Spatiotemporal Variations of Seismic Parameters During the 2018 Kilauea East Rift Zone and Summit Activity
Abstract
Eruptions at Kilauea volcano, Hawaii have occurred near the summit caldera and the Pu`u`O`o crater on the East Rift Zone. On April 30, 2018, Pu`u`O`o crater began to collapse and the U.S. Geological Survey Hawaiian Volcano Observatory issued the official onset of eruption in Leilani Estates on May 3. Since then, increased seismicity has been observed in the summit area and along the East Rift Zone. In this study, we investigate characteristics of seismic parameters during the ongoing activity. Our data are obtained from the Incorporated Research Institutions for Seismology for about 40,000 earthquakes with the magnitude varying between 0 and 6.9 from July 2015 to July 2018. These data include phase arrivals, first-motion polarities, and waveforms and are available for all the events of interest. We first relocate all the earthquakes using phase arrivals through a previously developed three-dimensional (3-D) seismic velocity model. We then start with these 3-D relocated events with improved absolute locations to perform differential-time relative relocation to all the events in the data set. We separate the data set into two different time periods, before and after April 2018 and examine spatiotemporal variations in seismic parameters that have been proven to be associated with magmatic activity, such as seismicity rate, b-value, focal solution, stress field, and Vp/Vs ratio. Our study can help our understanding of the interactions between seismic and magmatic processes and impact our ability to monitor volcanic seismicity.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.V43J0295L
- Keywords:
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- 8499 General or miscellaneous;
- VOLCANOLOGY