of ~10-cm surface displacement above the seismic events in the Koa‘e. The Global Positioning System (GPS) data from multiple stations show that there was a slow slip event in the south flank in late May 2012. Field visits to the fault after the earthquakes revealed ground cracks. In this study, we combine the seismic, InSAR, GPS data, and field observations to investigate the characteristics of the Koa‘e fault system. We relocate the seismic events in the central part of the Koa‘e fault system, compute the focal mechanisms for the events in the June 2012 earthquake sequence, invert for a two-fault model based on the surface deformation, and discuss their relationships with the 2012 slow slip event. Based on our Coulomb stress-change calculation, we infer that the 2012 slow slip event may have triggered both the seismic events and the surface deformation and played a major role in the evolution of the Koa‘e fault system and the accommodation of the south flank's motion. Our integrated analyses are helpful to constrain the fault geometry in the Koa‘e system and to shed light on the role of Koa‘e in the structural evolution of Kīlauea.",
keywords = "Koa‘e fault system, Kīlauea, normal fault evolution, slow slip event",
author = "Shuangyu Ge and Guoqing Lin and Falk Amelung and Okubo, {Paul G.} and Swanson, {Donald A.} and Zhang Yunjun",
year = "2019",
month = "1",
day = "1",
doi = "10.1029/2018JB016961",
language = "English (US)",
journal = "Journal of Geophysical Research: Oceans",
issn = "2169-9275",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - The Accommodation of the South Flank's Motion by the Koa‘e Fault System, Kīlauea, Hawai‘i

T2 - Insights From the June 2012 Earthquake Sequence

AU - Ge, Shuangyu

AU - Lin, Guoqing

AU - Amelung, Falk

AU - Okubo, Paul G.

AU - Swanson, Donald A.

AU - Yunjun, Zhang

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The Koa‘e fault system is a prominent and complex structural element of Kīlauea Volcano, Hawai‘i. On 5 June 2012, a sequence of shallow earthquakes occurred in the central part of the Koa‘e fault system. The Interferometric Synthetic Aperture Radar (InSAR) data from multiple satellites spanning the time of the earthquake occurrence indicate a maximum of ~10-cm surface displacement above the seismic events in the Koa‘e. The Global Positioning System (GPS) data from multiple stations show that there was a slow slip event in the south flank in late May 2012. Field visits to the fault after the earthquakes revealed ground cracks. In this study, we combine the seismic, InSAR, GPS data, and field observations to investigate the characteristics of the Koa‘e fault system. We relocate the seismic events in the central part of the Koa‘e fault system, compute the focal mechanisms for the events in the June 2012 earthquake sequence, invert for a two-fault model based on the surface deformation, and discuss their relationships with the 2012 slow slip event. Based on our Coulomb stress-change calculation, we infer that the 2012 slow slip event may have triggered both the seismic events and the surface deformation and played a major role in the evolution of the Koa‘e fault system and the accommodation of the south flank's motion. Our integrated analyses are helpful to constrain the fault geometry in the Koa‘e system and to shed light on the role of Koa‘e in the structural evolution of Kīlauea.

AB - The Koa‘e fault system is a prominent and complex structural element of Kīlauea Volcano, Hawai‘i. On 5 June 2012, a sequence of shallow earthquakes occurred in the central part of the Koa‘e fault system. The Interferometric Synthetic Aperture Radar (InSAR) data from multiple satellites spanning the time of the earthquake occurrence indicate a maximum of ~10-cm surface displacement above the seismic events in the Koa‘e. The Global Positioning System (GPS) data from multiple stations show that there was a slow slip event in the south flank in late May 2012. Field visits to the fault after the earthquakes revealed ground cracks. In this study, we combine the seismic, InSAR, GPS data, and field observations to investigate the characteristics of the Koa‘e fault system. We relocate the seismic events in the central part of the Koa‘e fault system, compute the focal mechanisms for the events in the June 2012 earthquake sequence, invert for a two-fault model based on the surface deformation, and discuss their relationships with the 2012 slow slip event. Based on our Coulomb stress-change calculation, we infer that the 2012 slow slip event may have triggered both the seismic events and the surface deformation and played a major role in the evolution of the Koa‘e fault system and the accommodation of the south flank's motion. Our integrated analyses are helpful to constrain the fault geometry in the Koa‘e system and to shed light on the role of Koa‘e in the structural evolution of Kīlauea.

KW - Koa‘e fault system

KW - Kīlauea

KW - normal fault evolution

KW - slow slip event

UR - http://www.scopus.com/inward/record.url?scp=85075438866&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85075438866&partnerID=8YFLogxK

U2 - 10.1029/2018JB016961

DO - 10.1029/2018JB016961

M3 - Article

AN - SCOPUS:85075438866

JO - Journal of Geophysical Research: Oceans

JF - Journal of Geophysical Research: Oceans

SN - 2169-9275

ER -