CELLES (BE)
Quarry blast13 April 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:54:082021-04-13
- UTC
- 10:54:082021-04-13
Main parameters
| Date and time | 2021-04-13 10:54:08 UTC 2021-04-13 12:54:08 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.698° N, 3.392° E Uncertainty ± 5.1 km |
| Event ID | ROB 13105 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-13 14:08:24 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
- 7
- Epicentral distance
- 48.9 – 204.3km
- Mean velocity, P wave
- 5.6km/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 0.24 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | |||||
| SKQSteenkerque | 48.9 | 96 | 10:54:16.29+8.11 s | 10:54:23.00+14.82 s | 6.71 |
| BRQBracquegnies | 57.9 | 114 | 10:54:17.24+9.06 s | – | – |
| SNFSeneffe | 66.5 | 108 | 10:54:19.42+11.24 s | – | – |
| MRDMaredsous | 107.1 | 114 | 10:54:26.47+18.29 s | – | – |
| DOUDourbes | 108.7 | 128 | 10:54:26.77+18.59 s | 10:54:40.19+32.01 s | 13.42 |
| GESGesves | 125.1 | 106 | 10:54:29.39+21.21 s | 10:54:46.34+38.16 s | 16.95 |
| KLBKalborn | 204.3 | 108 | 10:54:41.34+33.16 s | – | – |