ROCHEFORT (BE)
Quarry blast20 September 2022
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 13:49:552022-09-20
- UTC
- 11:49:552022-09-20
Main parameters
| Date and time | 2022-09-20 11:49:55 UTC 2022-09-20 13:49:55 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.107° N, 5.156° E Uncertainty ± 2.9 km |
| Event ID | ROB 17185 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-09-26 13:28:46 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
- 7
- Epicentral distance
- 7.4 – 82.5km
- Mean velocity, P wave
- 5.6km/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: 7 measurements, root-mean-square deviation 0.34 s. S wave: 6 measurements, root-mean-square deviation 0.80 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 | |||||
| RCHRochefort | 7.4 | 44 | 11:49:56.67+1.39 s | 11:49:58.01+2.73 s | 1.34 |
| GESGesves | 31.3 | 351 | 11:50:01.20+5.92 s | 11:50:04.80+9.52 s | 3.60 |
| MRDMaredsous | 35.1 | 308 | 11:50:01.59+6.31 s | 11:50:06.61+11.33 s | 5.02 |
| CLAClavier | 36.2 | 17 | 11:50:01.60+6.32 s | 11:50:04.39+9.11 s | 2.79 |
| DOUDourbes | 40.1 | 268 | 11:50:02.19+6.91 s | 11:50:07.35+12.07 s | 5.16 |
| MRGMont Rigi | 79.4 | 55 | 11:50:09.78+14.50 s | 11:50:17.74+22.46 s | 7.96 |
| MEMSMembach | 82.5 | 47 | 11:50:10.84+15.56 s | – | – |