ROCHEFORT (BE)
Quarry blast1 September 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:54:232021-09-01
- UTC
- 09:54:232021-09-01
Main parameters
| Date and time | 2021-09-01 09:54:23 UTC 2021-09-01 11:54:23 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.190° N, 5.235° E Uncertainty ± 0.4 km |
| Event ID | ROB 14380 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-02 08:48:29 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
- 3.9 – 63.3km
- Mean velocity, P wave
- 6.1km/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: 6 measurements, root-mean-square deviation 0.16 s. S wave: 5 measurements, root-mean-square deviation 0.23 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 | 3.9 | 188 | 09:54:24.44+0.93 s | 09:54:25.01+1.50 s | 0.57 |
| GESGesves | 24.2 | 334 | 09:54:28.16+4.65 s | 09:54:31.15+7.64 s | 2.99 |
| CLAClavier | 26.0 | 11 | 09:54:28.49+4.98 s | 09:54:31.94+8.43 s | 3.45 |
| DOUDourbes | 46.9 | 257 | 09:54:32.00+8.49 s | 09:54:37.36+13.85 s | 5.36 |
| HOUHouvegnez | 57.9 | 71 | 09:54:33.55+10.04 s | – | – |
| KLBKalborn | 63.3 | 99 | 09:54:34.45+10.94 s | 09:54:42.06+18.55 s | 7.61 |