High resolution earthquake catalogs from the 2018 Kilauea eruption sequence
Dates
Publication Date
2020-01-03
Start Date
2018-04-29
End Date
2018-08-06
Citation
Shelly, D.R., and Thelen, W.A., 2020, High resolution earthquake catalogs from the 2018 Kilauea eruption sequence: U.S. Geological Survey data release, https://doi.org/10.5066/P9DMIFMW.
Summary
The 2018 Kīlauea eruption and caldera collapse generated intense cycles of seismicity tied to repeated large seismic (Mw ~5) collapse events associated with magma withdrawal from beneath the summit. To gain insight into the underlying dynamics and aid eruption response, we applied waveform-based earthquake detection and double-difference location as the eruption unfolded. Here, we augment these rapid results by grouping events based on patterns of correlation-derived phase polarities across the network. From April 29 to August 6, bracketing the eruption, we used ~2800 events cataloged by the Hawaiian Volcano Observatory to detect and precisely locate 44,000+ earthquakes. Resulting hypocentroids resolve complex, yet coherent structures, [...]
Summary
The 2018 Kīlauea eruption and caldera collapse generated intense cycles of seismicity tied to repeated large seismic (Mw ~5) collapse events associated with magma withdrawal from beneath the summit. To gain insight into the underlying dynamics and aid eruption response, we applied waveform-based earthquake detection and double-difference location as the eruption unfolded. Here, we augment these rapid results by grouping events based on patterns of correlation-derived phase polarities across the network. From April 29 to August 6, bracketing the eruption, we used ~2800 events cataloged by the Hawaiian Volcano Observatory to detect and precisely locate 44,000+ earthquakes. Resulting hypocentroids resolve complex, yet coherent structures, concentrated at shallow depths east of Halema‘uma‘u crater, beneath the eventual eastern perimeter of surface collapse. Based on a preponderance of dilatational P-wave first motions and similarities with previously inferred dike structures, we hypothesize that failure was dominated by coupled shear and crack closure.
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Related External Resources
Type: Related Primary Publication
Shelly, D. R., & Thelen, W. A. ( 2019). Anatomy of a caldera collapse: Kīlauea 2018 summit seismicity sequence in high resolution. Geophysical Research Letters, 46. https://doi.org/10.1029/2019GL085636
