Abstract
Seismological characteristics of the North Korean largest nuclear test of September 2017 have been examined using the data of the In− dian Seismological Network. Full waveform modelling of the ground motion data of Indian stations for this nuclear test shows 16% 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 com− pared to those from the Kazakistan and Nevada nuclear tests for almost similar mb. It is hypothesized that more powerful fusion pro− cess in the nuclear test could result in larger tectonic slip.
Highlights
North Korea nuclear test of 2017 at the foot of Mt
The objective of this paper is to examine the utility of the Indian broadband digital network to monitor the PRAJAPATI ET AL
The full wave form modelling results from the Indian stations showed the isotropic component as 16.7 % while the Double Couple (DC) and compensated linear vector dipole (CLVD) components were 47.5 and 35.8 % respectively. This difference is attributed to the attenuation of the higher frequencies from the source to the Indian stations
Summary
North Korea nuclear test of 2017 at the foot of Mt. Manthap in the north eastern parts of the country attracted worldwide attention because it was the largest after the CTBT mandate and claimed to be a hydrogen bomb. The seismic signals recorded on the nearby seismological stations were attributed to the main test and its non-tectonic aftershock [Liu et al, 2018], caused by the collapse of the cavity and aseismic compaction. Most of the detection methods used for underground nuclear tests are based on the seismic methods, Wang et al [2018] using synthetic aperture radar observations reported the surface displacements upto 3.5 m of divergent horizontal motion and 0.5 m of subsidence associated with the largest North Korean nuclear explosion besides sub-surface collapse and aseismic compaction of the damaged rocks of the test site. Differences in the estimates of the yield of the largest test in North Korea have been reported [IRIS report, 2017] and larger data set is needed to reconcile such results. In view of the uncertainties in the yield estimation, its variation from the Indian seismic network needs to be studied. (Figure 1, 2 and 3)
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