SOIGNIES (BE)
Quarry blast4 February 2020
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 14:03:382020-02-04
- UTC
- 13:03:382020-02-04
Main parameters
| Date and time | 2020-02-04 13:03:38 UTC 2020-02-04 14:03:38 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.584° N, 4.079° E Uncertainty ± 0.9 km |
| Event ID | ROB 9240 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-04 14:40:06 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
- 15
- Epicentral distance
- 7.2 – 154.2km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.4km/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: 9 measurements, root-mean-square deviation 0.20 s. S wave: 4 measurements, root-mean-square deviation 0.41 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)14 stations | |||||
| SKQSteenkerque | 7.2 | 0 | 13:03:39.65+1.33 s | 13:03:40.94+2.62 s | 1.29 |
| RQRRonquières | 10.6 | 77 | 13:03:40.29+1.97 s | 13:03:42.10+3.78 s | 1.81 |
| BRQBracquegnies | 12.2 | 161 | 13:03:40.11+1.79 s | – | – |
| TGATangissart | 31.4 | 86 | 13:03:43.58+5.26 s | 13:03:47.27+8.95 s | 3.69 |
| MRDMaredsous | 58.1 | 122 | 13:03:48.25+9.93 s | – | – |
| DOUDourbes | 65.6 | 146 | 13:03:49.93+11.61 s | 13:03:58.18+19.86 s | 8.25 |
| GESGesves | 74.9 | 107 | 13:03:51.36+13.04 s | – | – |
| CLAClavier | 88.7 | 101 | 13:03:53.42+15.10 s | – | – |
| RCHRochefort | 94.6 | 120 | 13:03:54.52+16.20 s | – | – |
| MEMSMembach | 136.7 | 88 | 13:04:01.15+22.83 s | – | – |
| MEMHMembach | 136.7 | 88 | 13:04:01.19+22.87 s | – | – |
| HOUHouvegnez | 139.1 | 100 | 13:04:02.01+23.69 s | – | – |
| MRGMont Rigi | 141.7 | 93 | 13:04:02.04+23.72 s | – | – |
| KLBKalborn | 154.2 | 110 | 13:04:04.77+26.45 s | 13:04:23.59+45.27 s | 18.82 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 132.5 | 81 | 13:04:01.16+22.84 s | – | – |