ANDENNE (BE)
Quarry blast7 July 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:46:282021-07-07
- UTC
- 11:46:282021-07-07
Main parameters
| Date and time | 2021-07-07 11:46:28 UTC 2021-07-07 13:46:28 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.499° N, 5.003° E Uncertainty ± 1.4 km |
| Event ID | ROB 13915 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-08 10:25:45 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
- 14.0 – 90.4km
- 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: 8 measurements, root-mean-square deviation 0.38 s. S wave: 7 measurements, root-mean-square deviation 0.54 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)8 stations | |||||
| GESGesves | 14.0 | 155 | 11:46:31.14+2.34 s | 11:46:33.08+4.28 s | 1.94 |
| CLAClavier | 23.0 | 113 | 11:46:32.73+3.93 s | 11:46:36.51+7.71 s | 3.78 |
| MRDMaredsous | 27.6 | 217 | 11:46:33.54+4.74 s | 11:46:37.84+9.04 s | 4.30 |
| TGATangissart | 36.1 | 289 | 11:46:34.51+5.71 s | 11:46:39.31+10.51 s | 4.80 |
| RCHRochefort | 41.5 | 157 | 11:46:35.97+7.17 s | 11:46:42.02+13.22 s | 6.05 |
| DOUDourbes | 53.6 | 213 | 11:46:38.58+9.78 s | 11:46:45.13+16.33 s | 6.55 |
| UCCBUccle | 56.3 | 306 | 11:46:38.73+9.93 s | – | – |
| KLBKalborn | 90.4 | 119 | 11:46:45.16+16.36 s | 11:46:55.13+26.33 s | 9.97 |