EGU22-5805, updated on 02 Jan 2023
https://doi.org/10.5194/egusphere-egu22-5805
EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Seismological investigation of Mw=7.3 Karmedec Islands (New Zealand) earthquake occurred on June 15, 2019

Martina Orlando1, Gianfranco Cianchini1, Angelo De Santis1, Loredana Perrone1, Saioa Arquero Campuzano2, Serena D'Arcangelo1,3, Domenico Di Mauro1, Dedalo Marchetti4, Alessandro Piscini1, Dario Sabbagh1, and Maurizio Soldani1
Martina Orlando et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy
  • 2Instituto de Geociencias IGEO (CSIC-UCM), 28040 Madrid, Spain
  • 3Universidad Complutense de Madrid - UCM, 28040 Madrid, Spain
  • 4College of Instrumentation and Electrical Engineering, Jilin University, 130061 Changchun, China

An Mw=7.3 earthquake occurred on June 15, 2019 in New Zealand, Kermadec Islands (30.644° S, 178.100° W, 46 km depth), in correspondence with the Tonga-Kermadec subduction zone, and was characterized by a tectonic setting of shallow reverse faulting.

We investigated the preparatory phase from a seismological point of view, focusing on the analysis of seismic data in the period between January 1, 2018 and June 14, 2019 in an area limited by the Dobrovolsky strain radius. Specifically, the data from the global United States Geological Survey (USGS) and the national New Zealand (GEONet) earthquake catalogues are used in this study.

To characterize the seismicity trend in terms of magnitude distribution variations and strain release with time, we made a two-step analysis. The first one was to calculate the magnitude of completeness (Mc), which is an important parameter when estimating b-values (Wiemer and Wyss, B. Seism. Soc. Am., 2000). After this preliminary step, we observed that the seismicity accelerated during the preparation phase of the earthquake through the Revised Accelerated Moment Release (R-AMR) method (De Santis et al., Tectonophysics, 2015).

Finally, we found that the seismological research of the preparation phase of this earthquake helped to understand, together with other observations from ground and satellite, the so-called Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) phenomena prior to the mainshock.

How to cite: Orlando, M., Cianchini, G., De Santis, A., Perrone, L., Arquero Campuzano, S., D'Arcangelo, S., Di Mauro, D., Marchetti, D., Piscini, A., Sabbagh, D., and Soldani, M.: Seismological investigation of Mw=7.3 Karmedec Islands (New Zealand) earthquake occurred on June 15, 2019, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5805, https://doi.org/10.5194/egusphere-egu22-5805, 2022.

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