ROCHEFORT (BE)
Quarry blast23 June 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:04:242021-06-23
- UTC
- 10:04:242021-06-23
Main parameters
| Date and time | 2021-06-23 10:04:24 UTC 2021-06-23 12:04:24 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.167° N, 5.207° E Uncertainty ± 2.0 km |
| Event ID | ROB 13765 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 10:47:20 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
- 9
- Epicentral distance
- 2.0 – 80.5km
- Mean velocity, P wave
- 5.8km/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: 9 measurements, root-mean-square deviation 0.54 s. S wave: 6 measurements, root-mean-square deviation 0.64 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)9 stations | |||||
| RCHRochefort | 2.0 | 133 | 10:04:24.23+0.13 s | 10:04:25.17+1.07 s | 0.94 |
| GESGesves | 25.7 | 341 | 10:04:28.55+4.45 s | 10:04:32.56+8.46 s | 4.01 |
| CLAClavier | 28.8 | 14 | 10:04:28.87+4.77 s | 10:04:33.12+9.02 s | 4.25 |
| MRDMaredsous | 34.7 | 296 | 10:04:29.29+5.19 s | 10:04:34.03+9.93 s | 4.74 |
| DOUDourbes | 44.5 | 260 | 10:04:32.30+8.20 s | 10:04:37.77+13.67 s | 5.47 |
| KLBKalborn | 64.9 | 96 | 10:04:34.59+10.49 s | 10:04:42.11+18.01 s | 7.52 |
| MEMHMembach | 75.3 | 49 | 10:04:37.70+13.60 s | – | – |
| MEMSMembach | 75.3 | 49 | 10:04:37.72+13.62 s | – | – |
| TNLTernell | 80.5 | 54 | 10:04:38.47+14.37 s | – | – |