FLORENNES (BE)
Quarry blast18 November 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:50:342020-11-18
- UTC
- 12:50:342020-11-18
Main parameters
| Date and time | 2020-11-18 12:50:34 UTC 2020-11-18 13:50:34 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.220° N, 4.556° E Uncertainty ± 1.7 km |
| Event ID | ROB 11340 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-11-19 07:59:05 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
- 5
- Epicentral distance
- 14.2 – 58.5km
- Mean velocity, P wave
- 5.7km/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: 5 measurements, root-mean-square deviation 0.25 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)5 stations | |||||
| DOUDourbes | 14.2 | 169 | 12:50:37.38+2.53 s | 12:50:39.92+5.07 s | 2.54 |
| MRDMaredsous | 17.7 | 59 | 12:50:38.04+3.19 s | – | – |
| GESGesves | 42.1 | 64 | 12:50:42.85+8.00 s | – | – |
| RCHRochefort | 48.5 | 98 | 12:50:43.46+8.61 s | 12:50:49.38+14.53 s | 5.92 |
| SKQSteenkerque | 58.5 | 325 | 12:50:44.97+10.12 s | – | – |
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