ROCHEFORT (BE)
Quarry blast22 June 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 11:41:212021-06-22
- UTC
- 09:41:212021-06-22
Main parameters
| Date and time | 2021-06-22 09:41:21 UTC 2021-06-22 11:41:21 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.177° N, 5.247° E Uncertainty ± 0.4 km |
| Event ID | ROB 13750 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 10:42:36 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
- 5
- Epicentral distance
- 2.8 – 62.2km
- 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: 5 measurements, root-mean-square deviation 0.13 s. S wave: 4 measurements, root-mean-square deviation 0.19 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)5 stations | |||||
| RCHRochefort | 2.8 | 210 | 09:41:22.26+0.43 s | 09:41:22.91+1.08 s | 0.65 |
| GESGesves | 25.8 | 334 | 09:41:26.59+4.76 s | 09:41:30.10+8.27 s | 3.51 |
| CLAClavier | 27.2 | 8 | 09:41:26.68+4.85 s | 09:41:30.43+8.60 s | 3.75 |
| DOUDourbes | 47.5 | 259 | 09:41:30.24+8.41 s | 09:41:36.21+14.38 s | 5.97 |
| KLBKalborn | 62.2 | 98 | 09:41:32.71+10.88 s | – | – |