The 12 February 2013 North Korean Underground Nuclear Test
| Autor: | Lian-Feng Zhao, Wei-Min Wang, Xiao-Bi Xie, Zhenxing Yao |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Seismological Research Letters. 85:130-134 |
| ISSN: | 1938-2057 0895-0695 |
| Popis: | Online Material: Figures of Pn waveform comparisons and spectral ratios; tables of Pn differential times and parameters for events used in the study. On 12 February 2013, North Korea conducted its third and the largest nuclear test to date in the China–North Korea border area. According to local news, people living in nearby Chinese cities experienced shaking from this explosion. The U.S. Geological Survey (USGS) reported the explosion was located at (41.301° N, 129.066° E) and the magnitude was M 5.1. This event trigged abundant regional seismic phases in northeast China, Korea, and Japan. Because of its large magnitude, the seismic records from this event showed better signal‐to‐noise ratios than those from previous two nuclear explosions. Illustrated in Figure 1 are broadband regional seismograms at station MDJ for three North Korea nuclear tests. These waveforms are highly similar, all are featured with abrupt P ‐wave arrivals, weak Lg phases and well‐developed short‐period Rayleigh waves. We collect the regional waveforms recorded on China National Digital Seismic Network (CNDSN), Global Seismic Network (GSN), and Japan F‐net to investigate the 12 February 2013 North Korean nuclear test. Figure 1. Seismograms recorded on MDJ from three North Korean nuclear tests in 2013, 2009, and 2006. Illustrated are normalized vertical displacements. The event date, maximum amplitudes, and epicenter distances are listed on the left. Marks on the waveforms indicate apparent group velocities. Note that the waveforms show similar features and display clear impulsive P ‐wave onset, relatively weak Lg phases, and 3–5 s period Rayleigh waves. ### High‐Precision Location By adopting the relative location method (e.g., Schaff and Richards, 2004; Zhang et al. , 2005; Wen and Long, 2010; Murphy et al. , 2013), and using the first North Korean nuclear test on 9 October 2006 as the master event, we calculate the origin times and locations of the 25 May 2009 and … |
| Databáze: | OpenAIRE |
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