DETECTION OF WEAK AFTERSHOCKS AT REGIONAL AND TELESEISMIC DISTANCES

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High postseismic activity is often observed in areas far beyond local and regional seismic networks. The International Monitoring System (IMS) includes dozens of highly sensitive seismic arrays, which, together with new signal processing methods, significantly lowers the threshold for event detection in both continental and oceanic zones. Monitoring the postseismic process at the DPRK “Punggye-ri” test site, located near an extinct volcano, has been ongoing for more than seven years, creating almost laboratory conditions for more accurate assessment of the parameters of explosions and their, mostly weak (ML from 2.2 to 4.0), aftershocks based on data at distances from near-regional (~400 km) to teleseismic. Application of the waveform cross-correlation method at IMS arrays allowed us to detect 61 weak events at the test site, compared to 11 published in the official bulletin of the International Data Center. The methods and results of reconstructing the parameters of the postseismic activity of the explosions at “Punggye-ri” are used in the analysis of aftershock sequences of tectonic and volcanic earthquakes in different parts of the earth using IMS data.

作者简介

V. Adushkin

Sadovsky Institute of Geosphere Dynamics

Email: adushkin@idg.chps.ras.ru
Leninsky prosp., 38, bld. 1, Moscow, 119334 Russia

I. Kitov

Sadovsky Institute of Geosphere Dynamics

Email: kitov@idg.ras.ru
Leninsky prosp., 38, bld. 1, Moscow, 119334 Russia

I. Sanina

Sadovsky Institute of Geosphere Dynamics

Email: irina@idg.ras.ru
Leninsky prosp., 38, bld. 1, Moscow, 119334 Russia

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