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 language | English (US) |
|---|---|
| Journal | Journal of Geophysical Research: Solid Earth |
| DOIs | |
| State | Accepted/In press - Jan 1 2019 |
Fingerprint
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 journal › Article
}
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 -