Summary of regional infrasound observations from the two LSECE surface explosions. For each detection, the first entry denotes the detection time and the value in parenthesis denotes the celerity (horizontal group velocity) of the arrival. The Fisher statistic (F-stat), trace velocity, and back-azimuth are computed using array processing and provide measures of signal coherence, apparent velocity and direction of arrival, respectively.
| . | Artemis . | Apollo . |
|---|---|---|
| CRP | 13:45:35 (277.8 m s−1) | 22:43:40 (288.1 m s−1) |
| F-stat: 9.8 | F-stat: 7.9 | |
| Tr. Velocity: 390 m s−1 | Tr. Velocity: 420 m s−1 | |
| Back Az: −90.4° | Back Az: −85.2° | |
| Peak Over-pressure: 0.8 Pa | Peak Over-pressure: 0.5 Pa | |
| ELG | 13:45:50 (272.8 m s−1) | 22:43:50 (285.2 m s−1) |
| F-stat: 8.1 | F-stat: 9.7 | |
| Tr. Velocity: 380 m s−1. | Tr. Velocity: 390 m s−1 | |
| Back Az: −106.2° | Back Az: −104.8° | |
| Peak Over-pressure: 0.7 Pa | Peak Over-pressure: 0.5 Pa | |
| STG | 13:49:10 (303.1 m s−1) | 22:47:40 (300.2 m s−1) |
| F-stat: 27.1 | F-stat: 35.4 | |
| Tr. Velocity: 380 m s−1 | Tr. Velocity: 380 m s−1 | |
| Back Az: −85.1° | Back Az: −86.2° | |
| Peak Over-pressure: 0.5 Pa | Peak Over-pressure: 1.6 Pa | |
| BRP | 14:10:24 (267.8 m s−1) | 23:05:55 (293.1 m s−1) |
| F-stat: 6.5 | F-stat: 4.4 | |
| Tr. Velocity: 350 m s−1 | Tr. Velocity: 390 m s−1 | |
| Back Az: −123.6° | Back Az: −111.2° | |
| Peak Over-pressure: 0.1 Pa | Peak Over-pressure: 0.3 Pa | |
| NOQ | 14:04:45 (315.0 m s−1) | 23:03:25 (311.8 m s−1) |
| F-stat: - | F-stat: 3.6 | |
| Tr. Velocity: - | Tr. Velocity: 360 m s−1 | |
| Back Az: - | Back Az: -139.1° | |
| Peak Over-pressure: 0.6 Pa | Peak Over-pressure: 1.0 Pa | |
| PSU | 13:51:30 (291.5 m s−1) | 22:49:15 (305.0 m s−1) |
| F-stat: 22.3 | F-stat: 20.4 | |
| Tr. Velocity: 320 m s−1 | Tr. Velocity: 340 m s−1 | |
| Back Az: -133.2° | Back Az: -130.2° | |
| Peak Over-pressure: 0.4 Pa | Peak Over-pressure: 0.2 Pa | |
| RHL | No Detection | 23:17:15 (294.0 m s−1) |
| F-stat: 5.1 | ||
| Tr. Velocity: 330 m s−1 | ||
| Back Az: −54.1° | ||
| Peak Over-pressure: 0.1 Pa | ||
| I57US | 13:56:00 (346.9 m s−1) | No Detection |
| F-stat: 4.9 | ||
| Tr. Velocity: 340 m s−1 | ||
| Back Az: 4.5° | ||
| Peak Over-pressure: 0.1 Pa |
| . | Artemis . | Apollo . |
|---|---|---|
| CRP | 13:45:35 (277.8 m s−1) | 22:43:40 (288.1 m s−1) |
| F-stat: 9.8 | F-stat: 7.9 | |
| Tr. Velocity: 390 m s−1 | Tr. Velocity: 420 m s−1 | |
| Back Az: −90.4° | Back Az: −85.2° | |
| Peak Over-pressure: 0.8 Pa | Peak Over-pressure: 0.5 Pa | |
| ELG | 13:45:50 (272.8 m s−1) | 22:43:50 (285.2 m s−1) |
| F-stat: 8.1 | F-stat: 9.7 | |
| Tr. Velocity: 380 m s−1. | Tr. Velocity: 390 m s−1 | |
| Back Az: −106.2° | Back Az: −104.8° | |
| Peak Over-pressure: 0.7 Pa | Peak Over-pressure: 0.5 Pa | |
| STG | 13:49:10 (303.1 m s−1) | 22:47:40 (300.2 m s−1) |
| F-stat: 27.1 | F-stat: 35.4 | |
| Tr. Velocity: 380 m s−1 | Tr. Velocity: 380 m s−1 | |
| Back Az: −85.1° | Back Az: −86.2° | |
| Peak Over-pressure: 0.5 Pa | Peak Over-pressure: 1.6 Pa | |
| BRP | 14:10:24 (267.8 m s−1) | 23:05:55 (293.1 m s−1) |
| F-stat: 6.5 | F-stat: 4.4 | |
| Tr. Velocity: 350 m s−1 | Tr. Velocity: 390 m s−1 | |
| Back Az: −123.6° | Back Az: −111.2° | |
| Peak Over-pressure: 0.1 Pa | Peak Over-pressure: 0.3 Pa | |
| NOQ | 14:04:45 (315.0 m s−1) | 23:03:25 (311.8 m s−1) |
| F-stat: - | F-stat: 3.6 | |
| Tr. Velocity: - | Tr. Velocity: 360 m s−1 | |
| Back Az: - | Back Az: -139.1° | |
| Peak Over-pressure: 0.6 Pa | Peak Over-pressure: 1.0 Pa | |
| PSU | 13:51:30 (291.5 m s−1) | 22:49:15 (305.0 m s−1) |
| F-stat: 22.3 | F-stat: 20.4 | |
| Tr. Velocity: 320 m s−1 | Tr. Velocity: 340 m s−1 | |
| Back Az: -133.2° | Back Az: -130.2° | |
| Peak Over-pressure: 0.4 Pa | Peak Over-pressure: 0.2 Pa | |
| RHL | No Detection | 23:17:15 (294.0 m s−1) |
| F-stat: 5.1 | ||
| Tr. Velocity: 330 m s−1 | ||
| Back Az: −54.1° | ||
| Peak Over-pressure: 0.1 Pa | ||
| I57US | 13:56:00 (346.9 m s−1) | No Detection |
| F-stat: 4.9 | ||
| Tr. Velocity: 340 m s−1 | ||
| Back Az: 4.5° | ||
| Peak Over-pressure: 0.1 Pa |
Summary of regional infrasound observations from the two LSECE surface explosions. For each detection, the first entry denotes the detection time and the value in parenthesis denotes the celerity (horizontal group velocity) of the arrival. The Fisher statistic (F-stat), trace velocity, and back-azimuth are computed using array processing and provide measures of signal coherence, apparent velocity and direction of arrival, respectively.
| . | Artemis . | Apollo . |
|---|---|---|
| CRP | 13:45:35 (277.8 m s−1) | 22:43:40 (288.1 m s−1) |
| F-stat: 9.8 | F-stat: 7.9 | |
| Tr. Velocity: 390 m s−1 | Tr. Velocity: 420 m s−1 | |
| Back Az: −90.4° | Back Az: −85.2° | |
| Peak Over-pressure: 0.8 Pa | Peak Over-pressure: 0.5 Pa | |
| ELG | 13:45:50 (272.8 m s−1) | 22:43:50 (285.2 m s−1) |
| F-stat: 8.1 | F-stat: 9.7 | |
| Tr. Velocity: 380 m s−1. | Tr. Velocity: 390 m s−1 | |
| Back Az: −106.2° | Back Az: −104.8° | |
| Peak Over-pressure: 0.7 Pa | Peak Over-pressure: 0.5 Pa | |
| STG | 13:49:10 (303.1 m s−1) | 22:47:40 (300.2 m s−1) |
| F-stat: 27.1 | F-stat: 35.4 | |
| Tr. Velocity: 380 m s−1 | Tr. Velocity: 380 m s−1 | |
| Back Az: −85.1° | Back Az: −86.2° | |
| Peak Over-pressure: 0.5 Pa | Peak Over-pressure: 1.6 Pa | |
| BRP | 14:10:24 (267.8 m s−1) | 23:05:55 (293.1 m s−1) |
| F-stat: 6.5 | F-stat: 4.4 | |
| Tr. Velocity: 350 m s−1 | Tr. Velocity: 390 m s−1 | |
| Back Az: −123.6° | Back Az: −111.2° | |
| Peak Over-pressure: 0.1 Pa | Peak Over-pressure: 0.3 Pa | |
| NOQ | 14:04:45 (315.0 m s−1) | 23:03:25 (311.8 m s−1) |
| F-stat: - | F-stat: 3.6 | |
| Tr. Velocity: - | Tr. Velocity: 360 m s−1 | |
| Back Az: - | Back Az: -139.1° | |
| Peak Over-pressure: 0.6 Pa | Peak Over-pressure: 1.0 Pa | |
| PSU | 13:51:30 (291.5 m s−1) | 22:49:15 (305.0 m s−1) |
| F-stat: 22.3 | F-stat: 20.4 | |
| Tr. Velocity: 320 m s−1 | Tr. Velocity: 340 m s−1 | |
| Back Az: -133.2° | Back Az: -130.2° | |
| Peak Over-pressure: 0.4 Pa | Peak Over-pressure: 0.2 Pa | |
| RHL | No Detection | 23:17:15 (294.0 m s−1) |
| F-stat: 5.1 | ||
| Tr. Velocity: 330 m s−1 | ||
| Back Az: −54.1° | ||
| Peak Over-pressure: 0.1 Pa | ||
| I57US | 13:56:00 (346.9 m s−1) | No Detection |
| F-stat: 4.9 | ||
| Tr. Velocity: 340 m s−1 | ||
| Back Az: 4.5° | ||
| Peak Over-pressure: 0.1 Pa |
| . | Artemis . | Apollo . |
|---|---|---|
| CRP | 13:45:35 (277.8 m s−1) | 22:43:40 (288.1 m s−1) |
| F-stat: 9.8 | F-stat: 7.9 | |
| Tr. Velocity: 390 m s−1 | Tr. Velocity: 420 m s−1 | |
| Back Az: −90.4° | Back Az: −85.2° | |
| Peak Over-pressure: 0.8 Pa | Peak Over-pressure: 0.5 Pa | |
| ELG | 13:45:50 (272.8 m s−1) | 22:43:50 (285.2 m s−1) |
| F-stat: 8.1 | F-stat: 9.7 | |
| Tr. Velocity: 380 m s−1. | Tr. Velocity: 390 m s−1 | |
| Back Az: −106.2° | Back Az: −104.8° | |
| Peak Over-pressure: 0.7 Pa | Peak Over-pressure: 0.5 Pa | |
| STG | 13:49:10 (303.1 m s−1) | 22:47:40 (300.2 m s−1) |
| F-stat: 27.1 | F-stat: 35.4 | |
| Tr. Velocity: 380 m s−1 | Tr. Velocity: 380 m s−1 | |
| Back Az: −85.1° | Back Az: −86.2° | |
| Peak Over-pressure: 0.5 Pa | Peak Over-pressure: 1.6 Pa | |
| BRP | 14:10:24 (267.8 m s−1) | 23:05:55 (293.1 m s−1) |
| F-stat: 6.5 | F-stat: 4.4 | |
| Tr. Velocity: 350 m s−1 | Tr. Velocity: 390 m s−1 | |
| Back Az: −123.6° | Back Az: −111.2° | |
| Peak Over-pressure: 0.1 Pa | Peak Over-pressure: 0.3 Pa | |
| NOQ | 14:04:45 (315.0 m s−1) | 23:03:25 (311.8 m s−1) |
| F-stat: - | F-stat: 3.6 | |
| Tr. Velocity: - | Tr. Velocity: 360 m s−1 | |
| Back Az: - | Back Az: -139.1° | |
| Peak Over-pressure: 0.6 Pa | Peak Over-pressure: 1.0 Pa | |
| PSU | 13:51:30 (291.5 m s−1) | 22:49:15 (305.0 m s−1) |
| F-stat: 22.3 | F-stat: 20.4 | |
| Tr. Velocity: 320 m s−1 | Tr. Velocity: 340 m s−1 | |
| Back Az: -133.2° | Back Az: -130.2° | |
| Peak Over-pressure: 0.4 Pa | Peak Over-pressure: 0.2 Pa | |
| RHL | No Detection | 23:17:15 (294.0 m s−1) |
| F-stat: 5.1 | ||
| Tr. Velocity: 330 m s−1 | ||
| Back Az: −54.1° | ||
| Peak Over-pressure: 0.1 Pa | ||
| I57US | 13:56:00 (346.9 m s−1) | No Detection |
| F-stat: 4.9 | ||
| Tr. Velocity: 340 m s−1 | ||
| Back Az: 4.5° | ||
| Peak Over-pressure: 0.1 Pa |
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