Magnitude of the 23 January 2018 <i>M</i>7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska

Chen Song; Qiang Yao; Dun Wang

doi:10.1007/s12583-019-1215-z

Volume 30 Issue 5

Oct 2019

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Journal of Earth Science > 2019 > 30(5): 1005-1009.

Chen Song, Qiang Yao, Dun Wang. Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska. Journal of Earth Science, 2019, 30(5): 1005-1009. doi: 10.1007/s12583-019-1215-z

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Chen Song, Qiang Yao, Dun Wang. Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska. Journal of Earth Science, 2019, 30(5): 1005-1009. doi: 10.1007/s12583-019-1215-z

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

doi: 10.1007/s12583-019-1215-z

Chen Song^1,2,
Qiang Yao²,
Dun Wang^{2
,
,}

1.
Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

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Corresponding author: Dun Wang
Received Date: 29 Sep 2018
Accepted Date: 01 Mar 2019
Publish Date: 01 Oct 2019

Abstract

Abstract

We apply a novel method to estimate the magnitude of the 23 January 2018 M7.9 Alaska earthquake 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 M_w7.9 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 offshore and might cause tsunami hazards.
- rapid magnitude estimation,
- back-projection,
- real-time seismology,
- tsunami warning,
- geophysics

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References(23)

References

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

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