FLORENNES (BE)
Quarry blast6 February 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:54:212020-02-06
- UTC
- 11:54:212020-02-06
Main parameters
| Date and time | 2020-02-06 11:54:21 UTC 2020-02-06 12:54:21 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.225° N, 4.638° E Uncertainty ± 1.3 km |
| Event ID | ROB 9260 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-06 13:37:53 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
- 11
- Epicentral distance
- 12.6 – 109.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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: 11 measurements, root-mean-square deviation 0.41 s. S wave: 7 measurements, root-mean-square deviation 0.29 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 | 12.6 | 47 | 11:54:23.18+1.45 s | 11:54:25.20+3.47 s | 2.02 |
| DOUDourbes | 14.8 | 192 | 11:54:24.17+2.44 s | 11:54:26.74+5.01 s | 2.57 |
| GESGesves | 36.6 | 61 | 11:54:28.08+6.35 s | 11:54:32.92+11.19 s | 4.84 |
| RCHRochefort | 42.8 | 100 | 11:54:29.25+7.52 s | 11:54:34.91+13.18 s | 5.66 |
| TGATangissart | 43.0 | 349 | 11:54:29.45+7.72 s | – | – |
| RQRRonquières | 51.5 | 325 | 11:54:30.27+8.54 s | – | – |
| CLAClavier | 52.0 | 65 | 11:54:30.73+9.00 s | 11:54:37.58+15.85 s | 6.85 |
| SKQSteenkerque | 61.6 | 320 | 11:54:33.34+11.61 s | – | – |
| KLBKalborn | 106.0 | 97 | 11:54:39.98+18.25 s | 11:54:53.42+31.69 s | 13.44 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 108.2 | 48 | 11:54:40.23+18.50 s | – | – |
| HGNHeimansgroeve | 109.6 | 56 | 11:54:40.49+18.76 s | 11:54:54.38+32.65 s | 13.89 |