FLORENNES (BE)
Quarry blast21 January 2019
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:49:402019-01-21
- UTC
- 11:49:402019-01-21
Main parameters
| Date and time | 2019-01-21 11:49:40 UTC 2019-01-21 12:49:40 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.246° N, 4.607° E Uncertainty ± 1.0 km |
| Event ID | ROB 7670 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-21 14:56:41 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
- 9
- Epicentral distance
- 13.0 – 63.8km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.7km/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 0.37 s. S wave: 5 measurements, root-mean-square deviation 0.44 s.
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)9 stations | |||||
| MRDMaredsous | 13.0 | 61 | 11:49:42.88+2.49 s | 11:49:44.82+4.43 s | 1.94 |
| DOUDourbes | 16.8 | 183 | 11:49:43.85+3.46 s | 11:49:45.88+5.49 s | 2.03 |
| GESGesves | 37.5 | 65 | 11:49:47.22+6.83 s | 11:49:51.89+11.50 s | 4.67 |
| BRQBracquegnies | 42.5 | 308 | 11:49:47.24+6.85 s | – | – |
| RCHRochefort | 45.4 | 103 | 11:49:48.33+7.94 s | 11:49:53.72+13.33 s | 5.39 |
| BOUBougnies | 49.8 | 289 | 11:49:48.93+8.54 s | – | – |
| CLAClavier | 53.1 | 68 | 11:49:50.27+9.88 s | 11:49:54.84+14.45 s | 4.57 |
| SKQSteenkerque | 58.4 | 320 | 11:49:50.97+10.58 s | – | – |
| UCCBUccle | 63.8 | 344 | 11:49:51.48+11.09 s | – | – |