GERAARDSBERGEN (BE)
Quarry blast6 May 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:40:432021-05-06
- UTC
- 10:40:432021-05-06
Main parameters
| Date and time | 2021-05-06 10:40:43 UTC 2021-05-06 12:40:43 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.743° N, 3.838° E Uncertainty ± 4.5 km |
| Event ID | ROB 13330 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-07 08:29:39 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
- 13
- Epicentral distance
- 3.6 – 154.3km
- Mean velocity, P wave
- 5.4km/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: 12 measurements, root-mean-square deviation 0.48 s. S wave: 5 measurements, root-mean-square deviation 0.48 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)13 stations | |||||
| LESLessines | 3.6 | 174 | 10:40:43.60+0.42 s | 10:40:43.79+0.61 s | 0.19 |
| SKQSteenkerque | 20.0 | 121 | 10:40:46.30+3.12 s | 10:40:48.11+4.93 s | 1.81 |
| RQRRonquières | 31.3 | 119 | 10:40:48.11+4.93 s | – | – |
| UCCBUccle | 37.3 | 81 | 10:40:49.54+6.36 s | 10:40:54.21+11.03 s | 4.67 |
| BOUBougnies | 40.1 | 169 | 10:40:50.72+7.54 s | – | – |
| SNFSeneffe | 40.8 | 129 | 10:40:49.91+6.73 s | – | – |
| TGATangissart | 50.7 | 107 | 10:40:51.77+8.59 s | – | – |
| MRDMaredsous | 82.2 | 126 | 10:40:57.04+13.86 s | – | – |
| DOUDourbes | 89.9 | 143 | 10:40:58.91+15.73 s | 10:41:10.97+27.79 s | 12.06 |
| GESGesves | 97.0 | 114 | 10:41:01.66+18.48 s | – | – |
| CLAClavier | 109.8 | 109 | 10:41:02.71+19.53 s | – | – |
| RCHRochefort | 118.4 | 123 | 10:41:04.31+21.13 s | 10:41:18.55+35.37 s | 14.24 |
| MEMHMembach | 154.3 | 95 | 10:41:09.35+26.17 s | 10:41:27.98+44.80 s | 18.63 |