SOIGNIES (BE)
Quarry blast8 July 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 14:04:212021-07-08
- UTC
- 12:04:212021-07-08
Main parameters
| Date and time | 2021-07-08 12:04:21 UTC 2021-07-08 14:04:21 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.574° N, 4.061° E Uncertainty ± 0.9 km |
| Event ID | ROB 13925 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-09 11:06:17 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
- 5
- Epicentral distance
- 8.5 – 32.8km
- Mean velocity, P wave
- 6.0km/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 0.05 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 | |||||
| SKQSteenkerque | 8.5 | 9 | 12:04:23.33+1.71 s | 12:04:24.52+2.90 s | 1.19 |
| BRQBracquegnies | 11.6 | 153 | 12:04:23.93+2.31 s | – | – |
| RQRRonquières | 12.2 | 73 | 12:04:24.00+2.38 s | – | – |
| SNFSeneffe | 17.3 | 114 | 12:04:24.96+3.34 s | – | – |
| TGATangissart | 32.8 | 84 | 12:04:27.42+5.80 s | 12:04:31.52+9.90 s | 4.10 |
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