NAMUR (BE)
Quarry blast18 February 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:26:152021-02-18
- UTC
- 13:26:152021-02-18
Main parameters
| Date and time | 2021-02-18 13:26:15 UTC 2021-02-18 14:26:15 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.517° N, 4.928° E Uncertainty ± 2.0 km |
| Event ID | ROB 12500 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-25 22:54:36 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
- 8
- Epicentral distance
- 18.5 – 96.0km
- Mean velocity, P wave
- 5.6km/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 0.66 s. S wave: 8 measurements, root-mean-square deviation 0.72 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 | 18.5 | 142 | 13:26:18.03+2.57 s | 13:26:19.93+4.47 s | 1.90 |
| MRDMaredsous | 26.5 | 206 | 13:26:20.36+4.90 s | 13:26:24.34+8.88 s | 3.98 |
| CLAClavier | 28.7 | 112 | 13:26:19.84+4.38 s | 13:26:23.47+8.01 s | 3.63 |
| TGATangissart | 30.4 | 289 | 13:26:21.42+5.96 s | 13:26:24.04+8.58 s | 2.62 |
| RCHRochefort | 45.5 | 152 | 13:26:24.68+9.22 s | 13:26:29.37+13.91 s | 4.69 |
| DOUDourbes | 52.6 | 207 | 13:26:24.96+9.50 s | 13:26:31.54+16.08 s | 6.58 |
| HOUHouvegnez | 78.6 | 103 | 13:26:29.82+14.36 s | 13:26:39.35+23.89 s | 9.53 |
| KLBKalborn | 96.0 | 118 | 13:26:31.74+16.28 s | 13:26:42.97+27.51 s | 11.23 |