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seismology waveform cross correlation cross correlation nuclear test monitoring chelyabinsk meteorite monitoring nuclear tests ctbto aftershocks array seismology principal component analysis economics physics idc ims income infrasound inequality monitorin economic acoustics monitoring tunguska meteorite labor force inflation unemployment detection quarry blast 3-c array seismic monitoring mine blasts catastrophic earthquakes international monitoring system earthquakes east european platform nuclear tests dprk international data centre seismic bulletin