ANDENNE (BE)
Quarry blast25 August 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 13:45:032021-08-25
- UTC
- 11:45:032021-08-25
Main parameters
| Date and time | 2021-08-25 11:45:03 UTC 2021-08-25 13:45:03 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.490° N, 4.982° E Uncertainty ± 1.6 km |
| Event ID | ROB 14315 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-25 16:44:36 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
- 6
- Epicentral distance
- 13.9 – 66.3km
- Mean velocity, P wave
- 6.3km/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: 6 measurements, root-mean-square deviation 0.19 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)6 stations | |||||
| GESGesves | 13.9 | 148 | 11:45:06.48+3.23 s | 11:45:07.78+4.53 s | 1.30 |
| CLAClavier | 24.0 | 109 | 11:45:07.52+4.27 s | 11:45:11.14+7.89 s | 3.62 |
| MRDMaredsous | 25.9 | 216 | 11:45:08.13+4.88 s | – | – |
| RCHRochefort | 41.2 | 155 | 11:45:10.58+7.33 s | 11:45:15.21+11.96 s | 4.63 |
| DOUDourbes | 51.9 | 212 | 11:45:12.47+9.22 s | – | – |
| SKQSteenkerque | 66.3 | 286 | 11:45:14.52+11.27 s | – | – |
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