NAMUR (BE)
Quarry blast13 January 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:29:552021-01-13
- UTC
- 13:29:552021-01-13
Main parameters
| Date and time | 2021-01-13 13:29:55 UTC 2021-01-13 14:29:55 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.488° N, 4.972° E Uncertainty ± 2.2 km |
| Event ID | ROB 11865 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-01-13 22:53:57 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
- 8
- Epicentral distance
- 14.1 – 91.8km
- Mean velocity, P wave
- 5.8km/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: 6 measurements, root-mean-square deviation 0.29 s. S wave: 6 measurements, root-mean-square deviation 0.34 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)7 stations | |||||
| GESGesves | 14.1 | 144 | 13:29:57.54+2.29 s | 13:29:59.73+4.48 s | 2.19 |
| CLAClavier | 24.7 | 108 | 13:29:59.49+4.24 s | 13:30:02.64+7.39 s | 3.15 |
| MRDMaredsous | 25.3 | 215 | 13:29:59.68+4.43 s | – | – |
| RCHRochefort | 41.2 | 154 | – | 13:30:08.11+12.86 s | – |
| DOUDourbes | 51.3 | 212 | 13:30:04.74+9.49 s | 13:30:10.55+15.30 s | 5.81 |
| MEMHMembach | 74.8 | 79 | 13:30:08.52+13.27 s | 13:30:17.42+22.17 s | 8.90 |
| KLBKalborn | 91.8 | 118 | 13:30:11.01+15.76 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.5 | 65 | – | 13:30:16.68+21.43 s | – |