LA ROCHE-EN-ARDENNE (BE)
Quarry blast24 February 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 17:39:212021-02-24
- UTC
- 16:39:212021-02-24
Main parameters
| Date and time | 2021-02-24 16:39:21 UTC 2021-02-24 17:39:21 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.195° N, 5.596° E Uncertainty ± 0.7 km |
| Event ID | ROB 12545 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-26 21:22:45 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
- 26.7 – 72.4km
- 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: 8 measurements, root-mean-square deviation 0.18 s. S wave: 7 measurements, root-mean-square deviation 0.28 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 | |||||
| RCHRochefort | 26.7 | 260 | 16:39:26.40+4.60 s | 16:39:29.95+8.15 s | 3.55 |
| CLAClavier | 32.5 | 320 | 16:39:27.49+5.69 s | 16:39:32.08+10.28 s | 4.59 |
| HOUHouvegnez | 34.1 | 59 | 16:39:27.69+5.89 s | – | – |
| KLBKalborn | 38.2 | 106 | 16:39:28.64+6.84 s | 16:39:33.70+11.90 s | 5.06 |
| GESGesves | 41.9 | 300 | 16:39:29.26+7.46 s | 16:39:35.08+13.28 s | 5.82 |
| VIAVianden | 52.2 | 123 | 16:39:31.27+9.47 s | 16:39:37.66+15.86 s | 6.39 |
| MEMHMembach | 54.6 | 32 | 16:39:31.40+9.60 s | 16:39:38.21+16.41 s | 6.81 |
| DOUDourbes | 72.4 | 262 | 16:39:34.14+12.34 s | 16:39:44.42+22.62 s | 10.28 |