BRAINE-LE-COMTE (BE)
Quarry blast16 September 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 13:33:162021-09-16
- UTC
- 11:33:162021-09-16
Main parameters
| Date and time | 2021-09-16 11:33:16 UTC 2021-09-16 13:33:16 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.567° N, 4.125° E Uncertainty ± 0.6 km |
| Event ID | ROB 14425 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-16 15:45:48 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
- 8.3 – 28.4km
- Mean velocity, P wave
- 6.7km/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 0.03 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 | |||||
| RQRRonquières | 8.3 | 58 | 11:33:18.02+1.74 s | – | – |
| BRQBracquegnies | 9.6 | 175 | 11:33:18.19+1.91 s | – | – |
| SKQSteenkerque | 9.7 | 341 | 11:33:18.28+2.00 s | 11:33:19.53+3.25 s | 1.25 |
| SNFSeneffe | 12.9 | 119 | 11:33:18.66+2.38 s | 11:33:20.72+4.44 s | 2.06 |
| TGATangissart | 28.4 | 81 | 11:33:21.05+4.77 s | – | – |
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