NAMUR (BE)
Quarry blast11 February 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:33:532021-02-11
- UTC
- 13:33:532021-02-11
Main parameters
| Date and time | 2021-02-11 13:33:53 UTC 2021-02-11 14:33:53 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.499° N, 4.961° E Uncertainty ± 1.8 km |
| Event ID | ROB 12355 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-16 13:52:49 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
- 15.6 – 93.1km
- Mean velocity, P wave
- 5.9km/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 0.33 s. S wave: 6 measurements, root-mean-square deviation 0.64 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 | |||||
| GESGesves | 15.6 | 145 | 13:33:55.99+2.25 s | 13:33:57.93+4.19 s | 1.94 |
| CLAClavier | 25.8 | 110 | 13:33:58.04+4.30 s | 13:34:01.51+7.77 s | 3.47 |
| MRDMaredsous | 25.9 | 212 | 13:33:58.55+4.81 s | 13:34:02.46+8.72 s | 3.91 |
| TGATangissart | 33.2 | 291 | 13:33:59.58+5.84 s | – | – |
| RCHRochefort | 42.7 | 154 | 13:34:00.94+7.20 s | 13:34:06.93+13.19 s | 5.99 |
| DOUDourbes | 52.0 | 210 | 13:34:03.00+9.26 s | 13:34:09.67+15.93 s | 6.67 |
| SKQSteenkerque | 64.6 | 285 | 13:34:04.50+10.76 s | – | – |
| MEMSMembach | 75.4 | 80 | 13:34:07.11+13.37 s | – | – |
| KLBKalborn | 93.1 | 118 | 13:34:09.93+16.19 s | 13:34:20.27+26.53 s | 10.34 |