SPRIMONT (BE)
Quarry blast21 May 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:00:172021-05-21
- UTC
- 12:00:172021-05-21
Main parameters
| Date and time | 2021-05-21 12:00:17 UTC 2021-05-21 14:00:17 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.481° N, 5.617° E Uncertainty ± 0.8 km |
| Event ID | ROB 13505 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-21 16:51:56 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
- 17.7 – 55.0km
- Mean velocity, P wave
- 5.6km/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: 8 measurements, root-mean-square deviation 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.30 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 | |||||
| LCHLa Chartreuse | 17.7 | 356 | 12:00:20.66+3.34 s | – | – |
| CLAClavier | 23.4 | 253 | 12:00:21.27+3.95 s | 12:00:24.56+7.24 s | 3.29 |
| HOUHouvegnez | 31.0 | 117 | 12:00:23.03+5.71 s | – | – |
| MEMHMembach | 31.3 | 63 | 12:00:23.05+5.73 s | 12:00:27.07+9.75 s | 4.02 |
| MRGMont Rigi | 32.7 | 84 | 12:00:23.03+5.71 s | 12:00:27.16+9.84 s | 4.13 |
| GESGesves | 39.1 | 254 | 12:00:24.37+7.05 s | 12:00:29.81+12.49 s | 5.44 |
| KLBKalborn | 55.0 | 140 | 12:00:27.34+10.02 s | 12:00:33.72+16.40 s | 6.38 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 38.6 | 35 | 12:00:24.61+7.29 s | – | – |