LA ROCHE-EN-ARDENNE (BE)
Quarry blast30 July 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:45:062021-07-30
- UTC
- 10:45:062021-07-30
Main parameters
| Date and time | 2021-07-30 10:45:06 UTC 2021-07-30 12:45:06 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.191° N, 5.591° E Uncertainty ± 0.6 km |
| Event ID | ROB 14055 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-30 16:07:28 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
- 26.3 – 55.3km
- Mean velocity, P wave
- 5.9km/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: 6 measurements, root-mean-square deviation 0.09 s. S wave: 5 measurements, root-mean-square deviation 0.29 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 | |||||
| RCHRochefort | 26.3 | 262 | 10:45:11.21+4.75 s | 10:45:14.63+8.17 s | 3.42 |
| CLAClavier | 32.7 | 321 | 10:45:12.28+5.82 s | 10:45:16.68+10.22 s | 4.40 |
| HOUHouvegnez | 34.7 | 58 | 10:45:12.55+6.09 s | – | – |
| KLBKalborn | 38.4 | 105 | 10:45:13.41+6.95 s | 10:45:18.05+11.59 s | 4.64 |
| GESGesves | 41.9 | 301 | 10:45:13.99+7.53 s | 10:45:19.87+13.41 s | 5.88 |
| MEMHMembach | 55.3 | 32 | 10:45:16.17+9.71 s | 10:45:23.06+16.60 s | 6.89 |