Monitoring the largest North Korean nuclear explosion 2017, through Indian Seismological Network

SANJAY KUMAR PRAJAPATI, Rajesh Rajesh Prakash, H. N. Srivastava

Abstract


Seismological characteristics of the North Korean largest nuclear test of September 2017 have been examined using the data ofthe Indian Seismological Network. Full waveform modelling of the  ground motion data of Indian stations for this nuclear test shows16% isotropic component, 47.5 % DC and 35.8 % CLVD components. The Indian stations being located about 3500 to 5000 km away from the source, gave   lesser isotropic component as compared to that from the nearby stations around the North Korean test site. This is attributed to the  rapid attenuation of the high frequencies emitted from the source.  Its average body wave magnitude, mb from the Indian stations broadly agrees with that reported by worldwide data. It was found that the surface wave magnitude of this test in North Korea was large as compared to those from the Kazakistan and Nevada nuclear tests for almost similar mb. It is hypothesized that more powerful fusion process in the nuclear test could result in larger tectonic slip   supported by larger surface wave magnitude and its double couple component.

 


Keywords


North Korea nuclear test 2017, mb versus Ms, source mechanism, waveform modelling

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References


DOI: https://doi.org/10.4401/ag-8026
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X