ANDENNE (BE)
Quarry blast19 August 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:48:472021-08-19
- UTC
- 11:48:472021-08-19
Main parameters
| Date and time | 2021-08-19 11:48:47 UTC 2021-08-19 13:48:47 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.456° N, 4.982° E Uncertainty ± 1.3 km |
| Event ID | ROB 14280 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-20 11:49:51 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
- 10.8 – 89.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.5km/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 0.40 s. S wave: 6 measurements, root-mean-square deviation 0.14 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 | |||||
| GESGesves | 10.8 | 136 | 11:48:49.65+1.87 s | 11:48:51.23+3.45 s | 1.58 |
| MRDMaredsous | 22.9 | 222 | 11:48:52.14+4.36 s | 11:48:54.97+7.19 s | 2.83 |
| CLAClavier | 23.1 | 100 | 11:48:51.71+3.93 s | 11:48:54.87+7.09 s | 3.16 |
| RCHRochefort | 37.7 | 152 | 11:48:54.71+6.93 s | – | – |
| DOUDourbes | 48.7 | 215 | 11:48:57.21+9.43 s | 11:49:02.42+14.64 s | 5.21 |
| SNFSeneffe | 49.9 | 277 | 11:48:56.73+8.95 s | 11:49:02.42+14.64 s | 5.69 |
| KLBKalborn | 89.6 | 116 | 11:49:03.03+15.25 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| VKBValkenburg | 72.9 | 51 | 11:49:01.15+13.37 s | 11:49:09.17+21.39 s | 8.02 |