SPRIMONT (BE)
Quarry blast23 February 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 13:33:272021-02-23
- UTC
- 12:33:272021-02-23
Main parameters
| Date and time | 2021-02-23 12:33:27 UTC 2021-02-23 13:33:27 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.520° N, 5.650° E Uncertainty ± 3.0 km |
| Event ID | ROB 12435 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-23 14:19:10 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
- 13.7 – 31.9km
- Mean velocity, P wave
- 6.8km/s
- Mean velocity, S wave
- 3.5km/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 0.11 s. S wave: 4 measurements, root-mean-square deviation 0.09 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)4 stations | |||||
| LCHLa Chartreuse | 13.7 | 345 | 12:33:30.83+2.98 s | 12:33:32.43+4.58 s | 1.60 |
| MEMSMembach | 27.4 | 69 | 12:33:32.78+4.93 s | 12:33:36.39+8.54 s | 3.61 |
| MEMHMembach | 27.4 | 69 | 12:33:32.82+4.97 s | 12:33:36.52+8.67 s | 3.70 |
| EBNEben-Emael | 30.8 | 4 | 12:33:33.27+5.42 s | 12:33:37.49+9.64 s | 4.22 |
| Dutch seismic network (KNMI)1 station | |||||
| TERZTerziet | 31.9 | 35 | 12:33:33.20+5.35 s | – | – |