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Journal of Earth Science

, Volume 30, Issue 5, pp 1005–1009 | Cite as

Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska

  • Chen Song
  • Qiang Yao
  • Dun WangEmail author
Seismology, Mathematical and Remote Sensing Geology
  • 26 Downloads

Abstract

We apply a novel method to estimate the magnitude of the 23 January 2018 M7.9 Alaska earth-quake using seismic stations recorded at local to regional distances in Alaska, US. We determine the source duration from back-projection results derived from the Alaska stations in a relatively compact azimuth range. Then we calculate the maximum P-wave displacements recorded on a wide azimuth range at distances of 8 to 15 degrees. Combining the source duration and the maximum P-wave displacements, we obtain magnitudes of 7.86–8.03 for the 23 January 2018 earthquake in 3–5 min, very close to the Mw 7.9 determined by the USGS and GCMT. This example validates the new approach for determining magnitude of large earthquakes using local to regional stations, and its time efficiency that magnitudes of large earthquakes can be accurately estimated within in 3–5 min after origin time. Therefore, further application of this new method would help accurate estimation of size of earthquakes that occur off shore and might cause tsunami hazards.

Key words

rapid magnitude estimation back-projection real-time seismology tsunami warning geophysics 

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Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 41474050), the Fundamental Research Funds for the Central Universities, the China University of Geosciences (Wuhan) (No. CUG170602), and the National Programme on Global Change and Air-Sea Interaction (No. GASI-GEOGE-02). Comments from Alex Hulko, Chengli Liu, and two anonymous reviewers have greatly improved the manuscript. The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1215-z.

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Copyright information

© China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Earthquake Geodesy, Institute of SeismologyChina Earthquake AdministrationWuhanChina
  2. 2.State Key Laboratory of Geological Processes and Mineral Resources, School of Earth SciencesChina University of GeosciencesWuhanChina

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