ASSESSE (BE)
Quarry blast21 March 2019
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:18:272019-03-21
- UTC
- 11:18:272019-03-21
Main parameters
| Date and time | 2019-03-21 11:18:27 UTC 2019-03-21 12:18:27 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.347° N, 4.991° E Uncertainty ± 1.1 km |
| Event ID | ROB 7980 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-03-21 12:36:53 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
- 5
- Epicentral distance
- 8.0 – 39.8km
- Mean velocity, P wave
- 5.8km/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: 5 measurements, root-mean-square deviation 0.12 s. S wave: 5 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)5 stations | |||||
| GESGesves | 8.0 | 58 | 11:18:29.02+1.70 s | 11:18:29.94+2.62 s | 0.92 |
| MRDMaredsous | 16.7 | 252 | 11:18:30.47+3.15 s | 11:18:32.58+5.26 s | 2.11 |
| CLAClavier | 23.5 | 70 | 11:18:31.87+4.55 s | 11:18:35.06+7.74 s | 3.19 |
| RCHRochefort | 27.2 | 142 | 11:18:32.15+4.83 s | 11:18:35.63+8.31 s | 3.48 |
| DOUDourbes | 39.8 | 225 | 11:18:34.44+7.12 s | 11:18:39.83+12.51 s | 5.39 |