Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests
| Autor: | William R. Walter, Sean R. Ford, Gene A. Ichinose, S. C. Myers, Michael E. Pasyanos |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Meteorology Isotropy Phase (waves) 010502 geochemistry & geophysics Geodesy 01 natural sciences Differential phase Amplitude ratio Geophysics Amplitude Surface wave General Earth and Planetary Sciences Relative phase Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 44:8857-8864 |
| ISSN: | 0094-8276 |
| DOI: | 10.1002/2017gl074577 |
| Popis: | We performed relative locations of six event-pairs based on surface-wave (SW) and body-wave (BW) differential travel-times of the 2016-09-09, 2016-01-06, 2013-02-12, and 2009-05-25 announced North Korea nuclear explosions. The SW relative locations for the 2009-05-25 and 2013-02-12 events were inconsistent with the BWs when paired with other events and only the 2016-01-06/2016-09-09 pair was consistent. Apparent SW phase shift is investigated with respect to the BW relative locations. The pairs formed with the 2009-05-25 and 2013-02-12 events, beneath the southeast slope of Mount Mant'ap, have the largest phase shifts and amplitude ratio deviations, whereas the least deviation was from the 2016-01-06 and 2016-09-09 event-pair beneath the mountain peak. Regional moment tensors (MTs) predict the amplitude ratios but do not resolve the relative phase. We find MTs with 10% difference in isotropic and rotated +CLVD can fit both relative phase and amplitude ratios. SW relative locations of highly isotropic and correlated explosion clusters can be affected by topography and small differences in MT. |
| Databáze: | OpenAIRE |
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