ROCHEFORT (BE)
Quarry blast23 April 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 12:07:442021-04-23
- UTC
- 10:07:442021-04-23
Main parameters
| Date and time | 2021-04-23 10:07:44 UTC 2021-04-23 12:07:44 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.188° N, 5.237° E Uncertainty ± 0.6 km |
| Event ID | ROB 13205 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-23 17:56:50 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
- 3.7 – 63.1km
- Mean velocity, P wave
- 5.8km/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 0.20 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 | 3.7 | 191 | 10:07:45.34+0.49 s | 10:07:46.23+1.38 s | 0.89 |
| GESGesves | 24.4 | 334 | 10:07:49.35+4.50 s | – | – |
| CLAClavier | 26.2 | 10 | 10:07:49.62+4.77 s | – | – |
| DOUDourbes | 47.0 | 258 | 10:07:53.14+8.29 s | 10:07:59.26+14.41 s | 6.12 |
| KLBKalborn | 63.1 | 99 | 10:07:55.57+10.72 s | 10:08:04.07+19.22 s | 8.50 |
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