SOIGNIES (BE)
Quarry blast1 October 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:08:062021-10-01
- UTC
- 12:08:062021-10-01
Main parameters
| Date and time | 2021-10-01 12:08:06 UTC 2021-10-01 14:08:06 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.575° N, 4.098° E Uncertainty ± 1.0 km |
| Event ID | ROB 14565 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-05 10:26:05 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 – 64.0km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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 0.18 s. S wave: 5 measurements, root-mean-square deviation 0.32 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 | |||||
| SKQSteenkerque | 8.4 | 351 | 12:08:08.06+1.61 s | 12:08:09.48+3.03 s | 1.42 |
| RQRRonquières | 9.6 | 69 | 12:08:08.32+1.87 s | 12:08:09.91+3.46 s | 1.59 |
| BRQBracquegnies | 10.8 | 166 | 12:08:08.31+1.86 s | – | – |
| SNFSeneffe | 15.0 | 118 | 12:08:09.17+2.72 s | 12:08:11.61+5.16 s | 2.44 |
| TGATangissart | 30.2 | 83 | 12:08:11.66+5.21 s | 12:08:15.34+8.89 s | 3.68 |
| DOUDourbes | 64.0 | 146 | 12:08:17.95+11.50 s | 12:08:25.95+19.50 s | 8.00 |