BRAINE-LE-COMTE (BE)
Quarry blast20 June 2023
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 14:29:212023-06-20
- UTC
- 12:29:212023-06-20
Main parameters
| Date and time | 2023-06-20 12:29:21 UTC 2023-06-20 14:29:21 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.569° N, 4.122° E Uncertainty ± 0.9 km |
| Event ID | ROB 19670 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-06-21 23:54:17 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
- 8.4 – 28.6km
- Mean velocity, P wave
- 6.5km/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 0.24 s. S wave: 4 measurements, root-mean-square deviation 0.36 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 | |||||
| RQRRonquières | 8.4 | 60 | 12:29:22.70+1.67 s | 12:29:23.88+2.85 s | 1.18 |
| SKQSteenkerque | 9.4 | 342 | 12:29:23.00+1.97 s | 12:29:24.33+3.30 s | 1.33 |
| BRQBracquegnies | 9.8 | 174 | 12:29:22.76+1.73 s | – | – |
| SNFSeneffe | 13.2 | 119 | 12:29:24.03+3.00 s | 12:29:26.05+5.02 s | 2.02 |
| BLRGBlaregnies | 28.5 | 214 | 12:29:26.11+5.08 s | – | – |
| TGATangissart | 28.6 | 82 | 12:29:25.95+4.92 s | 12:29:29.53+8.50 s | 3.58 |