FRASNES-LEZ-ANVAING (BE)
Quarry blast14 February 2019
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:47:082019-02-14
- UTC
- 11:47:082019-02-14
Main parameters
| Date and time | 2019-02-14 11:47:08 UTC 2019-02-14 12:47:08 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.689° N, 3.533° E Uncertainty ± 1.4 km |
| Event ID | ROB 7830 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-02-14 14:21:54 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 12
- Epicentral distance
- 22.0 – 146.2km
- Mean velocity, P wave
- 6.5km/s
- Mean velocity, S wave
- 3.4km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.50 s. S wave: 4 measurements, root-mean-square deviation 0.71 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)12 stations | |||||
| LESLessines | 22.0 | 84 | 11:47:13.57+5.30 s | 11:47:17.47+9.20 s | 3.90 |
| SKQSteenkerque | 38.9 | 96 | 11:47:15.72+7.45 s | 11:47:21.73+13.46 s | 6.01 |
| BOUBougnies | 44.4 | 139 | 11:47:15.83+7.56 s | – | – |
| BRQBracquegnies | 48.6 | 118 | 11:47:16.90+8.63 s | – | – |
| RQRRonquières | 49.8 | 100 | 11:47:16.75+8.48 s | – | – |
| ZEVZevekote | 66.8 | 318 | 11:47:19.68+11.41 s | – | – |
| MRDMaredsous | 97.6 | 116 | 11:47:25.02+16.75 s | – | – |
| DOUDourbes | 100.4 | 131 | 11:47:25.12+16.85 s | 11:47:38.89+30.62 s | 13.77 |
| GESGesves | 115.2 | 106 | 11:47:28.30+20.03 s | 11:47:44.44+36.17 s | 16.14 |
| CLAClavier | 128.9 | 103 | 11:47:30.58+22.31 s | 11:47:48.57+40.30 s | 17.99 |
| RCHRochefort | 134.2 | 116 | 11:47:31.12+22.85 s | 11:47:48.08+39.81 s | 16.96 |
| LCHLa Chartreuse | 146.2 | 91 | 11:47:34.14+25.87 s | 11:47:51.43+43.16 s | 17.29 |