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Moment Tensor Inversions for Rapid Seismic Source Detection and Characterization of the North Korean Nuclear Tests

Description: 

The rapid detection and source characterization of any type of seismic events including earthquakes and nuclear explosions are two important missions of many monitoring seismological laboratories. Here, we extend the use of a technique already considered for earthquake monitoring in tectonically active regions to identify non-double-couple shallow events. This approach allows the rapid screening of such events. It can then be implemented in near real-time procedures and it can become the core of an easy-to-use interactive tool for seismic analysts. This rapid detector of seismic events provides the full information of the sources (origin time, location, magnitude, mechanism, and source decomposition) from full moment tensor inversions calculated on a grid of virtual sources distributed over a region of interest with a limited set of stations. Its overall performances on all past Democratic People’s Republic of Korea (DPRK) nuclear tests and regional earthquakes are presented. This work also allows to confirm the nature of the first DPRK explosion in 2006 despite the low signal to noise ratio observed in the seismic data, as well as the characterization of the collapse in the Mantap mountain after the 2017 nuclear test. These rapid source parameters (location, magnitude, mechanism) are comparable to those derived from high-frequency data and more complete set of regional and teleseismic stations. Thanks to this designed tool rapid (i.e., within a few minutes) and complete event screening is possible and it opens numerous options for earthquake and explosion monitoring as well as for tsunami warning.

Session: Advancements in Forensic Seismology and Explosion Monitoring [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Aurelie

Student Presenter: No

Invited Presentation: 

Authors